Annotation of html5/spec/the-textarea-element.html, revision 1.112
1.88 mike 1: <!DOCTYPE html>
1.96 mike 2: <html lang="en-US-x-Hixie"><head><title>4.10.13 The textarea element — HTML5</title><link rel="stylesheet" href="alert.css"><style type="text/css">
1.1 mike 3: pre { margin-left: 2em; white-space: pre-wrap; }
4: h2 { margin: 3em 0 1em 0; }
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34:
35: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
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53: dl.domintro dd p { margin: 0.5em 0; }
54: dl.domintro:before { display: table; margin: -1em -0.5em -0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: black; font-style: italic; border: solid 2px; background: white; padding: 0 0.25em; }
55: dl.switch { padding-left: 2em; }
56: dl.switch > dt { text-indent: -1.5em; }
57: dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
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61: dl.triple dd:after { content: '\A'; white-space: pre; }
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64: a .diff-new { border-bottom: 1px blue solid; }
65:
66: h2 { page-break-before: always; }
67: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
68: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
69:
70: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
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72:
73: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
74: div.head p { margin: 0; }
75: div.head h1 { margin: 0; }
76: div.head .logo { float: right; margin: 0 1em; }
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80:
81: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
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84: body > .toc > li > * > li > * { margin-bottom: 0.25em; }
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87: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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96: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
97:
98: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
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151:
152: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
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165:
166: body.dfnEnabled dfn { cursor: pointer; }
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183: .dfnPanel li { list-style-position: inside; }
184:
185: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
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191: fieldset { margin: 1em; padding: 0.5em 1em; }
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194: fieldset p { margin: 0.5em 0; }
195:
1.85 mike 196: .stability {
197: position: fixed;
198: bottom: 0;
199: left: 0; right: 0;
200: margin: 0 auto 0 auto;
201: width: 50%;
202: background: maroon; color: yellow;
203: -webkit-border-radius: 1em 1em 0 0;
204: -moz-border-radius: 1em 1em 0 0;
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214: }
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218: }
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220: color: white;
221: text-shadow: 0 0 2px black;
222: }
223: .stability input:active {
224: padding: 0.3em 0.45em 0.2em 0.55em;
225: }
226: .stability :link, .stability :visited,
227: .stability :link:hover, .stability :visited:hover {
228: background: transparent;
229: color: white;
230: }
231:
232: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css"><meta content="noindex" name="robots"><style type="text/css">
1.1 mike 233:
234: .applies thead th > * { display: block; }
235: .applies thead code { display: block; }
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237: .applies td { text-align: center; }
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243: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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246:
247: td.eg { border-width: thin; text-align: center; }
248:
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251: #table-example-1 caption { padding-bottom: 0.5em; }
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254: #table-example-1 th { font-weight: normal; }
255: #table-example-1 td { border-style: none solid; vertical-align: top; }
256: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
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260: #table-example-1 tbody td:first-child::after { content: leader(". "); }
261: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
262: #table-example-1 tbody td:first-child + td { width: 10em; }
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264: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
265:
266: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
267: .apple-table-examples * { font-family: "Times", serif; }
268: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
269: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
270: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
271: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
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273: .apple-table-examples td { text-align: right; vertical-align: top; }
274: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
275: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
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277: .apple-table-examples sup { line-height: 0; }
278:
279: .details-example img { vertical-align: top; }
280:
281: #base64-table {
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290: -webkit-column-width: 6em;
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292: -webkit-column-gap: 1em;
293: }
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295: #base64-table * { border: none; }
296: #base64-table tbody td:first-child:after { content: ':'; }
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298:
299: #named-character-references-table {
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301: font-size: 0.6em;
302: column-width: 30em;
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306: -webkit-column-width: 30em;
307: -webkit-column-gap: 1em;
308: }
309: #named-character-references-table > table > tbody > tr > td:first-child + td,
310: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
311: #named-character-references-table > table > tbody > tr > td:last-child:hover > span { position: absolute; top: auto; left: auto; margin-left: 0.5em; line-height: 1.2; font-size: 5em; border: outset; padding: 0.25em 0.5em; background: white; width: 1.25em; height: auto; text-align: center; }
312: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
313:
314: .glyph.control { color: red; }
315:
316: @font-face {
317: font-family: 'Essays1743';
318: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
319: }
320: @font-face {
321: font-family: 'Essays1743';
322: font-weight: bold;
323: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
324: }
325: @font-face {
326: font-family: 'Essays1743';
327: font-style: italic;
328: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
329: }
330: @font-face {
331: font-family: 'Essays1743';
332: font-style: italic;
333: font-weight: bold;
334: src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
335: }
336:
337: </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%0Ahtml%20%7B%20border:%20solid%20yellow;%20%7D%20.domintro:before%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%20.domintro:before%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation requirements"><script type="text/javascript">
338: function getCookie(name) {
339: var params = location.search.substr(1).split("&");
340: for (var index = 0; index < params.length; index++) {
341: if (params[index] == name)
342: return "1";
343: var data = params[index].split("=");
344: if (data[0] == name)
345: return unescape(data[1]);
346: }
347: var cookies = document.cookie.split("; ");
348: for (var index = 0; index < cookies.length; index++) {
349: var data = cookies[index].split("=");
350: if (data[0] == name)
351: return unescape(data[1]);
352: }
353: return null;
354: }
1.96 mike 355: </script>
1.1 mike 356: <script src="link-fixup.js"></script>
357: <link href="the-option-element.html" title="4.10.12 The option element" rel="prev">
358: <link href="index.html#contents" title="Table of contents" rel="contents">
359: <link href="the-keygen-element.html" title="4.10.14 The keygen element" rel="next">
1.22 mike 360: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 361: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
362:
363: <h1>HTML5</h1>
1.112 ! mike 364: <h2 class="no-num no-toc" id="a-vocabulary-and-associated-apis-for-html-and-xhtml">A vocabulary and associated APIs for HTML and XHTML</h2><p>This is revision 1.5629.</p>
1.85 mike 365:
1.98 mike 366: <h2 class="no-num no-toc" id="w3c-working-draft-29-march-2012">W3C Working Draft 29 March 2012</h2>
1.85 mike 367: </div>
1.1 mike 368:
1.85 mike 369: <nav class="prev_next">
1.1 mike 370: <a href="the-option-element.html">← 4.10.12 The option element</a> –
371: <a href="index.html#contents">Table of contents</a> –
372: <a href="the-keygen-element.html">4.10.14 The keygen element →</a>
373: </nav>
374:
1.85 mike 375: <h4 id="the-textarea-element"><span class="secno">4.10.13 </span>The <dfn><code>textarea</code></dfn> element</h4>
376:
377: <dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.1 mike 378: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
379: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
380: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
381: <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>
382: <dd><a href="content-models.html#palpable-content">Palpable content</a>.</dd>
1.25 mike 383: <dt><a href="element-definitions.html#element-dfn-contexts" title="element-dfn-contexts">Contexts in which this element can be used</a>:</dt>
1.1 mike 384: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1.25 mike 385: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 386: <dd><a href="content-models.html#text-content" title="text content">Text</a>.</dd>
1.25 mike 387: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 388: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
389: <dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
390: <dd><code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code></dd>
391: <dd><code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code></dd>
392: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
393: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
394: <dd><code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code></dd>
395: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
396: <dd><code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code></dd>
