Annotation of html5/spec-author-view/the-button-element.html, revision 1.21
1.1 mike 1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
2: <!DOCTYPE html>
1.20 mike 3: <!-- when publishing, change bits marked ZZZ --><html lang="en-US-x-Hixie" class="split chapter"><head><title>4.10.8 The button element — HTML5 (Author Edition)</title><script src="link-fixup.js"></script><link href="whatwg.css" rel="stylesheet"><style type="text/css">
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64: h2 { page-break-before: always; }
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169:
1.14 mike 170: body.dfnEnabled dfn { cursor: pointer; }
171: .dfnPanel {
172: display: inline;
173: position: absolute;
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175: height: auto;
176: width: auto;
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180: color: black;
181: border: outset 0.2em;
182: }
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186: .dfnPanel * + p { margin-top: 0.25em; }
187: .dfnPanel li { list-style-position: inside; }
188:
1.1 mike 189: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
190: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
191: #configUI p label { display: block; }
192: #configUI #updateUI, #configUI .loginUI { text-align: center; }
193: #configUI input[type=button] { display: block; margin: auto; }
194: </style><style type="text/css">
195:
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225:
226: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
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229: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
230: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
231: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
232: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
233: .apple-table-examples td { text-align: right; vertical-align: top; }
234: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
1.9 mike 235: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
236: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
237: .apple-table-examples sup { line-height: 0; }
238:
1.11 mike 239: .details-example img { vertical-align: top; }
240:
241: </style><link href="data:text/css," id="complete" rel="stylesheet" title="Complete specification"><link href="data:text/css,.impl%20%7B%20display:%20none;%20%7D" id="author" rel="alternate stylesheet" title="Author documentation only"><link href="data:text/css,.impl%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation requirements"><script type="text/javascript">
1.9 mike 242: function getCookie(name) {
243: var params = location.search.substr(1).split("&");
244: for (var index = 0; index < params.length; index++) {
245: if (params[index] == name)
246: return "1";
247: var data = params[index].split("=");
248: if (data[0] == name)
249: return unescape(data[1]);
250: }
251: var cookies = document.cookie.split("; ");
252: for (var index = 0; index < cookies.length; index++) {
253: var data = cookies[index].split("=");
254: if (data[0] == name)
255: return unescape(data[1]);
256: }
257: return null;
258: }
259: function load(script) {
260: var e = document.createElement('script');
261: e.setAttribute('src', 'http://www.whatwg.org/specs/web-apps/current-work/' + script + '?' + encodeURIComponent(location) + '&' + encodeURIComponent(document.referrer));
262: document.body.appendChild(e);
263: }
264: function init() {
265: if (location.search == '?slow-browser')
266: return;
267: var configUI = document.createElement('div');
268: configUI.id = 'configUI';
269: document.body.appendChild(configUI);
270: // load('reviewer.js'); // would need cross-site XHR
271: if (document.getElementById('head'))
272: load('toc.js');
273:
274: // load('updater.js'); // would need cross-site XHR
1.11 mike 275: load('dfn.js'); // doesn't support split-out specs, but, oh well.
1.9 mike 276: // load('status.js'); // would need cross-site XHR
277: if (getCookie('profile') == '1')
278: document.getElementsByTagName('h2')[0].textContent += '; load: ' + (new Date() - loadTimer) + 'ms';
279: fixBrokenLink();
280: }
1.20 mike 281: </script><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css"><link href="common-input-element-attributes.html" title="4.10.7.2 Common input element attributes" rel="prev">
1.9 mike 282: <link href="Overview.html#contents" title="Table of contents" rel="index">
1.20 mike 283: <link href="association-of-controls-and-forms.html" title="4.10.18 Association of controls and forms" rel="next">
1.9 mike 284: </head><body onload="fixBrokenLink(); init()"><div class="head" id="head">
285: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
286: <h1>HTML5 (Author Edition)</h1>
287: </div><div>
1.20 mike 288: <a href="common-input-element-attributes.html">← 4.10.7.2 Common input element attributes</a> –
1.9 mike 289: <a href="Overview.html#contents">Table of contents</a> –
1.20 mike 290: <a href="association-of-controls-and-forms.html">4.10.18 Association of controls and forms →</a>
291: <ol class="toc"><li><ol><li><ol><li><a href="the-button-element.html#the-button-element"><span class="secno">4.10.8 </span>The <code>button</code> element</a></li><li><a href="the-button-element.html#the-select-element"><span class="secno">4.10.9 </span>The <code>select</code> element</a></li><li><a href="the-button-element.html#the-datalist-element"><span class="secno">4.10.10 </span>The <code>datalist</code> element</a></li><li><a href="the-button-element.html#the-optgroup-element"><span class="secno">4.10.11 </span>The <code>optgroup</code> element</a></li><li><a href="the-button-element.html#the-option-element"><span class="secno">4.10.12 </span>The <code>option</code> element</a></li><li><a href="the-button-element.html#the-textarea-element"><span class="secno">4.10.13 </span>The <code>textarea</code> element</a></li><li><a href="the-button-element.html#the-keygen-element"><span class="secno">4.10.14 </span>The <code>keygen</code> element</a></li><li><a href="the-button-element.html#the-output-element"><span class="secno">4.10.15 </span>The <code>output</code> element</a></li><li><a href="the-button-element.html#the-progress-element"><span class="secno">4.10.16 </span>The <code>progress</code> element</a></li><li><a href="the-button-element.html#the-meter-element"><span class="secno">4.10.17 </span>The <code>meter</code> element</a></li></ol></li></ol></li></ol></div>
1.9 mike 292:
1.20 mike 293: <h4 id="the-button-element"><span class="secno">4.10.8 </span>The <dfn><code>button</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 294: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
295: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
296: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
297: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, and <a href="forms.html#category-submit" title="category-submit">submittable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
298: <dt>Contexts in which this element may be used:</dt>
299: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
300: <dt>Content model:</dt>
301: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>, but there must be no <a href="content-models.html#interactive-content">interactive content</a> descendant.</dd>
302: <dt>Content attributes:</dt>
303: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
304: <dd><code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code></dd>
305: <dd><code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code></dd>
306: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
307: <dd><code title="attr-fs-formaction"><a href="association-of-controls-and-forms.html#attr-fs-formaction">formaction</a></code></dd>
308: <dd><code title="attr-fs-formenctype"><a href="association-of-controls-and-forms.html#attr-fs-formenctype">formenctype</a></code></dd>
309: <dd><code title="attr-fs-formmethod"><a href="association-of-controls-and-forms.html#attr-fs-formmethod">formmethod</a></code></dd>
310: <dd><code title="attr-fs-formnovalidate"><a href="association-of-controls-and-forms.html#attr-fs-formnovalidate">formnovalidate</a></code></dd>
311: <dd><code title="attr-fs-formtarget"><a href="association-of-controls-and-forms.html#attr-fs-formtarget">formtarget</a></code></dd>
312: <dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
313: <dd><code title="attr-button-type"><a href="#attr-button-type">type</a></code></dd>
314: <dd><code title="attr-button-value"><a href="#attr-button-value">value</a></code></dd>
315: <dt>DOM interface:</dt>
316: <dd>
317: <pre class="idl">interface <dfn id="htmlbuttonelement">HTMLButtonElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
318: attribute boolean <a href="#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
319: attribute boolean <a href="#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
320: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
321: attribute DOMString <a href="#dom-fs-formaction" title="dom-fs-formAction">formAction</a>;
322: attribute DOMString <a href="#dom-fs-formenctype" title="dom-fs-formEnctype">formEnctype</a>;
323: attribute DOMString <a href="#dom-fs-formmethod" title="dom-fs-formMethod">formMethod</a>;
324: attribute DOMString <a href="#dom-fs-formnovalidate" title="dom-fs-formNoValidate">formNoValidate</a>;
325: attribute DOMString <a href="#dom-fs-formtarget" title="dom-fs-formTarget">formTarget</a>;
326: attribute DOMString <a href="#dom-fe-name" title="dom-fe-name">name</a>;
327: attribute DOMString <a href="#dom-button-type" title="dom-button-type">type</a>;
328: attribute DOMString <a href="#dom-button-value" title="dom-button-value">value</a>;
329:
330: readonly attribute boolean <a href="#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
331: readonly attribute <a href="#validitystate">ValidityState</a> <a href="#dom-cva-validity" title="dom-cva-validity">validity</a>;
332: readonly attribute DOMString <a href="#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
333: boolean <a href="#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
334: void <a href="#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
335:
1.19 mike 336: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.9 mike 337: };</pre>
338: </dd>
339: </dl><p>The <code><a href="#the-button-element">button</a></code> element <a href="#represents">represents</a> a
340: button. </p><p>The element is a <a href="forms.html#concept-button" title="concept-button">button</a>.</p><p>The <dfn id="attr-button-type" title="attr-button-type"><code>type</code></dfn>
341: attribute controls the behavior of the button when it is activated.
342: It is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The following table
343: lists the keywords and states for the attribute — the keywords
344: in the left column map to the states in the cell in the second
345: column on the same row as the keyword.</p><table><thead><tr><th> Keyword
346: </th><th> State
347: </th><th> Brief description
348: </th></tr></thead><tbody><tr><td><dfn id="attr-button-type-submit" title="attr-button-type-submit"><code>submit</code></dfn>
349: </td><td><a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
350: </td><td>Submits the form.
