Annotation of html5/spec/the-textarea-element.html, revision 1.62
1.1 mike 1: <!DOCTYPE html>
2: <html lang="en-US-x-Hixie"><head><title>4.10.13 The textarea element — HTML5</title><style type="text/css">
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186: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
187: #configUI p label { display: block; }
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189: #configUI input[type=button] { display: block; margin: auto; }
190:
191: fieldset { margin: 1em; padding: 0.5em 1em; }
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196: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><style type="text/css">
197:
198: .applies thead th > * { display: block; }
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207: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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231: .apple-table-examples * { font-family: "Times", serif; }
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235: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
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238: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
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241: .apple-table-examples sup { line-height: 0; }
242:
243: .details-example img { vertical-align: top; }
244:
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254: -webkit-column-width: 6em;
255: -webkit-column-count: 5;
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263: #named-character-references-table {
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273: #named-character-references-table > table > tbody > tr > td:first-child + td,
274: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
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277:
278: .glyph.control { color: red; }
279:
280: @font-face {
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299: }
300:
301: </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">
302: function getCookie(name) {
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304: for (var index = 0; index < params.length; index++) {
305: if (params[index] == name)
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310: }
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314: if (data[0] == name)
315: return unescape(data[1]);
316: }
317: return null;
318: }
319: </script>
320: <script src="link-fixup.js"></script>
321: <link href="the-option-element.html" title="4.10.12 The option element" rel="prev">
322: <link href="index.html#contents" title="Table of contents" rel="contents">
323: <link href="the-keygen-element.html" title="4.10.14 The keygen element" rel="next">
1.22 mike 324: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 325: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
326:
327: <h1>HTML5</h1>
1.62 ! mike 328: <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 1.5578.</p>
1.1 mike 329:
1.62 ! mike 330: <h2 class="no-num no-toc" id="editor-s-draft-9-february-2012">Editor's Draft 9 February 2012</h2>
1.1 mike 331: </div><nav class="prev_next">
332: <a href="the-option-element.html">← 4.10.12 The option element</a> –
333: <a href="index.html#contents">Table of contents</a> –
334: <a href="the-keygen-element.html">4.10.14 The keygen element →</a>
335: </nav>
336:
1.25 mike 337: <h4 id="the-textarea-element"><span class="secno">4.10.13 </span>The <dfn><code>textarea</code></dfn> element</h4><dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.1 mike 338: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
339: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
340: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
341: <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>
342: <dd><a href="content-models.html#palpable-content">Palpable content</a>.</dd>
1.25 mike 343: <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 344: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1.25 mike 345: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 346: <dd><a href="content-models.html#text-content" title="text content">Text</a>.</dd>
1.25 mike 347: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 348: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
349: <dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
350: <dd><code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code></dd>
351: <dd><code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code></dd>
352: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
353: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
354: <dd><code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code></dd>
355: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
356: <dd><code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code></dd>
357: <dd><code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code></dd>
358: <dd><code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code></dd>
359: <dd><code title="attr-textarea-rows"><a href="#attr-textarea-rows">rows</a></code></dd>
360: <dd><code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code></dd>
1.25 mike 361: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt>
1.1 mike 362: <dd>
363: <pre class="idl">interface <dfn id="htmltextareaelement">HTMLTextAreaElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
364: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
365: attribute unsigned long <a href="#dom-textarea-cols" title="dom-textarea-cols">cols</a>;
366: attribute DOMString <a href="#dom-textarea-dirname" title="dom-textarea-dirName">dirName</a>;
367: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
368: 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>;
369: attribute long <a href="#dom-textarea-maxlength" title="dom-textarea-maxLength">maxLength</a>;
370: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
371: attribute DOMString <a href="#dom-textarea-placeholder" title="dom-textarea-placeholder">placeholder</a>;
372: attribute boolean <a href="#dom-textarea-readonly" title="dom-textarea-readOnly">readOnly</a>;
373: attribute boolean <a href="#dom-textarea-required" title="dom-textarea-required">required</a>;
374: attribute unsigned long <a href="#dom-textarea-rows" title="dom-textarea-rows">rows</a>;
375: attribute DOMString <a href="#dom-textarea-wrap" title="dom-textarea-wrap">wrap</a>;
376:
377: readonly attribute DOMString <a href="#dom-textarea-type" title="dom-textarea-type">type</a>;
378: attribute DOMString <a href="#dom-textarea-defaultvalue" title="dom-textarea-defaultValue">defaultValue</a>;
379: attribute DOMString <a href="#dom-textarea-value" title="dom-textarea-value">value</a>;
380: readonly attribute unsigned long <a href="#dom-textarea-textlength" title="dom-textarea-textLength">textLength</a>;
381:
382: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
383: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
384: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
385: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
386: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
387:
388: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
389:
390: void <a href="textFieldSelection.html#dom-textarea-input-select" title="dom-textarea/input-select">select</a>();
391: attribute unsigned long <a href="textFieldSelection.html#dom-textarea-input-selectionstart" title="dom-textarea/input-selectionStart">selectionStart</a>;
392: attribute unsigned long <a href="textFieldSelection.html#dom-textarea-input-selectionend" title="dom-textarea/input-selectionEnd">selectionEnd</a>;
393: attribute DOMString <a href="textFieldSelection.html#dom-textarea-input-selectiondirection" title="dom-textarea/input-selectionDirection">selectionDirection</a>;
394: 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);
395: };</pre>
396: </dd>
397: </dl><p>The <code><a href="#the-textarea-element">textarea</a></code> element <a href="rendering.html#represents">represents</a> a
398: multiline plain text edit control<span class="impl"> for the
399: element's <dfn id="concept-textarea-raw-value" title="concept-textarea-raw-value">raw
400: value</dfn></span>. The contents of the control represent the
401: control's default value.</p><div class="impl">
402:
403: <p>The <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> of
404: a <code><a href="#the-textarea-element">textarea</a></code> control must be initially the empty
405: string.</p>
406:
407: <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
408: paragraphs for the purposes of the Unicode bidirectional algorithm.