397: <dd><code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code></dd>
398: <dd><code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code></dd>
399: <dd><code title="attr-textarea-rows"><a href="#attr-textarea-rows">rows</a></code></dd>
400: <dd><code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code></dd>
1.25 mike 401: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt>
1.1 mike 402: <dd>
403: <pre class="idl">interface <dfn id="htmltextareaelement">HTMLTextAreaElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
404: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
405: attribute unsigned long <a href="#dom-textarea-cols" title="dom-textarea-cols">cols</a>;
406: attribute DOMString <a href="#dom-textarea-dirname" title="dom-textarea-dirName">dirName</a>;
407: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
408: readonly attribute <a href="the-form-element.html#htmlformelement">HTMLFormElement</a>? <a href="association-of-controls-and-forms.html#dom-fae-form" title="dom-fae-form">form</a>;
409: attribute long <a href="#dom-textarea-maxlength" title="dom-textarea-maxLength">maxLength</a>;
410: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
411: attribute DOMString <a href="#dom-textarea-placeholder" title="dom-textarea-placeholder">placeholder</a>;
412: attribute boolean <a href="#dom-textarea-readonly" title="dom-textarea-readOnly">readOnly</a>;
413: attribute boolean <a href="#dom-textarea-required" title="dom-textarea-required">required</a>;
414: attribute unsigned long <a href="#dom-textarea-rows" title="dom-textarea-rows">rows</a>;
415: attribute DOMString <a href="#dom-textarea-wrap" title="dom-textarea-wrap">wrap</a>;
416:
417: readonly attribute DOMString <a href="#dom-textarea-type" title="dom-textarea-type">type</a>;
418: attribute DOMString <a href="#dom-textarea-defaultvalue" title="dom-textarea-defaultValue">defaultValue</a>;
419: attribute DOMString <a href="#dom-textarea-value" title="dom-textarea-value">value</a>;
420: readonly attribute unsigned long <a href="#dom-textarea-textlength" title="dom-textarea-textLength">textLength</a>;
421:
422: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
423: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
424: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
425: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
426: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
427:
428: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
429:
430: void <a href="textFieldSelection.html#dom-textarea-input-select" title="dom-textarea/input-select">select</a>();
431: attribute unsigned long <a href="textFieldSelection.html#dom-textarea-input-selectionstart" title="dom-textarea/input-selectionStart">selectionStart</a>;
432: attribute unsigned long <a href="textFieldSelection.html#dom-textarea-input-selectionend" title="dom-textarea/input-selectionEnd">selectionEnd</a>;
433: attribute DOMString <a href="textFieldSelection.html#dom-textarea-input-selectiondirection" title="dom-textarea/input-selectionDirection">selectionDirection</a>;
434: void <a href="textFieldSelection.html#dom-textarea-input-setselectionrange" title="dom-textarea/input-setSelectionRange">setSelectionRange</a>(unsigned long start, unsigned long end, optional DOMString direction);
435: };</pre>
436: </dd>
437: </dl><p>The <code><a href="#the-textarea-element">textarea</a></code> element <a href="rendering.html#represents">represents</a> a
438: multiline plain text edit control<span class="impl"> for the
439: element's <dfn id="concept-textarea-raw-value" title="concept-textarea-raw-value">raw
440: value</dfn></span>. The contents of the control represent the
1.85 mike 441: control's default value.</p>
442:
443: <div class="impl">
1.1 mike 444:
445: <p>The <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> of
446: a <code><a href="#the-textarea-element">textarea</a></code> control must be initially the empty
447: string.</p>
448:
449: <p>A newline in a <code><a href="#the-textarea-element">textarea</a></code> element, and in its <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a>, should separate
450: paragraphs for the purposes of the Unicode bidirectional algorithm.
451: This requirement may be implemented indirectly through the style
452: layer. For example, an HTML+CSS user agent could implement these
453: requirements by implementing the CSS 'unicode-bidi' property. <a href="references.html#refsBIDI">[BIDI]</a> <a href="references.html#refsCSS">[CSS]</a></p>
454:
1.85 mike 455: </div>
456:
457: <p>The <dfn id="attr-textarea-readonly" title="attr-textarea-readonly"><code>readonly</code></dfn> attribute
1.1 mike 458: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a> used to control whether the text
1.85 mike 459: can be edited by the user or not.</p>
460:
461: <div class="impl">
1.1 mike 462:
463: <p><strong>Constraint validation</strong>: If the <code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code> attribute is
464: specified on a <code><a href="#the-textarea-element">textarea</a></code> element, the element is
465: <a href="constraints.html#barred-from-constraint-validation">barred from constraint validation</a>.</p>
466:
467: <p>A <code><a href="#the-textarea-element">textarea</a></code> element is <dfn id="concept-textarea-mutable" title="concept-textarea-mutable">mutable</dfn> if it is neither