351: </td></tr><tr><td><dfn id="attr-button-type-reset" title="attr-button-type-reset"><code>reset</code></dfn>
352: </td><td><a href="#attr-button-type-reset-state" title="attr-button-type-reset-state">Reset Button</a>
353: </td><td>Resets the form.
354: </td></tr><tr><td><dfn id="attr-button-type-button" title="attr-button-type-button"><code>button</code></dfn>
355: </td><td><a href="#attr-button-type-button-state" title="attr-button-type-button-state">Button</a>
356: </td><td>Does nothing.
357: </td></tr></tbody></table><p>The <i>missing value default</i> is the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
358: state.</p><p>If the <code title="attr-button-type"><a href="#attr-button-type">type</a></code> attribute is in
359: the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
360: state, the element is specifically a <a href="forms.html#concept-submit-button" title="concept-submit-button">submit button</a>.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
361: explicitly associate the <code><a href="#the-button-element">button</a></code> element with its
362: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
363: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code> attribute is used to make
364: the control non-interactive and to prevent its value from being
365: submitted. The <code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code>
366: attribute controls focus. The <code title="attr-fs-formaction"><a href="association-of-controls-and-forms.html#attr-fs-formaction">formaction</a></code>, <code title="attr-fs-formenctype"><a href="association-of-controls-and-forms.html#attr-fs-formenctype">formenctype</a></code>, <code title="attr-fs-formmethod"><a href="association-of-controls-and-forms.html#attr-fs-formmethod">formmethod</a></code>, <code title="attr-fs-formnovalidate"><a href="association-of-controls-and-forms.html#attr-fs-formnovalidate">formnovalidate</a></code>, and <code title="attr-fs-formtarget"><a href="association-of-controls-and-forms.html#attr-fs-formtarget">formtarget</a></code> attributes are
367: <a href="association-of-controls-and-forms.html#attributes-for-form-submission">attributes for form submission</a>.</p><p class="note">The <code title="attr-fs-formnovalidate"><a href="association-of-controls-and-forms.html#attr-fs-formnovalidate">formnovalidate</a></code> attribute can
368: be used to make submit buttons that do not trigger the constraint
1.15 mike 369: validation.</p><p>The <code title="attr-fs-formaction"><a href="association-of-controls-and-forms.html#attr-fs-formaction">formaction</a></code>, <code title="attr-fs-formenctype"><a href="association-of-controls-and-forms.html#attr-fs-formenctype">formenctype</a></code>, <code title="attr-fs-formmethod"><a href="association-of-controls-and-forms.html#attr-fs-formmethod">formmethod</a></code>, <code title="attr-fs-formnovalidate"><a href="association-of-controls-and-forms.html#attr-fs-formnovalidate">formnovalidate</a></code>, and <code title="attr-fs-formtarget"><a href="association-of-controls-and-forms.html#attr-fs-formtarget">formtarget</a></code> must not be specified
370: if the element's <code title="attr-button-type"><a href="#attr-button-type">type</a></code>
371: attribute is not in the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
372: state.</p><p>The <dfn id="attr-button-value" title="attr-button-value"><code>value</code></dfn>
1.9 mike 373: attribute gives the element's value for the purposes of form
1.10 mike 374: submission. The element's <a href="#concept-fe-value" title="concept-fe-value">value</a> is the value of the element's
375: <code title="attr-button-value"><a href="#attr-button-value">value</a></code> attribute, if there is
376: one, or the empty string otherwise.</p><p class="note">A button (and its value) is only included in the
1.9 mike 377: form submission if the button itself was used to initiate the form
378: submission.</p><div class="example">
379:
380: <p>The following button is labeled "Show hint" and pops up a dialog
381: box when activated:</p>
382:
383: <pre><button type=button
384: onclick="alert('This 15-20 minute piece was composed by George Gershwin.')">
385: Show hint
386: </button></pre>
387:
1.20 mike 388: </div><h4 id="the-select-element"><span class="secno">4.10.9 </span>The <dfn><code>select</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 389: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
390: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
391: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
392: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, <a href="forms.html#category-submit" title="category-submit">submittable</a>, and <a href="forms.html#category-reset" title="category-reset">resettable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
393: <dt>Contexts in which this element may be used:</dt>
394: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
395: <dt>Content model:</dt>
396: <dd>Zero or more <code><a href="#the-option-element">option</a></code> or <code><a href="#the-optgroup-element">optgroup</a></code> elements.</dd>
397: <dt>Content attributes:</dt>
398: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
399: <dd><code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code></dd>
400: <dd><code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code></dd>
401: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
402: <dd><code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code></dd>
403: <dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
404: <dd><code title="attr-select-size"><a href="#attr-select-size">size</a></code></dd>
405: <dt>DOM interface:</dt>
406: <dd>
407: <pre class="idl">interface <dfn id="htmlselectelement">HTMLSelectElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
408: attribute boolean <a href="#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
409: attribute boolean <a href="#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
410: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
411: attribute boolean <a href="#dom-select-multiple" title="dom-select-multiple">multiple</a>;
412: attribute DOMString <a href="#dom-fe-name" title="dom-fe-name">name</a>;
413: attribute unsigned long <a href="#dom-select-size" title="dom-select-size">size</a>;
414:
415: readonly attribute DOMString <a href="#dom-select-type" title="dom-select-type">type</a>;
416:
417: readonly attribute <a href="urls.html#htmloptionscollection">HTMLOptionsCollection</a> <a href="#dom-select-options" title="dom-select-options">options</a>;
418: attribute unsigned long <a href="#dom-select-length" title="dom-select-length">length</a>;
419: caller getter any <a href="#dom-select-item" title="dom-select-item">item</a>(in unsigned long index);
420: caller getter any <a href="#dom-select-nameditem" title="dom-select-namedItem">namedItem</a>(in DOMString name);
421: void <a href="#dom-select-add" title="dom-select-add">add</a>(in <a href="elements.html#htmlelement">HTMLElement</a> element, in optional <a href="elements.html#htmlelement">HTMLElement</a> before);
422: void <a href="#dom-select-add" title="dom-select-add">add</a>(in <a href="elements.html#htmlelement">HTMLElement</a> element, in long before);
423: void <a href="#dom-select-remove" title="dom-select-remove">remove</a>(in long index);
424:
425: readonly attribute <a href="urls.html#htmlcollection">HTMLCollection</a> <a href="#dom-select-selectedoptions" title="dom-select-selectedOptions">selectedOptions</a>;
426: attribute long <a href="#dom-select-selectedindex" title="dom-select-selectedIndex">selectedIndex</a>;
427: attribute DOMString <a href="#dom-select-value" title="dom-select-value">value</a>;
428:
429: readonly attribute boolean <a href="#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
430: readonly attribute <a href="#validitystate">ValidityState</a> <a href="#dom-cva-validity" title="dom-cva-validity">validity</a>;
431: readonly attribute DOMString <a href="#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
432: boolean <a href="#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
433: void <a href="#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
434:
1.19 mike 435: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.9 mike 436: };</pre>
437: </dd>
438: </dl><!-- Proposals for v2:
439: * <select value=""> as an alternative to <option selected>
440: http://developers.slashdot.org/comments.pl?sid=426306&cid=22142072
1.11 mike 441: <Philip`> http://www.ipiao.com.cn/ does <select size="1" name="to"><script type="text/javascript">City_Default="PEK"</script><SCRIPT language=javascript
1.9 mike 442: src="/js/flightcity.js"></SCRIPT></select> which is the kind of thing that could be much simpler with <select value="PEK">
443: * a way to make the <select> not have a default value at all (ack
444: or to have a "placeholer" like value that doesn't count as a value being selected but shows a prompt until a value is selected
445: * once we can have no default, a way to require="" a value.