409: This requirement may be implemented indirectly through the style
410: layer. For example, an HTML+CSS user agent could implement these
411: requirements by implementing the CSS 'unicode-bidi' property. <a href="references.html#refsBIDI">[BIDI]</a> <a href="references.html#refsCSS">[CSS]</a></p>
412:
413: </div><p>The <dfn id="attr-textarea-readonly" title="attr-textarea-readonly"><code>readonly</code></dfn> attribute
414: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a> used to control whether the text
415: can be edited by the user or not.</p><div class="impl">
416:
417: <p><strong>Constraint validation</strong>: If the <code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code> attribute is
418: specified on a <code><a href="#the-textarea-element">textarea</a></code> element, the element is
419: <a href="constraints.html#barred-from-constraint-validation">barred from constraint validation</a>.</p>
420:
421: <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
422: <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
423: specified.</p>
424:
425: <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
426: editable by the user: the user agent should allow the user to edit,
427: insert, and remove text, and to insert and remove line breaks in the
428: form of U+000A LINE FEED (LF) characters. Any time the user causes
429: the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
430: value</a> to change, the user agent must <a href="webappapis.html#queue-a-task">queue a
431: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
432: <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
433: element. User agents may wait for a suitable break in the user's
434: interaction before queuing the task; for example, a user agent could
435: wait for the user to have not hit a key for 100ms, so as to only
436: fire the event when the user pauses, instead of continuously for
437: each keystroke.</p>
1.4 mike 438:
1.1 mike 439: <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
440: initially set to false, and must be set to true whenever the user
441: 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>
442:
443: <p>When the <code><a href="#the-textarea-element">textarea</a></code> element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
444: IDL attribute changes value, if the element's <a href="#concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</a> is false,
445: then the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
446: value</a> must be set to the value of the element's
447: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute.</p>
448:
449: <p>The <a href="form-submission.html#concept-form-reset-control" title="concept-form-reset-control">reset
450: algorithm</a> for <code><a href="#the-textarea-element">textarea</a></code> elements is to set the
451: element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">value</a> to
452: the value of the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
453: attribute.</p>
454:
455:
456:
457: <p>If the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, the user agent
458: should allow the user to change the writing direction of the
459: element, setting it either to a left-to-right writing direction or a
460: right-to-left writing direction. If the user does so, the user agent
461: must then run the following steps:</p>
462:
463: <ol><li><p>Set the element's <code title="attr-dir"><a href="global-attributes.html#the-dir-attribute">dir</a></code>
464: attribute to "<code title="attr-dir-ltr"><a href="global-attributes.html#attr-dir-ltr">ltr</a></code>" if the user
465: 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
466: right-to-left writing direction.</p></li>
467:
468: <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
469: event</a> that bubbles named <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
470: element.</p></li>
471:
472: </ol></div><p>The <dfn id="attr-textarea-cols" title="attr-textarea-cols"><code>cols</code></dfn>
473: attribute specifies the expected maximum number of characters per
474: line. If the <code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code> attribute
475: is specified, its value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative
476: integer</a> greater than zero. <span class="impl">If applying the
477: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the
478: attribute's value results in a number greater than zero, then the
479: element's <dfn id="attr-textarea-cols-value" title="attr-textarea-cols-value">character
480: width</dfn> is that value; otherwise, it is 20.</span></p><div class="impl">
481:
482: <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
483: the user as to how many characters the server prefers per line
484: (e.g. for visual user agents by making the width of the control be
485: that many characters). In visual renderings, the user agent should
486: wrap the user's input in the rendering so that each line is no wider
487: than this number of characters.</p>
488:
489: </div><p>The <dfn id="attr-textarea-rows" title="attr-textarea-rows"><code>rows</code></dfn>
490: 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
491: value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a> greater than
492: zero. <span class="impl">If applying the <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing
493: non-negative integers</a> to the attribute's value results in a
494: number greater than zero, then the element's <dfn id="attr-textarea-rows-value" title="attr-textarea-rows-value">character height</dfn> is that
495: value; otherwise, it is 2.</span></p><div class="impl">
496:
497: <p>Visual user agents should set the height of the control to the
498: number of lines given by <a href="#attr-textarea-rows-value" title="attr-textarea-rows-value">character height</a>.</p>