468: <a href="attributes-common-to-form-controls.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a> nor has a <code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code> attribute
469: specified.</p>
470:
471: <p>When a <code><a href="#the-textarea-element">textarea</a></code> is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, its <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> should be
472: editable by the user: the user agent should allow the user to edit,
473: insert, and remove text, and to insert and remove line breaks in the
1.85 mike 474: form of "LF" (U+000A) characters. Any time the user causes
1.1 mike 475: the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
476: value</a> to change, the user agent must <a href="webappapis.html#queue-a-task">queue a
477: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
478: <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
479: element. User agents may wait for a suitable break in the user's
480: interaction before queuing the task; for example, a user agent could
481: wait for the user to have not hit a key for 100ms, so as to only
482: fire the event when the user pauses, instead of continuously for
483: each keystroke.</p>
1.4 mike 484:
1.1 mike 485: <p>A <code><a href="#the-textarea-element">textarea</a></code> element has a <dfn id="concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</dfn>, which must be
486: initially set to false, and must be set to true whenever the user
487: interacts with the control in a way that changes the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a>.</p>
488:
489: <p>When the <code><a href="#the-textarea-element">textarea</a></code> element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
490: IDL attribute changes value, if the element's <a href="#concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</a> is false,
491: then the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
492: value</a> must be set to the value of the element's
493: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute.</p>
494:
495: <p>The <a href="form-submission.html#concept-form-reset-control" title="concept-form-reset-control">reset
496: algorithm</a> for <code><a href="#the-textarea-element">textarea</a></code> elements is to set the
497: element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">value</a> to
498: the value of the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
499: attribute.</p>
500:
501:
502:
503: <p>If the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, the user agent
504: should allow the user to change the writing direction of the
505: element, setting it either to a left-to-right writing direction or a
506: right-to-left writing direction. If the user does so, the user agent
507: must then run the following steps:</p>
508:
509: <ol><li><p>Set the element's <code title="attr-dir"><a href="global-attributes.html#the-dir-attribute">dir</a></code>
510: attribute to "<code title="attr-dir-ltr"><a href="global-attributes.html#attr-dir-ltr">ltr</a></code>" if the user
511: selected a left-to-right writing direction, and "<code title="attr-dir-rtl"><a href="global-attributes.html#attr-dir-rtl">rtl</a></code>" if the user selected a
512: right-to-left writing direction.</p></li>
513:
514: <li><p><a href="webappapis.html#queue-a-task">Queue a task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple
515: event</a> that bubbles named <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
516: element.</p></li>
517:
1.85 mike 518: </ol></div>
519:
520: <p>The <dfn id="attr-textarea-cols" title="attr-textarea-cols"><code>cols</code></dfn>
1.1 mike 521: attribute specifies the expected maximum number of characters per
522: line. If the <code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code> attribute
523: is specified, its value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative
524: integer</a> greater than zero. <span class="impl">If applying the
525: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the
526: attribute's value results in a number greater than zero, then the
527: element's <dfn id="attr-textarea-cols-value" title="attr-textarea-cols-value">character
1.85 mike 528: width</dfn> is that value; otherwise, it is 20.</span></p>
529:
530: <div class="impl">
1.1 mike 531:
532: <p>The user agent may use the <code><a href="#the-textarea-element">textarea</a></code> element's <a href="#attr-textarea-cols-value" title="attr-textarea-cols-value">character width</a> as a hint to
533: the user as to how many characters the server prefers per line
534: (e.g. for visual user agents by making the width of the control be
535: that many characters). In visual renderings, the user agent should
536: wrap the user's input in the rendering so that each line is no wider
537: than this number of characters.</p>
538:
1.85 mike 539: </div>
540:
541: <p>The <dfn id="attr-textarea-rows" title="attr-textarea-rows"><code>rows</code></dfn>
1.1 mike 542: 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
543: value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a> greater than
544: zero. <span class="impl">If applying the <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing
545: non-negative integers</a> to the attribute's value results in a