446: ack Weston Ruter: http://weston.ruter.net/projects/test-cases/html-select-element/
447: q.v. http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2008-November/017583.html
448: --><p>The <code><a href="#the-select-element">select</a></code> element represents a control for
449: selecting amongst a set of options.</p><p>The <dfn id="attr-select-multiple" title="attr-select-multiple"><code>multiple</code></dfn>
450: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. If the attribute is
451: present, then the <code><a href="#the-select-element">select</a></code> element
452: <a href="#represents">represents</a> a control for selecting zero or more options
453: from the <a href="#concept-select-option-list" title="concept-select-option-list">list of
454: options</a>. If the attribute is absent, then the
455: <code><a href="#the-select-element">select</a></code> element <a href="#represents">represents</a> a control for
456: selecting a single option from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p><p>The <dfn id="concept-select-option-list" title="concept-select-option-list">list of options</dfn>
457: for a <code><a href="#the-select-element">select</a></code> element consists of all the
458: <code><a href="#the-option-element">option</a></code> element children of the <code><a href="#the-select-element">select</a></code>
459: element, and all the <code><a href="#the-option-element">option</a></code> element children of all the
460: <code><a href="#the-optgroup-element">optgroup</a></code> element children of the <code><a href="#the-select-element">select</a></code>
461: element, in <a href="infrastructure.html#tree-order">tree order</a>.</p><p>The <dfn id="attr-select-size" title="attr-select-size"><code>size</code></dfn>
462: attribute gives the number of options to show to the user. The <code title="attr-input-size"><a href="common-input-element-attributes.html#attr-input-size">size</a></code> attribute, if specified, must
463: have a value that is a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a>
464: greater than zero. If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute is present,
465: then the <code title="attr-input-size"><a href="common-input-element-attributes.html#attr-input-size">size</a></code> attribute's
466: default value is 4. If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute is absent,
467: then the <code title="attr-input-size"><a href="common-input-element-attributes.html#attr-input-size">size</a></code> attribute's
468: default value is 1.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
469: explicitly associate the <code><a href="#the-select-element">select</a></code> element with its
470: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
471: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code> attribute is used to make
472: the control non-interactive and to prevent its value from being
473: submitted. The <code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code>
474: attribute controls focus.</p><dl class="domintro"><dt><var title="">select</var> . <code title="dom-select-type"><a href="#dom-select-type">type</a></code></dt>
475:
476: <dd>
477:
478: <p>Returns "<code title="">select-multiple</code>" if the element
479: has a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
480: attribute, and "<code title="">select-one</code>"
481: otherwise.</p>
482:
483: </dd>
484:
485: <dt><var title="">select</var> . <code title="dom-select-options"><a href="#dom-select-options">options</a></code></dt>
486:
487: <dd>
488:
489: <p>Returns an <code><a href="urls.html#htmloptionscollection">HTMLOptionsCollection</a></code> of the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
490:
491: </dd>
492:
493: <dt><var title="">select</var> . <code title="dom-select-length"><a href="#dom-select-length">length</a></code> [ = <var title="">value</var> ]</dt>
494: <dd>
495: <p>Returns the number of elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
496: <p>When set to a smaller number, truncates the number of <code><a href="#the-option-element">option</a></code> elements in the <code><a href="#the-select-element">select</a></code>.</p>
497: <p>When set to a greater number, adds new blank <code><a href="#the-option-element">option</a></code> elements to the <code><a href="#the-select-element">select</a></code>.</p>
498: </dd>
499:
500: <dt><var title="">element</var> = <var title="">select</var> . <code title="dom-select-item"><a href="#dom-select-item">item</a></code>(<var title="">index</var>)</dt>
501: <dt><var title="">select</var>[<var title="">index</var>]</dt>
502: <dt><var title="">select</var>(<var title="">index</var>)</dt>
503: <dd>
504: <p>Returns the item with index <var title="">index</var> from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>. The items are sorted in <a href="infrastructure.html#tree-order">tree order</a>.</p>
505: <p>Returns null if <var title="">index</var> is out of range.</p>
506: </dd>
507:
508: <dt><var title="">element</var> = <var title="">select</var> . <code title="dom-select-item"><a href="#dom-select-item">namedItem</a></code>(<var title="">name</var>)</dt>
509: <dt><var title="">select</var>[<var title="">name</var>]</dt>
510: <dt><var title="">select</var>(<var title="">name</var>)</dt>
511: <dd>
512: <p>Returns the item with ID or <code title="attr-option-name">name</code> <var title="">name</var> from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
1.19 mike 513: <p>If there are multiple matching items, then a <code><a href="#nodelist">NodeList</a></code> object containing all those elements is returned.</p>
1.9 mike 514: <p>Returns null if no element with that ID could be found.</p>
515: </dd>
516:
517: <dt><var title="">select</var> . <code title="dom-select-add"><a href="#dom-select-add">add</a></code>(<var title="">element</var> [, <var title="">before</var> ])</dt>
518: <dd>
519: <p>Inserts <var title="">element</var> before the node given by <var title="">before</var>.</p>
520: <p>The <var title="">before</var> argument can be a number, in
521: which case <var title="">element</var> is inserted before the item
522: with that number, or an element from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, in
523: which case <var title="">element</var> is inserted before that
524: element.</p>
525: <p>If <var title="">before</var> is omitted, null, or a number out
526: of range, then <var title="">element</var> will be added at the
527: end of the list.</p>
528: <p>This method will throw a <code><a href="urls.html#hierarchy_request_err">HIERARCHY_REQUEST_ERR</a></code>
529: exception if <var title="">element</var> is an ancestor of the
530: element into which it is to be inserted. If <var title="">element</var> is not an <code><a href="#the-option-element">option</a></code> or
531: <code><a href="#the-optgroup-element">optgroup</a></code> element, then the method does nothing.</p>
532: </dd>
533:
534: <dt><var title="">select</var> . <code title="dom-select-selectedOptions"><a href="#dom-select-selectedoptions">selectedOptions</a></code></dt>
535:
536: <dd>
537:
538: <p>Returns an <code><a href="urls.html#htmlcollection">HTMLCollection</a></code> of the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that are
539: selected.</p>
540:
541: </dd>
542:
543: <dt><var title="">select</var> . <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> [ = <var title="">value</var> ]</dt>
544:
545: <dd>
546:
547: <p>Returns the index of the first selected item, if any, or
548: −1 if there is no selected item.</p>
549:
550: <p>Can be set, to change the selection.</p>
551:
552: </dd>
553:
554: <dt><var title="">select</var> . <code title="dom-select-value"><a href="#dom-select-value">value</a></code> [ = <var title="">value</var> ]</dt>
555:
556: <dd>
557:
558: <p>Returns the <a href="#concept-fe-value" title="concept-fe-value">value</a> of the
559: first selected item, if any, or the empty string if there is no
560: selected item.</p>
561:
562: <p>Can be set, to change the selection.</p>
563:
564: </dd>
565:
566: </dl><div class="example">
567:
568: <p>The following example shows how a <code><a href="#the-select-element">select</a></code> element
569: can be used to offer the user with a set of options from which the
570: user can select a single option. The default option is
571: preselected.</p>
572:
573: <pre><p>
574: <label for="unittype">Select unit type:</label>
575: <select id="unittype" name="unittype">
576: <option value="1"> Miner </option>
577: <option value="2"> Puffer </option>
578: <option value="3" selected> Snipey </option>
579: <option value="4"> Max </option>
580: <option value="5"> Firebot </option>
581: </select>
582: </p></pre>
583:
584: </div><div class="example">
585:
586: <p>Here, the user is offered a set of options from which he can
587: select any number. By default, all five options are selected.</p>
588:
589: <pre><p>
590: <label for="allowedunits">Select unit types to enable on this map:</label>
591: <select id="allowedunits" name="allowedunits" multiple>
592: <option value="1" selected> Miner </option>
593: <option value="2" selected> Puffer </option>
594: <option value="3" selected> Snipey </option>
595: <option value="4" selected> Max </option>
596: <option value="5" selected> Firebot </option>
597: </select>
598: </p></pre>
599:
1.20 mike 600: </div><h4 id="the-datalist-element"><span class="secno">4.10.10 </span>The <dfn><code>datalist</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 601: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
602: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
603: <dt>Contexts in which this element may be used:</dt>
604: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
605: <dt>Content model:</dt>
606: <dd>Either: <a href="content-models.html#phrasing-content">phrasing content</a>.</dd>
607: <dd>Or: Zero or more <code><a href="#the-option-element">option</a></code> elements.</dd>
608: <dt>Content attributes:</dt>
609: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
610: <dt>DOM interface:</dt>
611: <dd>
612: <pre class="idl">interface <dfn id="htmldatalistelement">HTMLDataListElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
613: readonly attribute <a href="urls.html#htmlcollection">HTMLCollection</a> <a href="#dom-datalist-options" title="dom-datalist-options">options</a>;
614: };</pre>
615: </dd>
616: </dl><p>The <code><a href="#the-datalist-element">datalist</a></code> element represents a set of
617: <code><a href="#the-option-element">option</a></code> elements that represent predefined options for
618: other controls. The contents of the element represents fallback
619: content for legacy user agents, intermixed with <code><a href="#the-option-element">option</a></code>
620: elements that represent the predefined options. In the rendering,
621: the <code><a href="#the-datalist-element">datalist</a></code> element <a href="#represents">represents</a>
622: nothing.</p><p>The <code><a href="#the-datalist-element">datalist</a></code> element is hooked up to an
623: <code><a href="the-input-element.html#the-input-element">input</a></code> element using the <code title="attr-input-list"><a href="common-input-element-attributes.html#attr-input-list">list</a></code> attribute on the
624: <code><a href="the-input-element.html#the-input-element">input</a></code> element. <!-- v2DATAGRID The
625: <code>datalist</code> element can also be used with a
626: <code>datagrid</code> element, as the source of autocompletion hints
627: for <code title="datagrid-type-editable">editable</code>
628: cells. --></p><p>Each <code><a href="#the-option-element">option</a></code> element that is a descendant of the
629: <code><a href="#the-datalist-element">datalist</a></code> element, that is not <a href="#concept-option-disabled" title="concept-option-disabled">disabled</a>, and whose <a href="#concept-option-value" title="concept-option-value">value</a> is a string that isn't the
630: empty string, represents a suggestion. Each suggestion has a <a href="#concept-option-value" title="concept-option-value">value</a> and a <a href="#concept-option-label" title="concept-option-label">label</a>.
631:
632: </p><dl class="domintro"><dt><var title="">datalist</var> . <code title="dom-datalist-options"><a href="#dom-datalist-options">options</a></code></dt>
633:
634: <dd>
635: <p>Returns an <code><a href="urls.html#htmlcollection">HTMLCollection</a></code> of the <code>options</code> elements of the table.</p>
636: </dd>
637:
1.20 mike 638: </dl><h4 id="the-optgroup-element"><span class="secno">4.10.11 </span>The <dfn><code>optgroup</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 639: <dd>None.</dd>
640: <dt>Contexts in which this element may be used:</dt>
641: <dd>As a child of a <code><a href="#the-select-element">select</a></code> element.</dd>
642: <dt>Content model:</dt>
643: <dd>Zero or more <code><a href="#the-option-element">option</a></code> elements.</dd>
644: <dt>Content attributes:</dt>
645: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
646: <dd><code title="attr-optgroup-disabled"><a href="#attr-optgroup-disabled">disabled</a></code></dd>
647: <dd><code title="attr-optgroup-label"><a href="#attr-optgroup-label">label</a></code></dd>
648: <dt>DOM interface:</dt>
649: <dd>
650: <pre class="idl">interface <dfn id="htmloptgroupelement">HTMLOptGroupElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
651: attribute boolean <a href="#dom-optgroup-disabled" title="dom-optgroup-disabled">disabled</a>;
652: attribute DOMString <a href="#dom-optgroup-label" title="dom-optgroup-label">label</a>;
653: };</pre>
654: </dd>
655: </dl><!-- v2: make optgroups selectable if they have a value. --><p>The <code><a href="#the-optgroup-element">optgroup</a></code> element <a href="#represents">represents</a> a group of
656: <code><a href="#the-option-element">option</a></code> elements with a common label.</p><p>The element's group of <code><a href="#the-option-element">option</a></code> elements consists of
657: the <code><a href="#the-option-element">option</a></code> elements that are children of the
658: <code><a href="#the-optgroup-element">optgroup</a></code> element.</p><p>The <dfn id="attr-optgroup-disabled" title="attr-optgroup-disabled"><code>disabled</code></dfn> attribute
659: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a> and can be used to <a href="#concept-option-disabled" title="concept-option-disabled">disable</a> a group of
660: <code><a href="#the-option-element">option</a></code> elements together.</p><p>The <dfn id="attr-optgroup-label" title="attr-optgroup-label"><code>label</code></dfn>
661: attribute must be specified. Its value gives the name of the group,
662: for the purposes of the user interface. </p><div class="example">
663:
664: <p>The following snippet shows how a set of lessons from three
665: courses could be offered in a <code><a href="#the-select-element">select</a></code> drop-down
666: widget:</p>
667:
668: <pre><form action="courseselector.dll" method="get">
669: <p>Which course would you like to watch today?
670: <p><label>Course:
671: <select name="c">
672: <optgroup label="8.01 Physics I: Classical Mechanics">
673: <option value="8.01.1">Lecture 01: Powers of Ten
674: <option value="8.01.2">Lecture 02: 1D Kinematics
675: <option value="8.01.3">Lecture 03: Vectors
676: <optgroup label="8.02 Electricity and Magnestism">
677: <option value="8.02.1">Lecture 01: What holds our world together?
678: <option value="8.02.2">Lecture 02: Electric Field
679: <option value="8.02.3">Lecture 03: Electric Flux
680: <optgroup label="8.03 Physics III: Vibrations and Waves">
681: <option value="8.03.1">Lecture 01: Periodic Phenomenon
682: <option value="8.03.2">Lecture 02: Beats
683: <option value="8.03.3">Lecture 03: Forced Oscillations with Damping
684: </select>
685: </label>
686: <p><input type=submit value="▶ Play">
687: </form></pre>
688:
1.20 mike 689: </div><h4 id="the-option-element"><span class="secno">4.10.12 </span>The <dfn><code>option</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 690: <dd>None.</dd>
691: <dt>Contexts in which this element may be used:</dt>
692: <dd>As a child of a <code><a href="#the-select-element">select</a></code> element.</dd>
693: <dd>As a child of a <code><a href="#the-datalist-element">datalist</a></code> element.</dd>
694: <dd>As a child of an <code><a href="#the-optgroup-element">optgroup</a></code> element.</dd>
695: <dt>Content model:</dt>
696: <dd><a href="content-models.html#text-content" title="text content">Text</a>.</dd>
697: <dt>Content attributes:</dt>
698: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
699: <dd><code title="attr-option-disabled"><a href="#attr-option-disabled">disabled</a></code></dd>
700: <dd><code title="attr-option-label"><a href="#attr-option-label">label</a></code></dd>
701: <dd><code title="attr-option-selected"><a href="#attr-option-selected">selected</a></code></dd>
702: <dd><code title="attr-option-value"><a href="#attr-option-value">value</a></code></dd>
703: <dt>DOM interface:</dt>
704: <dd>
705: <pre class="idl">[NamedConstructor=<a href="#dom-option" title="dom-option">Option</a>(),
706: NamedConstructor=<a href="#dom-option-t" title="dom-option-t">Option</a>(in DOMString text),
707: NamedConstructor=<a href="#dom-option-tv" title="dom-option-tv">Option</a>(in DOMString text, in DOMString value),
708: NamedConstructor=<a href="#dom-option-tvd" title="dom-option-tvd">Option</a>(in DOMString text, in DOMString value, in boolean defaultSelected),
709: NamedConstructor=<a href="#dom-option-tvds" title="dom-option-tvds">Option</a>(in DOMString text, in DOMString value, in boolean defaultSelected, in boolean selected)]
710: interface <dfn id="htmloptionelement">HTMLOptionElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
711: attribute boolean <a href="#dom-option-disabled" title="dom-option-disabled">disabled</a>;
712: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-option-form" title="dom-option-form">form</a>;
713: attribute DOMString <a href="#dom-option-label" title="dom-option-label">label</a>;
714: attribute boolean <a href="#dom-option-defaultselected" title="dom-option-defaultSelected">defaultSelected</a>;
715: attribute boolean <a href="#dom-option-selected" title="dom-option-selected">selected</a>;
716: attribute DOMString <a href="#dom-option-value" title="dom-option-value">value</a>;
717:
718: attribute DOMString <a href="#dom-option-text" title="dom-option-text">text</a>;
719: readonly attribute long <a href="#dom-option-index" title="dom-option-index">index</a>;
720: };</pre>
721: </dd>
722: </dl><p>The <code><a href="#the-option-element">option</a></code> element <a href="#represents">represents</a> an option
723: in a <code><a href="#the-select-element">select</a></code> element or as part of a list of suggestions
724: in a <code><a href="#the-datalist-element">datalist</a></code> element.</p><p>The <dfn id="attr-option-disabled" title="attr-option-disabled"><code>disabled</code></dfn>
725: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. An
726: <code><a href="#the-option-element">option</a></code> element is <dfn id="concept-option-disabled" title="concept-option-disabled">disabled</dfn> if its <code title="attr-option-disabled"><a href="#attr-option-disabled">disabled</a></code> attribute is present or
727: if it is a child of an <code><a href="#the-optgroup-element">optgroup</a></code> element whose <code title="attr-optgroup-disabled"><a href="#attr-optgroup-disabled">disabled</a></code> attribute is
728: present.</p><p>The <dfn id="attr-option-label" title="attr-option-label"><code>label</code></dfn>
729: attribute provides a label for element. The <dfn id="concept-option-label" title="concept-option-label">label</dfn> of an <code><a href="#the-option-element">option</a></code>
730: element is the value of the <code title="attr-option-label"><a href="#attr-option-label">label</a></code> attribute, if there is one,
1.19 mike 731: or the <code><a href="#textcontent">textContent</a></code> of the element, if there isn't.</p><p>The <dfn id="attr-option-value" title="attr-option-value"><code>value</code></dfn>
1.9 mike 732: attribute provides a value for element. The <dfn id="concept-option-value" title="concept-option-value">value</dfn> of an <code><a href="#the-option-element">option</a></code>
733: element is the value of the <code title="attr-option-value"><a href="#attr-option-value">value</a></code> attribute, if there is one,
1.19 mike 734: or the <code><a href="#textcontent">textContent</a></code> of the element, if there isn't.</p><p>The <dfn id="attr-option-selected" title="attr-option-selected"><code>selected</code></dfn>
1.9 mike 735: attribute represents the default <a href="#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the
736: element.</p><dl class="domintro"><dt><var title="">option</var> . <code title="dom-option-selected"><a href="#dom-option-selected">selected</a></code></dt>
737:
738: <dd>
739:
740: <p>Returns true if the element is selected, and false otherwise.</p>
741:
742: </dd>
743:
744: <dt><var title="">option</var> . <code title="dom-option-index"><a href="#dom-option-index">index</a></code></dt>
745:
746: <dd>
747:
748: <p>Returns the index of the element in its <code><a href="#the-select-element">select</a></code>
749: element's <code title="dom-select-options"><a href="#dom-select-options">options</a></code>
750: list.</p>
751:
752: </dd>
753:
754: <dt><var title="">option</var> . <code title="dom-option-form"><a href="#dom-option-form">form</a></code></dt>
755:
756: <dd>
757:
758: <p>Returns the element's <code><a href="forms.html#the-form-element">form</a></code> element, if any, or
759: null otherwise.</p>
760:
761: </dd>
762:
1.11 mike 763: <dt><var title="">option</var> . <code title="dom-option-text"><a href="#dom-option-text">text</a></code></dt>
764:
765: <dd>
766:
1.19 mike 767: <p>Same as <code><a href="#textcontent">textContent</a></code>.</p>
1.11 mike 768:
769: </dd>
770:
1.9 mike 771: <dt><var title="">option</var> = new <code title="dom-option"><a href="#dom-option">Option</a></code>( [ <var title="">text</var> [, <var title="">value</var> [, <var title="">defaultSelected</var> [, <var title="">selected</var> ] ] ] ] )</dt>
772:
773: <dd>
774:
775: <p>Returns a new <code><a href="#the-option-element">option</a></code> element.</p>
776:
777: <p>The <var title="">text</var> argument sets the contents of the element.</p>
778: <p>The <var title="">value</var> argument sets the <code title="attr-option-value"><a href="#attr-option-value">value</a></code> attribute.</p>
779: <p>The <var title="">defaultSelected</var> argument sets the <code title="attr-option-selected"><a href="#attr-option-selected">selected</a></code> attribute.</p>
780: <p>The <var title="">selected</var> argument sets whether or not the element is selected. If it is omitted, even if the <var title="">defaultSelected</var> argument is true, the element is not selected.</p>
781:
782: </dd>
783:
1.20 mike 784: </dl><h4 id="the-textarea-element"><span class="secno">4.10.13 </span>The <dfn><code>textarea</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 785: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
786: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
787: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
788: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, <a href="forms.html#category-submit" title="category-submit">submittable</a>, and <a href="forms.html#category-reset" title="category-reset">resettable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
789: <dt>Contexts in which this element may be used:</dt>
790: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
791: <dt>Content model:</dt>
792: <dd><a href="content-models.html#text-content" title="text content">Text</a>.</dd>
793: <dt>Content attributes:</dt>
794: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
795: <dd><code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code></dd>
796: <dd><code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code></dd>
797: <dd><code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code></dd>
798: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
799: <dd><code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code></dd>
800: <dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
801: <dd><code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code></dd>
802: <dd><code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code></dd>
803: <dd><code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code></dd>
804: <dd><code title="attr-textarea-rows"><a href="#attr-textarea-rows">rows</a></code></dd>
805: <dd><code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code></dd>
806: <dt>DOM interface:</dt>
807: <dd>
808: <pre class="idl">interface <dfn id="htmltextareaelement">HTMLTextAreaElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
809: attribute boolean <a href="#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
810: attribute unsigned long <a href="#dom-textarea-cols" title="dom-textarea-cols">cols</a>;
811: attribute boolean <a href="#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
812: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
813: attribute long <a href="#dom-textarea-maxlength" title="dom-textarea-maxLength">maxLength</a>;
814: attribute DOMString <a href="#dom-fe-name" title="dom-fe-name">name</a>;
815: attribute DOMString <a href="#dom-textarea-placeholder" title="dom-textarea-placeholder">placeholder</a>;
816: attribute boolean <a href="#dom-textarea-readonly" title="dom-textarea-readOnly">readOnly</a>;
817: attribute boolean <a href="#dom-textarea-required" title="dom-textarea-required">required</a>;
818: attribute unsigned long <a href="#dom-textarea-rows" title="dom-textarea-rows">rows</a>;
819: attribute DOMString <a href="#dom-textarea-wrap" title="dom-textarea-wrap">wrap</a>;
820:
821: readonly attribute DOMString <a href="#dom-textarea-type" title="dom-textarea-type">type</a>;
822: attribute DOMString <a href="#dom-textarea-defaultvalue" title="dom-textarea-defaultValue">defaultValue</a>;
823: attribute DOMString <a href="#dom-textarea-value" title="dom-textarea-value">value</a>;
824: readonly attribute unsigned long <a href="#dom-textarea-textlength" title="dom-textarea-textLength">textLength</a>;
825:
826: readonly attribute boolean <a href="#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
827: readonly attribute <a href="#validitystate">ValidityState</a> <a href="#dom-cva-validity" title="dom-cva-validity">validity</a>;
828: readonly attribute DOMString <a href="#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
829: boolean <a href="#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
830: void <a href="#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
831:
1.19 mike 832: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.9 mike 833:
834: void <a href="#dom-textarea-input-select" title="dom-textarea/input-select">select</a>();
835: attribute unsigned long <a href="#dom-textarea-input-selectionstart" title="dom-textarea/input-selectionStart">selectionStart</a>;
836: attribute unsigned long <a href="#dom-textarea-input-selectionend" title="dom-textarea/input-selectionEnd">selectionEnd</a>;
837: void <a href="#dom-textarea-input-setselectionrange" title="dom-textarea/input-setSelectionRange">setSelectionRange</a>(in unsigned long start, in unsigned long end);
838: };</pre>
839: </dd>
840: </dl><p>The <code><a href="#the-textarea-element">textarea</a></code> element <a href="#represents">represents</a> a
841: multiline plain text edit control. The contents of the control represent the
842: control's default value.</p><p>The <dfn id="attr-textarea-readonly" title="attr-textarea-readonly"><code>readonly</code></dfn> attribute
843: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a> used to control whether the text
844: can be edited by the user or not.</p><p>The <dfn id="attr-textarea-cols" title="attr-textarea-cols"><code>cols</code></dfn>
845: attribute specifies the expected maximum number of characters per
846: line. If the <code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code> attribute
847: is specified, its value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative
848: integer</a> greater than zero. </p><p>The <dfn id="attr-textarea-rows" title="attr-textarea-rows"><code>rows</code></dfn>
849: attribute specifies the number of lines to show. If the <code title="attr-textarea-rows"><a href="#attr-textarea-rows">rows</a></code> attribute is specified, its
850: value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a> greater than
851: zero. </p><p>The <dfn id="attr-textarea-wrap" title="attr-textarea-wrap"><code>wrap</code></dfn>
852: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a> with two keywords
853: and states: the <dfn id="attr-textarea-wrap-soft" title="attr-textarea-wrap-soft"><code>soft</code></dfn> keyword
854: which maps to the <dfn id="attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</dfn> state, and the
855: <dfn id="attr-textarea-wrap-hard" title="attr-textarea-wrap-hard"><code>hard</code></dfn> keyword
856: which maps to the <dfn id="attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</dfn> state. The
857: <i>missing value default</i> is the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state.</p><p>If the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code>
858: attribute is in the <a href="#attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</a> state, the <code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code> attribute must be
859: specified.</p><!-- attr-textarea-wrap-off (attr-textarea-wrap-off-state): not
860: conforming; turns off the rendering of wrapping but otherwise acts
861: like 'soft' --><p>The <dfn id="attr-textarea-maxlength" title="attr-textarea-maxlength"><code>maxlength</code></dfn>
862: attribute is a <a href="association-of-controls-and-forms.html#attr-fe-maxlength" title="attr-fe-maxlength">form control <code title="">maxlength</code> attribute</a> controlled by the
863: <code><a href="#the-textarea-element">textarea</a></code> element's <a href="#concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</a>.</p><p>If the <code><a href="#the-textarea-element">textarea</a></code> element has a <a href="association-of-controls-and-forms.html#maximum-allowed-value-length">maximum allowed
864: value length</a>, then the element's children must be such that
865: the <a href="#code-point-length">code-point length</a> of the value of the element's
1.19 mike 866: <code><a href="#textcontent">textContent</a></code> IDL attribute is equal to or less than the
1.9 mike 867: element's <a href="association-of-controls-and-forms.html#maximum-allowed-value-length">maximum allowed value length</a>.</p><p>The <dfn id="attr-textarea-required" title="attr-textarea-required"><code>required</code></dfn> attribute
868: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the user will
869: be required to enter a value before submitting the form.</p><!-- similar text in the <input> section --><p>The <dfn id="attr-textarea-placeholder" title="attr-textarea-placeholder"><code>placeholder</code></dfn>
870: attribute represents a hint (a word or short phrase) intended to aid
871: the user with data entry. A hint could be a sample value or a brief
872: description of the expected format. The attribute, if specified,
873: must have a value that contains no U+000A LINE FEED (LF) or U+000D
874: CARRIAGE RETURN (CR) characters.</p><p class="note">For a longer hint or other advisory text, the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute is more appropriate.</p><p>The <code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code>
875: attribute should not be used as an alternative to a
876: <code><a href="forms.html#the-label-element">label</a></code>.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
877: explicitly associate the <code><a href="#the-textarea-element">textarea</a></code> element with its
878: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
879: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code> attribute is used to make
880: the control non-interactive and to prevent its value from being
881: submitted. The <code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code>
882: attribute controls focus.</p><dl class="domintro"><dt><var title="">textarea</var> . <code title="attr-textarea-type">type</code></dt>