546: number greater than zero, then the element's <dfn id="attr-textarea-rows-value" title="attr-textarea-rows-value">character height</dfn> is that
1.85 mike 547: value; otherwise, it is 2.</span></p>
548:
549: <div class="impl">
1.1 mike 550:
551: <p>Visual user agents should set the height of the control to the
552: number of lines given by <a href="#attr-textarea-rows-value" title="attr-textarea-rows-value">character height</a>.</p>
553:
1.85 mike 554: </div>
555:
556: <p>The <dfn id="attr-textarea-wrap" title="attr-textarea-wrap"><code>wrap</code></dfn>
1.1 mike 557: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a> with two keywords
558: and states: the <dfn id="attr-textarea-wrap-soft" title="attr-textarea-wrap-soft"><code>soft</code></dfn> keyword
559: which maps to the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state, and the
560: <dfn id="attr-textarea-wrap-hard" title="attr-textarea-wrap-hard"><code>hard</code></dfn> keyword
561: which maps to the <a href="#attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</a> state. The
1.85 mike 562: <i>missing value default</i> is the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state.</p>
563:
564: <p>The <dfn id="attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</dfn> state
1.1 mike 565: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is not to be
566: wrapped when it is submitted (though it can still be wrapped in the
1.85 mike 567: rendering).</p>
568:
569: <p>The <dfn id="attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</dfn> state
1.1 mike 570: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is to have
571: newlines added by the user agent so that the text is wrapped when it
1.85 mike 572: is submitted.</p>
573:
574: <p>If the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code>
1.1 mike 575: 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
1.85 mike 576: specified.</p>
577:
578:
579:
580: <div class="impl">
1.1 mike 581:
582: <p>For historical reasons, the element's value is normalised in
583: three different ways for three different purposes. The <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> is the value as
584: it was originally set. It is not normalized. The <a href="#concept-textarea-api-value" title="concept-textarea-api-value">API value</a> is the value
585: used in the <code title="dom-textarea-value"><a href="#dom-textarea-value">value</a></code> IDL
1.85 mike 586: attribute. It is normalized so that line breaks use "LF" (U+000A) characters. Finally, there is the form submission <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>. It is normalized so that line
1.1 mike 587: breaks use U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character
588: pairs, and in addition, if necessary given the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code> attribute, additional line
589: breaks are inserted to wrap the text at the given width.</p>
590:
591: <p>The element's <dfn id="concept-textarea-api-value" title="concept-textarea-api-value">API
592: value</dfn> is defined to be the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with the
593: following transformation applied:</p>
594:
595: <ol><li><p>Replace every U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
596: character pair from the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with a single
597: U+000A LINE FEED (CRLF) character.</p></li>
598:
599: <li><p>Replace every remaining U+000D CARRIAGE RETURN character from
600: the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with
601: a single U+000A LINE FEED (CRLF) character.</p></li>
602:
603: </ol><p>The element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
604: defined to be the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with the
605: following transformation applied:</p>
606:
1.85 mike 607: <ol><li><p>Replace every occurrence of a "CR" (U+000D)
608: character not followed by a "LF" (U+000A) character, and
609: every occurrence of a "LF" (U+000A) character not preceded
610: by a "CR" (U+000D) character, by a two-character
1.1 mike 611: string consisting of a U+000D CARRIAGE RETURN U+000A LINE FEED
612: (CRLF) character pair.</p></li>
613:
614: <li><p>If the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code> attribute is in the <a href="#attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</a> state, insert
615: U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pairs
616: into the string using a UA-defined algorithm so that each line has
617: no more than <a href="#attr-textarea-cols-value" title="attr-textarea-cols-value">character
618: width</a> characters. For the purposes of this requirement,
619: lines are delimited by the start of the string, the end of the
620: string, and U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
621: character pairs.</p></li>
622:
1.85 mike 623: </ol></div>
624:
625: <p>The <dfn id="attr-textarea-maxlength" title="attr-textarea-maxlength"><code>maxlength</code></dfn>
1.1 mike 626: attribute is a <a href="attributes-common-to-form-controls.html#attr-fe-maxlength" title="attr-fe-maxlength">form control <code title="">maxlength</code> attribute</a> controlled by the
1.85 mike 627: <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>
628:
629: <p>If the <code><a href="#the-textarea-element">textarea</a></code> element has a <a href="attributes-common-to-form-controls.html#maximum-allowed-value-length">maximum allowed
1.1 mike 630: value length</a>, then the element's children must be such that
631: the <a href="infrastructure.html#code-point-length">code-point length</a> of the value of the element's
632: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute is equal to or less than the
1.85 mike 633: element's <a href="attributes-common-to-form-controls.html#maximum-allowed-value-length">maximum allowed value length</a>.</p>
634:
635: <p>The <dfn id="attr-textarea-required" title="attr-textarea-required"><code>required</code></dfn> attribute
1.1 mike 636: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the user will
1.85 mike 637: be required to enter a value before submitting the form.</p>
638:
639: <div class="impl">
1.1 mike 640:
641: <p><strong>Constraint validation</strong>: If the element has its
642: <code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code> attribute
643: specified, and the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, and the element's
644: <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is the empty string,
645: then the element is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
646:
1.85 mike 647: </div>
648:
649:
650:
651:
652: <p>The <dfn id="attr-textarea-placeholder" title="attr-textarea-placeholder"><code>placeholder</code></dfn>
1.1 mike 653: attribute represents a hint (a word or short phrase) intended to aid
654: the user with data entry. A hint could be a sample value or a brief
655: description of the expected format. The attribute, if specified,
1.85 mike 656: must have a value that contains no "LF" (U+000A) or "CR" (U+000D) characters.</p>
657:
658: <p class="note">For a longer hint or other advisory text, the <code title="attr-title"><a href="global-attributes.html#the-title-attribute">title</a></code> attribute is more appropriate.</p>
659:
660: <p>The <code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code>
1.1 mike 661: attribute should not be used as an alternative to a
1.85 mike 662: <code><a href="the-label-element.html#the-label-element">label</a></code>.</p>
663:
664: <div class="impl">
1.1 mike 665:
666: <p>User agents should present this hint to the user, after having
667: <a href="common-microsyntaxes.html#strip-line-breaks" title="strip line breaks">stripped line breaks</a> from it,
668: when the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
669: the empty string and the control is not focused (e.g. by displaying
670: it inside a blank unfocused control).</p>
671:
1.85 mike 672: </div>
673:
674: <p>The <dfn id="attr-textarea-dirname" title="attr-textarea-dirname"><code>dirname</code></dfn>
1.1 mike 675: attribute is a <a href="attributes-common-to-form-controls.html#form-control-dirname-attribute">form control <code title="">dirname</code>
1.85 mike 676: attribute</a>.</p>
677:
678: <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
1.1 mike 679: explicitly associate the <code><a href="#the-textarea-element">textarea</a></code> element with its
680: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code>
681: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code> attribute is used to make
682: the control non-interactive and to prevent its value from being
683: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
1.85 mike 684: attribute controls focus.</p>
685:
686:
687: <dl class="domintro"><dt><var title="">textarea</var> . <code title="attr-textarea-type">type</code></dt>
1.1 mike 688:
689: <dd>
690:
691: <p>Returns the string "<code title="">textarea</code>".</p>
692:
693: </dd>
694:
695: <dt><var title="">textarea</var> . <code title="attr-textarea-value">value</code></dt>
696:
697: <dd>
698:
699: <p>Returns the current value of the element.</p>
700:
701: <p>Can be set, to change the value.</p>
702:
703: </dd>
704:
705: </dl><div class="impl">
706:
707: <p>The <dfn id="dom-textarea-cols" title="dom-textarea-cols"><code>cols</code></dfn>, <dfn id="dom-textarea-placeholder" title="dom-textarea-placeholder"><code>placeholder</code></dfn>,
708: <dfn id="dom-textarea-required" title="dom-textarea-required"><code>required</code></dfn>, <dfn id="dom-textarea-rows" title="dom-textarea-rows"><code>rows</code></dfn>, and <dfn id="dom-textarea-wrap" title="dom-textarea-wrap"><code>wrap</code></dfn> attributes must
709: <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the same
710: name. The <code title="dom-textarea-cols"><a href="#dom-textarea-cols">cols</a></code> and <code title="dom-textarea-rows"><a href="#dom-textarea-rows">rows</a></code> attributes are <a href="common-dom-interfaces.html#limited-to-only-non-negative-numbers-greater-than-zero">limited
711: to only non-negative numbers greater than zero</a>. The <code title="dom-textarea-cols"><a href="#dom-textarea-cols">cols</a></code> attribute's default value is
712: 20. The <code title="dom-textarea-rows"><a href="#dom-textarea-rows">rows</a></code> attribute's
713: default value is 2. The <dfn id="dom-textarea-dirname" title="dom-textarea-dirName"><code>dirName</code></dfn> IDL
714: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the <code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code> content attribute. The
715: <dfn id="dom-textarea-maxlength" title="dom-textarea-maxLength"><code>maxLength</code></dfn> IDL