883:
884: <dd>
885:
886: <p>Returns the string "<code title="">textarea</code>".</p>
887:
888: </dd>
889:
890: <dt><var title="">textarea</var> . <code title="attr-textarea-value">value</code></dt>
891:
892: <dd>
893:
894: <p>Returns the current value of the element.</p>
895:
896: <p>Can be set, to change the value.</p>
897:
898: </dd>
899:
900: </dl><div class="example">
901:
902: <p>Here is an example of a <code><a href="#the-textarea-element">textarea</a></code> being used for
903: unrestricted free-form text input in a form:</p>
904:
905: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments></textarea></p></pre>
906:
1.20 mike 907: </div><h4 id="the-keygen-element"><span class="secno">4.10.14 </span>The <dfn><code>keygen</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 908: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
909: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
910: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
911: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, <a href="forms.html#category-submit" title="category-submit">submittable</a>, and <a href="forms.html#category-reset" title="category-reset">resettable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
912: <dt>Contexts in which this element may be used:</dt>
913: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
914: <dt>Content model:</dt>
915: <dd>Empty.</dd>
916: <dt>Content attributes:</dt>
917: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
918: <dd><code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code></dd>
919: <dd><code title="attr-keygen-challenge"><a href="#attr-keygen-challenge">challenge</a></code></dd>
920: <dd><code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code></dd>
921: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
922: <dd><code title="attr-keygen-keytype"><a href="#attr-keygen-keytype">keytype</a></code></dd>
923: <dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
924: <dt>DOM interface:</dt>
925: <dd>
926: <pre class="idl">interface <dfn id="htmlkeygenelement">HTMLKeygenElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
927: attribute boolean <a href="#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
928: attribute DOMString <a href="#dom-keygen-challenge" title="dom-keygen-challenge">challenge</a>;
929: attribute boolean <a href="#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
930: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
931: attribute DOMString <a href="#dom-keygen-keytype" title="dom-keygen-keytype">keytype</a>;
932: attribute DOMString <a href="#dom-fe-name" title="dom-fe-name">name</a>;
933:
934: readonly attribute DOMString <a href="#dom-keygen-type" title="dom-keygen-type">type</a>;
935:
936: readonly attribute boolean <a href="#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
937: readonly attribute <a href="#validitystate">ValidityState</a> <a href="#dom-cva-validity" title="dom-cva-validity">validity</a>;
938: readonly attribute DOMString <a href="#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
939: boolean <a href="#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
940: void <a href="#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
941:
1.19 mike 942: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.9 mike 943: };</pre>
944: </dd>
945: </dl><p>The <code><a href="#the-keygen-element">keygen</a></code> element <a href="#represents">represents</a> a key
946: pair generator control. When the control's form is submitted, the
947: private key is stored in the local keystore, and the public key is
948: packaged and sent to the server.</p><p>The <dfn id="attr-keygen-challenge" title="attr-keygen-challenge"><code>challenge</code></dfn> attribute
949: may be specified. Its value will be packaged with the submitted
950: key.</p><p>The <dfn id="attr-keygen-keytype" title="attr-keygen-keytype"><code>keytype</code></dfn>
951: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The following
952: table lists the keywords and states for the attribute — the
953: keywords in the left column map to the states listed in the cell in
954: the second column on the same row as the keyword. User agents are
955: not required to support these values, and must only recognise values
956: whose corresponding algorithms they support.</p><table><thead><tr><th> Keyword </th><th> State
957: </th></tr></thead><tbody><tr><td> <code title="">rsa</code>
958: </td><td> <i title="">RSA</i>
959: <!-- v2 (see below)
960: <tr>
961: <td> <code title="">ec</code>
962: <td> <i title="">EC</i>
963: -->
964: </td></tr></tbody></table><p>The <i>invalid value default</i> state is the <i title="">unknown</i> state. The <i>missing value default</i> state
965: is the <i title="">RSA</i> state, if it is supported, or the <i title="">unknown</i> state otherwise.</p><p class="note">This specification does not specify what key types
966: user agents are to support — it is possible for a user agent
967: to not support any key types at all.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
968: explicitly associate the <code><a href="#the-keygen-element">keygen</a></code> element with its
969: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
970: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="association-of-controls-and-forms.html#attr-fe-disabled">disabled</a></code> attribute is used to make
971: the control non-interactive and to prevent its value from being
972: submitted. The <code title="attr-fe-autofocus"><a href="association-of-controls-and-forms.html#attr-fe-autofocus">autofocus</a></code>
973: attribute controls focus.</p><dl class="domintro"><dt><var title="">keygen</var> . <code title="attr-keygen-type">type</code></dt>
974:
975: <dd>
976:
977: <p>Returns the string "<code title="">keygen</code>".</p>
978:
979: </dd>
980:
981: </dl><p class="note">This specification does not specify how the private
982: key generated is to be used. It is expected that after receiving the
983: <code><a href="#signedpublickeyandchallenge">SignedPublicKeyAndChallenge</a></code> (SPKAC) structure, the
984: server will generate a client certificate and offer it back to the
985: user for download; this certificate, once downloaded and stored in
986: the key store along with the private key, can then be used to
987: authenticate to services that use SSL and certificate
988: authentication.</p><!-- how does the UA know which private key is associated with a
989: certificate it gets back after the server has taken the public key
990: created by <keygen> and turned it into a client cert? --><div class="example">
991:
992: <p>To generate a key pair, add the private key to the user's key
993: store, and submit the public key to the server, markup such as the
994: following can be used:</p>
995:
996: <pre><form action="processkey.cgi" method="post" enctype="multipart/formdata">
997: <p><keygen name="key"></p>
998: <p><input type=submit value="Submit key..."></p>
999: </form></pre>
1000:
1001: <p>The server will then receive a form submission with a packaged
1002: RSA public key as the value of "<code title="">key</code>". This
1003: can then be used for various purposes, such as generating a client
1004: certificate, as mentioned above.</p>
1005:
1.20 mike 1006: </div><h4 id="the-output-element"><span class="secno">4.10.15 </span>The <dfn><code>output</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments</i></p><dl class="element"><dt>Categories</dt>
1.9 mike 1007: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
1008: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
1.11 mike 1009: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, and <a href="forms.html#category-reset" title="category-reset">resettable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
1.9 mike 1010: <dt>Contexts in which this element may be used:</dt>
1011: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1012: <dt>Content model:</dt>
1013: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
1014: <dt>Content attributes:</dt>
1015: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
1016: <dd><code title="attr-output-for"><a href="#attr-output-for">for</a></code></dd>
1017: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
1018: <dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
1019: <dt>DOM interface:</dt>
1020: <dd>
1021: <pre class="idl">interface <dfn id="htmloutputelement">HTMLOutputElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
1.12 mike 1022: [PutForwards=<a href="#dom-domsettabletokenlist-value" title="dom-DOMSettableTokenList-value">value</a>] readonly attribute <a href="urls.html#domsettabletokenlist">DOMSettableTokenList</a> <span title="dom-output-wrap">htmlFor</span>;
1.9 mike 1023: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
1024: attribute DOMString <a href="#dom-fe-name" title="dom-fe-name">name</a>;
1025:
1026: readonly attribute DOMString <a href="#dom-output-type" title="dom-output-type">type</a>;
1027: attribute DOMString <a href="#dom-output-defaultvalue" title="dom-output-defaultValue">defaultValue</a>;
1028: attribute DOMString <a href="#dom-output-value" title="dom-output-value">value</a>;
1029:
1030: readonly attribute boolean <a href="#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
1031: readonly attribute <a href="#validitystate">ValidityState</a> <a href="#dom-cva-validity" title="dom-cva-validity">validity</a>;
1032: readonly attribute DOMString <a href="#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
1033: boolean <a href="#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
1034: void <a href="#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
1.11 mike 1035:
1.19 mike 1036: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.9 mike 1037: };</pre>
1038: </dd>
1039: </dl><p>The <code><a href="#the-output-element">output</a></code> element <a href="#represents">represents</a> the result of a
1040: calculation.</p><p>The <dfn id="attr-output-for" title="attr-output-for"><code>for</code></dfn> content
1041: attribute allows an explicit relationship to be made between the
1042: result of a calculation and the elements that represent the values
1043: that went into the calculation or that otherwise influenced the
1044: calculation. The <code title="attr-output-for"><a href="#attr-output-for">for</a></code> attribute,
1045: if specified, must contain a string consisting of an <a href="common-microsyntaxes.html#unordered-set-of-unique-space-separated-tokens">unordered
1046: set of unique space-separated tokens</a>, each of which must have
1047: the value of an ID of an element in the same
1.19 mike 1048: <code><a href="#document">Document</a></code>.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
1.9 mike 1049: explicitly associate the <code><a href="#the-output-element">output</a></code> element with its
1050: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
1051: attribute represents the element's name.</p><dl class="domintro"><dt><var title="">output</var> . <code title="dom-output-value"><a href="#dom-output-value">value</a></code> [ = <var title="">value</var> ]</dt>
1052:
1053: <dd>
1054:
1055: <p>Returns the element's current value.</p>
1056:
1057: <p>Can be set, to change the value.</p>
1058:
1059: </dd>
1060:
1061: <dt><var title="">output</var> . <code title="dom-output-defaultValue"><a href="#dom-output-defaultvalue">defaultValue</a></code> [ = <var title="">value</var> ]</dt>
1062:
1063: <dd>
1064:
1065: <p>Returns the element's current default value.</p>
1066:
1067: <p>Can be set, to change the default value.</p>
1068:
1069: </dd>
1070:
1071: <dt><var title="">output</var> . <code title="dom-output-type"><a href="#dom-output-type">type</a></code></dt>
1072:
1073: <dd>
1074:
1075: <p>Returns the string "<code title="">output</code>".</p>
1076:
1077: </dd>
1078:
1079: </dl><div class="example">
1080:
1081: <p>A simple calculator could use <code><a href="#the-output-element">output</a></code> for its
1082: display of calculated results:</p>
1083:
1084: <pre><form onsubmit="return false">
1085: <input name=a type=number step=any> +
1086: <input name=b type=number step=any> =
1087: <output onforminput="value = a.value + b.value"></output>
1088: </form></pre>
1089:
1.20 mike 1090: </div><h4 id="the-progress-element"><span class="secno">4.10.16 </span>The <dfn><code>progress</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/96">ISSUE-96</a> (progress) blocks progress to Last Call</span></p><dl class="element"><dt>Categories</dt>
1.11 mike 1091: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
1092: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
1093: <dd><a href="forms.html#category-label" title="category-label">Labelable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
1094: <dt>Contexts in which this element may be used:</dt>
1095: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1096: <dt>Content model:</dt>
1097: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>, but there must be no <code><a href="#the-progress-element">progress</a></code> element descendants.</dd>
1098: <dt>Content attributes:</dt>
1099: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
1100: <dd><code title="attr-progress-value"><a href="#attr-progress-value">value</a></code></dd>
1101: <dd><code title="attr-progress-max"><a href="#attr-progress-max">max</a></code></dd>
1102: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
1103: <dt>DOM interface:</dt>
1104: <dd>
1105: <pre class="idl">interface <dfn id="htmlprogresselement">HTMLProgressElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
1106: attribute float <a href="#dom-progress-value" title="dom-progress-value">value</a>;
1107: attribute float <a href="#dom-progress-max" title="dom-progress-max">max</a>;
1108: readonly attribute float <a href="#dom-progress-position" title="dom-progress-position">position</a>;
1109: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
1.19 mike 1110: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.11 mike 1111: };</pre>
1112: </dd>
1113: </dl><p>The <code><a href="#the-progress-element">progress</a></code> element <a href="#represents">represents</a> the
1114: completion progress of a task. The progress is either indeterminate,
1115: indicating that progress is being made but that it is not clear how
1116: much more work remains to be done before the task is complete
1117: (e.g. because the task is waiting for a remote host to respond), or
1118: the progress is a number in the range zero to a maximum, giving the
1119: fraction of work that has so far been completed.</p><p>There are two attributes that determine the current task
1120: completion represented by the element.</p><p>The <dfn id="attr-progress-value" title="attr-progress-value"><code>value</code></dfn>
1121: attribute specifies how much of the task has been completed, and the
1122: <dfn id="attr-progress-max" title="attr-progress-max"><code>max</code></dfn> attribute
1123: specifies how much work the task requires in total. The units are
1124: arbitrary and not specified.</p><p>Authors are encouraged to also include the current value and the
1125: maximum value inline as text inside the element, so that the
1126: progress is made available to users of legacy user agents.</p><div class="example">
1127: <p>Here is a snippet of a Web application that shows the progress
1128: of some automated task:</p>
1129: <pre><section>
1130: <h2>Task Progress</h2>
1131: <p>Progress: <progress id="p" max=100><span>0</span>%</progress></p>
1132: <script>
1133: var progressBar = document.getElementById('p');
1134: function updateProgress(newValue) {
1135: progressBar.value = newValue;
1136: progressBar.getElementsByTagName('span')[0].textContent = newValue;
1137: }
1138: </script>
1139: </section></pre>
1140: <p>(The <code>updateProgress()</code> method in this example would
1141: be called by some other code on the page to update the actual
1142: progress bar as the task progressed.)</p>
1143: </div><p>The <code title="attr-progress-value"><a href="#attr-progress-value">value</a></code> and <code title="attr-progress-max"><a href="#attr-progress-max">max</a></code> attributes, when present, must
1144: have values that are <a href="common-microsyntaxes.html#valid-floating-point-number" title="valid floating point number">valid
1145: floating point numbers</a>. The <code title="attr-progress-value"><a href="#attr-progress-value">value</a></code> attribute, if present, must
1146: have a value equal to or greater than zero, and less than or equal
1147: to the value of the <code title="attr-progress-max"><a href="#attr-progress-max">max</a></code>
1148: attribute, if present, or 1.0, otherwise. The <code title="attr-progress-max"><a href="#attr-progress-max">max</a></code> attribute, if present, must
1149: have a value greater than zero.</p><p class="note">The <code><a href="#the-progress-element">progress</a></code> element is the wrong
1150: element to use for something that is just a gauge, as opposed to
1151: task progress. For instance, indicating disk space usage using
1152: <code><a href="#the-progress-element">progress</a></code> would be inappropriate. Instead, the
1153: <code><a href="#the-meter-element">meter</a></code> element is available for such use cases.</p><dl class="domintro"><dt><var title="">progress</var> . <code title="dom-progress-position"><a href="#dom-progress-position">position</a></code></dt>
1154:
1155: <dd>
1156:
1157: <p>For a determinate progress bar (one with known current and
1158: maximum values), returns the result of dividing the current value
1159: by the maximum value.</p>
1160:
1161: <p>For an indeterminate progress bar, returns −1.</p>
1162:
1.20 mike 1163: </dd></dl><h4 id="the-meter-element"><span class="secno">4.10.17 </span>The <dfn><code>meter</code></dfn> element</h4><p class="XXX annotation"><b>Status: </b><i>Last call for comments. </i><span><a href="http://www.w3.org/html/wg/tracker/issues/97">ISSUE-97</a> (meter) blocks progress to Last Call</span></p><!-- Keep this after <progress> and NOT close to <time> --><dl class="element"><dt>Categories</dt>
1.11 mike 1164: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
1165: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
1166: <dd><a href="forms.html#category-label" title="category-label">Labelable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
1167: <dt>Contexts in which this element may be used:</dt>
1168: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1169: <dt>Content model:</dt>
1170: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>, but there must be no <code><a href="#the-meter-element">meter</a></code> element descendants.</dd>
1171: <dt>Content attributes:</dt>
1172: <dd><a href="elements.html#global-attributes">Global attributes</a></dd>
1173: <dd><code title="attr-meter-value"><a href="#attr-meter-value">value</a></code></dd>
1174: <dd><code title="attr-meter-min"><a href="#attr-meter-min">min</a></code></dd>
1175: <dd><code title="attr-meter-max"><a href="#attr-meter-max">max</a></code></dd>
1176: <dd><code title="attr-meter-low"><a href="#attr-meter-low">low</a></code></dd>
1177: <dd><code title="attr-meter-high"><a href="#attr-meter-high">high</a></code></dd>
1178: <dd><code title="attr-meter-optimum"><a href="#attr-meter-optimum">optimum</a></code></dd>
1179: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
1180: <dt>DOM interface:</dt>
1181: <dd>
1182: <pre class="idl">interface <dfn id="htmlmeterelement">HTMLMeterElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
1183: attribute float <a href="#dom-meter-value" title="dom-meter-value">value</a>;
1184: attribute float <a href="#dom-meter-min" title="dom-meter-min">min</a>;
1185: attribute float <a href="#dom-meter-max" title="dom-meter-max">max</a>;
1186: attribute float <a href="#dom-meter-low" title="dom-meter-low">low</a>;
1187: attribute float <a href="#dom-meter-high" title="dom-meter-high">high</a>;
1188: attribute float <a href="#dom-meter-optimum" title="dom-meter-optimum">optimum</a>;
1189: readonly attribute <a href="forms.html#htmlformelement">HTMLFormElement</a> <a href="#dom-fae-form" title="dom-fae-form">form</a>;
1.19 mike 1190: readonly attribute <a href="#nodelist">NodeList</a> <a href="#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
1.11 mike 1191: };</pre>
1192: </dd>