716: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the <code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code> content attribute,
717: <a href="common-dom-interfaces.html#limited-to-only-non-negative-numbers">limited to only non-negative numbers</a>. The <dfn id="dom-textarea-readonly" title="dom-textarea-readOnly"><code>readOnly</code></dfn> IDL
718: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the <code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code> content
719: attribute.</p>
720:
721: <p>The <dfn id="dom-textarea-type" title="dom-textarea-type"><code>type</code></dfn> IDL
722: attribute must return the value "<code title="">textarea</code>".</p>
723:
724: <p>The <dfn id="dom-textarea-defaultvalue" title="dom-textarea-defaultValue"><code>defaultValue</code></dfn>
725: IDL attribute must act like the element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
726: IDL attribute.</p>
727:
728: <p>The <dfn id="dom-textarea-value" title="dom-textarea-value"><code>value</code></dfn>
729: attribute must, on getting, return the element's <a href="#concept-textarea-api-value" title="concept-textarea-api-value">API value</a>; on setting, it
730: must set the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
731: value</a> to the new value, set the element's <a href="#concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</a> to true, and
732: should then move the text entry cursor position to the end of the
733: text field, unselecting any selected text and resetting the
734: selection direction to <i>none</i>.</p>
735:
736: <p>The <dfn id="dom-textarea-textlength" title="dom-textarea-textLength"><code>textLength</code></dfn> IDL
737: attribute must return the <a href="infrastructure.html#code-point-length">code-point length</a> of the
738: element's <a href="#concept-textarea-api-value" title="concept-textarea-api-value">API
739: value</a>.</p>
740:
741: <p>The <code title="dom-cva-willValidate"><a href="constraints.html#dom-cva-willvalidate">willValidate</a></code>, <code title="dom-cva-validity"><a href="constraints.html#dom-cva-validity">validity</a></code>, and <code title="dom-cva-validationMessage"><a href="constraints.html#dom-cva-validationmessage">validationMessage</a></code>
742: attributes, and the <code title="dom-cva-checkValidatity"><a href="constraints.html#dom-cva-checkvalidatity">checkValidity()</a></code> and <code title="dom-cva-setCustomValidity"><a href="constraints.html#dom-cva-setcustomvalidity">setCustomValidity()</a></code>
743: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
744: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
745: of the element's <code><a href="the-label-element.html#the-label-element">label</a></code>s. The <code title="dom-textarea/input-select"><a href="textFieldSelection.html#dom-textarea-input-select">select()</a></code>, <code title="dom-textarea/input-selectionStart"><a href="textFieldSelection.html#dom-textarea-input-selectionstart">selectionStart</a></code>,
746: <code title="dom-textarea/input-selectionEnd"><a href="textFieldSelection.html#dom-textarea-input-selectionend">selectionEnd</a></code>,
747: <code title="dom-textarea/input-selectionDirection"><a href="textFieldSelection.html#dom-textarea-input-selectiondirection">selectionDirection</a></code>,
748: and <code title="dom-textarea/input-setSelectionRange"><a href="textFieldSelection.html#dom-textarea-input-setselectionrange">setSelectionRange()</a></code>
749: methods and attributes expose the element's text selection. The
750: <code title="dom-fe-autofocus"><a href="attributes-common-to-form-controls.html#dom-fe-autofocus">autofocus</a></code>, <code title="dom-fe-disabled"><a href="attributes-common-to-form-controls.html#dom-fe-disabled">disabled</a></code>, <code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code>, and <code title="dom-fe-name"><a href="attributes-common-to-form-controls.html#dom-fe-name">name</a></code> IDL attributes are part of the
751: element's forms API.</p>
752:
1.85 mike 753: </div>
754:
755:
756: <div class="example">
1.1 mike 757:
758: <p>Here is an example of a <code><a href="#the-textarea-element">textarea</a></code> being used for
759: unrestricted free-form text input in a form:</p>
760:
761: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments></textarea></p></pre>
762:
763: <p>To specify a maximum length for the comments, one can use
764: the <code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code>
765: attribute:</p>
766:
767: <pre><p>If you have any short comments, please let us know: <textarea cols=80 name=comments maxlength=200></textarea></p></pre>
768:
769: <p>To give a default value, text can be included inside the element:</p>
770:
771: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments>You rock!</textarea></p></pre>
772:
773: <p>To have the browser submit <a href="global-attributes.html#the-directionality">the directionality</a> of
774: the element along with the value, the <code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code> attribute can be
775: specified:</p>
776:
777: <pre><p>If you have any comments, please let us know (you may use either English or Hebrew for your comments):
778: <textarea cols=80 name=comments dirname=comments.dir></textarea></p></pre>
779:
1.85 mike 780: </div>
781:
782:
783:
784: </body></html>
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