1193: </dl><p>The <code><a href="#the-meter-element">meter</a></code> element <a href="#represents">represents</a> a scalar
1194: measurement within a known range, or a fractional value; for example
1195: disk usage, the relevance of a query result, or the fraction of a
1196: voting population to have selected a particular candidate.</p><p>This is also known as a gauge.</p><p class="note">The <code><a href="#the-meter-element">meter</a></code> element should not be used to
1197: indicate progress (as in a progress bar). For that role, HTML
1198: provides a separate <code><a href="#the-progress-element">progress</a></code> element.</p><p class="note">The <code><a href="#the-meter-element">meter</a></code> element also does not
1199: represent a scalar value of arbitrary range — for example, it
1200: would be wrong to use this to report a weight, or height, unless
1201: there is a known maximum value.</p><p>There are six attributes that determine the semantics of the
1202: gauge represented by the element.</p><p>The <dfn id="attr-meter-min" title="attr-meter-min"><code>min</code></dfn> attribute
1203: specifies the lower bound of the range, and the <dfn id="attr-meter-max" title="attr-meter-max"><code>max</code></dfn> attribute specifies
1204: the upper bound. The <dfn id="attr-meter-value" title="attr-meter-value"><code>value</code></dfn> attribute
1205: specifies the value to have the gauge indicate as the "measured"
1206: value.</p><p>The other three attributes can be used to segment the gauge's
1207: range into "low", "medium", and "high" parts, and to indicate which
1208: part of the gauge is the "optimum" part. The <dfn id="attr-meter-low" title="attr-meter-low"><code>low</code></dfn> attribute specifies
1209: the range that is considered to be the "low" part, and the <dfn id="attr-meter-high" title="attr-meter-high"><code>high</code></dfn> attribute specifies
1210: the range that is considered to be the "high" part. The <dfn id="attr-meter-optimum" title="attr-meter-optimum"><code>optimum</code></dfn> attribute
1211: gives the position that is "optimum"; if that is higher than the
1212: "high" value then this indicates that the higher the value, the
1213: better; if it's lower than the "low" mark then it indicates that
1214: lower values are better, and naturally if it is in between then it
1.17 mike 1215: indicates that neither high nor low values are good.</p><p> The <code title="attr-meter-value"><a href="#attr-meter-value">value</a></code> attribute must be
1.11 mike 1216: specified. The <code title="attr-meter-value"><a href="#attr-meter-value">value</a></code>, <code title="attr-meter-min"><a href="#attr-meter-min">min</a></code>, <code title="attr-meter-low"><a href="#attr-meter-low">low</a></code>, <code title="attr-meter-high"><a href="#attr-meter-high">high</a></code>, <code title="attr-meter-max"><a href="#attr-meter-max">max</a></code>, and <code title="attr-meter-optimum"><a href="#attr-meter-optimum">optimum</a></code> attributes, when present,
1217: must have values that are <a href="common-microsyntaxes.html#valid-floating-point-number" title="valid floating point
1218: number">valid floating point numbers</a>.</p><p>In addition, the attributes' values are further constrained:</p><p>Let <var title="">value</var> be the <code title="attr-meter-value"><a href="#attr-meter-value">value</a></code> attribute's number.</p><p>If the <code title="attr-meter-min"><a href="#attr-meter-min">min</a></code> attribute
1219: attribute is specified, then let <var title="">minimum</var> be that
1220: attribute's value; otherwise, let it be zero.</p><p>If the <code title="attr-meter-max"><a href="#attr-meter-max">max</a></code> attribute
1221: attribute is specified, then let <var title="">maximum</var> be that
1222: attribute's value; otherwise, let it be 1.0.</p><p>The following inequalities must hold, as applicable:</p><ul class="brief"><li><var title="">minimum</var> ≤ <var title="">value</var> ≤ <var title="">maximum</var></li>
1223: <li><var title="">minimum</var> ≤ <code title="attr-meter-low"><a href="#attr-meter-low">low</a></code> ≤ <var title="">maximum</var> (if <code title="attr-meter-low"><a href="#attr-meter-low">low</a></code> is specified)</li>
1224: <li><var title="">minimum</var> ≤ <code title="attr-meter-high"><a href="#attr-meter-high">high</a></code> ≤ <var title="">maximum</var> (if <code title="attr-meter-high"><a href="#attr-meter-high">high</a></code> is specified)</li>
1225: <li><var title="">minimum</var> ≤ <code title="attr-meter-optimum"><a href="#attr-meter-optimum">optimum</a></code> ≤ <var title="">maximum</var> (if <code title="attr-meter-optimum"><a href="#attr-meter-optimum">optimum</a></code> is specified)</li>
1.21 ! mike 1226: <li><code title="attr-meter-low"><a href="#attr-meter-low">low</a></code> ≤ <code title="attr-meter-high"><a href="#attr-meter-high">high</a></code> (if both <code title="attr-meter-low"><a href="#attr-meter-low">low</a></code> and <code title="attr-meter-high"><a href="#attr-meter-high">high</a></code> are specified)</li>
! 1227: </ul><p class="note">If no minimum or maximum is specified, then the
1.11 mike 1228: range is assumed to be 0..1, and the value thus has to be within
1229: that range.</p><p>Authors are encouraged to include a textual representation of the
1230: gauge's state in the element's contents, for users of user agents
1231: that do not support the <code><a href="#the-meter-element">meter</a></code> element.</p><div class="example">
1232:
1233: <p>The following examples show three gauges that would all be
1234: three-quarters full:</p>
1235:
1236: <pre>Storage space usage: <meter value=6 max=8>6 blocks used (out of 8 total)</meter>
1237: Voter turnout: <meter value=0.75><img alt="75%" src="graph75.png"></meter>
1238: Tickets sold: <meter min="0" max="100" value="75"></meter></pre>
1239:
1240: <p>The following example is incorrect use of the element, because
1241: it doesn't give a range (and since the default maximum is 1, both
1242: of the gauges would end up looking maxed out):</p>
1243:
1244: <pre class="bad"><p>The grapefruit pie had a radius of <meter value=12>12cm</meter>
1245: and a height of <meter value=2>2cm</meter>.</p> <!-- <strong>BAD!</strong> --></pre>
1246:
1247: <p>Instead, one would either not include the meter element, or use
1248: the meter element with a defined range to give the dimensions in
1249: context compared to other pies:</p>
1250:
1251: <pre><p>The grapefruit pie had a radius of 12cm and a height of
1252: 2cm.</p>
1253: <dl>
1254: <dt>Radius: <dd> <meter min=0 max=20 value=12>12cm</meter>
1255: <dt>Height: <dd> <meter min=0 max=10 value=2>2cm</meter>
1256: </dl></pre>
1257:
1258: </div><p>There is no explicit way to specify units in the
1259: <code><a href="#the-meter-element">meter</a></code> element, but the units may be specified in the
1260: <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute in free-form text.</p><div class="example">
1261:
1262: <p>The example above could be extended to mention the units:</p>
1263:
1264: <pre><dl>
1265: <dt>Radius: <dd> <meter min=0 max=20 value=12 title="centimeters">12cm</meter>
1266: <dt>Height: <dd> <meter min=0 max=10 value=2 title="centimeters">2cm</meter>
1267: </dl></pre>
1268:
1269: </div><div class="example">
1270: <p>The following markup:</p>
1271: <pre><h3>Suggested groups</h3>
1272: <menu type="toolbar">
1273: <a href="?cmd=hsg" onclick="hideSuggestedGroups()">Hide suggested groups</a>
1274: </menu>
1275: <ul>
1276: <li>
1277: <p><a href="/group/comp.infosystems.www.authoring.stylesheets/view">comp.infosystems.www.authoring.stylesheets</a> -
1278: <a href="/group/comp.infosystems.www.authoring.stylesheets/subscribe">join</a></p>
1279: <p>Group description: <strong>Layout/presentation on the WWW.</strong></p>
1280: <p><strong><meter value="0.5">Moderate activity,</meter></strong> Usenet, 618 subscribers</p>
1281: </li>
1282: <li>
1283: <p><a href="/group/netscape.public.mozilla.xpinstall/view">netscape.public.mozilla.xpinstall</a> -
1284: <a href="/group/netscape.public.mozilla.xpinstall/subscribe">join</a></p>
1285: <p>Group description: <strong>Mozilla XPInstall discussion.</strong></p>
1286: <p><strong><meter value="0.25">Low activity,</meter></strong> Usenet, 22 subscribers</p>
1287: </li>
1288: <li>
1289: <p><a href="/group/mozilla.dev.general/view">mozilla.dev.general</a> -
1290: <a href="/group/mozilla.dev.general/subscribe">join</a></p>
1291: <p><strong><meter value="0.25">Low activity,</meter></strong> Usenet, 66 subscribers</p>
1292: </li>
1293: </ul></pre>
1294: <p>Might be rendered as follows:</p>
1295: <p><img alt="With the <meter> elements rendered as inline green bars of varying lengths." src="http://dev.w3.org/html5/spec/images/sample-meter.png"></p>
1.13 mike 1296: </div><p>User agents combine the value of
1297: the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute and the other
1.11 mike 1298: attributes to provide context-sensitive help or inline text
1299: detailing the actual values.</p><div class="example">
1300: <p>For example, the following snippet:</p>
1301: <pre><meter min=0 max=60 value=23.2 title=seconds></meter></pre>
1302: <p>...might cause the user agent to display a gauge with a tooltip
1303: saying "Value: 23.2 out of 60." on one line and "seconds" on a
1304: second line.</p>
1305: </div><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
1306: explicitly associate the <code><a href="#the-meter-element">meter</a></code> element with its
1307: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>.</p><p><strong>Constraint validation</strong>: <code><a href="#the-meter-element">meter</a></code>
1308: elements are always <a href="#barred-from-constraint-validation">barred from constraint
1309: validation</a>.</p><div class="example">
1310:
1311: <p>The following example shows how a gauge could fall back to
1312: localized or pretty-printed text.</p>
1313:
1314: <pre><p>Disk usage: <meter min=0 value=170261928 max=233257824>170 261 928 bytes used
1315: out of 233 257 824 bytes available</meter></p></pre>
1316:
1.9 mike 1317: </div></body></html>
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