499:
500: </div><p>The <dfn id="attr-textarea-wrap" title="attr-textarea-wrap"><code>wrap</code></dfn>
501: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a> with two keywords
502: and states: the <dfn id="attr-textarea-wrap-soft" title="attr-textarea-wrap-soft"><code>soft</code></dfn> keyword
503: which maps to the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state, and the
504: <dfn id="attr-textarea-wrap-hard" title="attr-textarea-wrap-hard"><code>hard</code></dfn> keyword
505: which maps to the <a href="#attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</a> state. The
506: <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>The <dfn id="attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</dfn> state
507: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is not to be
508: wrapped when it is submitted (though it can still be wrapped in the
509: rendering).</p><p>The <dfn id="attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</dfn> state
510: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is to have
511: newlines added by the user agent so that the text is wrapped when it
512: is submitted.</p><p>If the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code>
513: 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
514: specified.</p><div class="impl">
515:
516: <p>For historical reasons, the element's value is normalised in
517: 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
518: 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
519: used in the <code title="dom-textarea-value"><a href="#dom-textarea-value">value</a></code> IDL
520: attribute. It is normalized so that line breaks use U+000A LINE FEED
521: (LF) 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
522: breaks use U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character
523: 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
524: breaks are inserted to wrap the text at the given width.</p>
525:
526: <p>The element's <dfn id="concept-textarea-api-value" title="concept-textarea-api-value">API
527: 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
528: following transformation applied:</p>
529:
530: <ol><li><p>Replace every U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
531: character pair from the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with a single
532: U+000A LINE FEED (CRLF) character.</p></li>
533:
534: <li><p>Replace every remaining U+000D CARRIAGE RETURN character from
535: the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with
536: a single U+000A LINE FEED (CRLF) character.</p></li>
537:
538: </ol><p>The element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
539: defined to be the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with the
540: following transformation applied:</p>
541:
542: <ol><li><p>Replace every occurrence of a U+000D CARRIAGE RETURN (CR)
543: character not followed by a U+000A LINE FEED (LF) character, and
544: every occurrence of a U+000A LINE FEED (LF) character not preceded
545: by a U+000D CARRIAGE RETURN (CR) character, by a two-character
546: string consisting of a U+000D CARRIAGE RETURN U+000A LINE FEED
547: (CRLF) character pair.</p></li>
548:
549: <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
550: U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pairs
551: into the string using a UA-defined algorithm so that each line has
552: no more than <a href="#attr-textarea-cols-value" title="attr-textarea-cols-value">character
553: width</a> characters. For the purposes of this requirement,
554: lines are delimited by the start of the string, the end of the
555: string, and U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
556: character pairs.</p></li>
557:
558: </ol></div><p>The <dfn id="attr-textarea-maxlength" title="attr-textarea-maxlength"><code>maxlength</code></dfn>
559: 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
560: <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="attributes-common-to-form-controls.html#maximum-allowed-value-length">maximum allowed
561: value length</a>, then the element's children must be such that
562: the <a href="infrastructure.html#code-point-length">code-point length</a> of the value of the element's
563: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute is equal to or less than the
564: element's <a href="attributes-common-to-form-controls.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
565: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the user will
566: be required to enter a value before submitting the form.</p><div class="impl">
567:
568: <p><strong>Constraint validation</strong>: If the element has its
569: <code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code> attribute
570: specified, and the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, and the element's
571: <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is the empty string,
572: then the element is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
573:
574: </div><p>The <dfn id="attr-textarea-placeholder" title="attr-textarea-placeholder"><code>placeholder</code></dfn>
575: attribute represents a hint (a word or short phrase) intended to aid
576: the user with data entry. A hint could be a sample value or a brief
577: description of the expected format. The attribute, if specified,
578: must have a value that contains no U+000A LINE FEED (LF) or U+000D
579: CARRIAGE RETURN (CR) characters.</p><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><p>The <code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code>
580: attribute should not be used as an alternative to a
581: <code><a href="the-label-element.html#the-label-element">label</a></code>.</p><div class="impl">
582:
583: <p>User agents should present this hint to the user, after having
584: <a href="common-microsyntaxes.html#strip-line-breaks" title="strip line breaks">stripped line breaks</a> from it,
585: when the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
586: the empty string and the control is not focused (e.g. by displaying
587: it inside a blank unfocused control).</p>
588:
589: </div><p>The <dfn id="attr-textarea-dirname" title="attr-textarea-dirname"><code>dirname</code></dfn>
590: attribute is a <a href="attributes-common-to-form-controls.html#form-control-dirname-attribute">form control <code title="">dirname</code>
591: attribute</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
592: explicitly associate the <code><a href="#the-textarea-element">textarea</a></code> element with its
593: <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>
594: 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
595: the control non-interactive and to prevent its value from being
596: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
597: attribute controls focus.</p><dl class="domintro"><dt><var title="">textarea</var> . <code title="attr-textarea-type">type</code></dt>
598:
599: <dd>
600:
601: <p>Returns the string "<code title="">textarea</code>".</p>
602:
603: </dd>
604:
605: <dt><var title="">textarea</var> . <code title="attr-textarea-value">value</code></dt>
606:
607: <dd>
608:
609: <p>Returns the current value of the element.</p>
610:
611: <p>Can be set, to change the value.</p>
612:
613: </dd>
614:
615: </dl><div class="impl">
616:
617: <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>,
618: <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
619: <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the same
620: 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
621: 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
622: 20. The <code title="dom-textarea-rows"><a href="#dom-textarea-rows">rows</a></code> attribute's
623: default value is 2. The <dfn id="dom-textarea-dirname" title="dom-textarea-dirName"><code>dirName</code></dfn> IDL
624: 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
625: <dfn id="dom-textarea-maxlength" title="dom-textarea-maxLength"><code>maxLength</code></dfn> IDL
626: 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,
627: <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
628: 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
629: attribute.</p>
630:
631: <p>The <dfn id="dom-textarea-type" title="dom-textarea-type"><code>type</code></dfn> IDL
632: attribute must return the value "<code title="">textarea</code>".</p>
633:
634: <p>The <dfn id="dom-textarea-defaultvalue" title="dom-textarea-defaultValue"><code>defaultValue</code></dfn>
635: IDL attribute must act like the element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
636: IDL attribute.</p>
637:
638: <p>The <dfn id="dom-textarea-value" title="dom-textarea-value"><code>value</code></dfn>
639: 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
640: must set the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
641: 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
642: should then move the text entry cursor position to the end of the
643: text field, unselecting any selected text and resetting the
644: selection direction to <i>none</i>.</p>
645:
646: <p>The <dfn id="dom-textarea-textlength" title="dom-textarea-textLength"><code>textLength</code></dfn> IDL
647: attribute must return the <a href="infrastructure.html#code-point-length">code-point length</a> of the
648: element's <a href="#concept-textarea-api-value" title="concept-textarea-api-value">API
649: value</a>.</p>
650:
651: <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>
652: 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>
653: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
654: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
655: 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>,
656: <code title="dom-textarea/input-selectionEnd"><a href="textFieldSelection.html#dom-textarea-input-selectionend">selectionEnd</a></code>,
657: <code title="dom-textarea/input-selectionDirection"><a href="textFieldSelection.html#dom-textarea-input-selectiondirection">selectionDirection</a></code>,
658: and <code title="dom-textarea/input-setSelectionRange"><a href="textFieldSelection.html#dom-textarea-input-setselectionrange">setSelectionRange()</a></code>
659: methods and attributes expose the element's text selection. The
660: <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
661: element's forms API.</p>
662:
663: </div><div class="example">
664:
665: <p>Here is an example of a <code><a href="#the-textarea-element">textarea</a></code> being used for
666: unrestricted free-form text input in a form:</p>
667:
668: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments></textarea></p></pre>
669:
670: <p>To specify a maximum length for the comments, one can use
671: the <code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code>
672: attribute:</p>
673:
674: <pre><p>If you have any short comments, please let us know: <textarea cols=80 name=comments maxlength=200></textarea></p></pre>
675:
676: <p>To give a default value, text can be included inside the element:</p>
677:
678: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments>You rock!</textarea></p></pre>
679:
680: <p>To have the browser submit <a href="global-attributes.html#the-directionality">the directionality</a> of
681: the element along with the value, the <code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code> attribute can be
682: specified:</p>
683:
684: <pre><p>If you have any comments, please let us know (you may use either English or Hebrew for your comments):
685: <textarea cols=80 name=comments dirname=comments.dir></textarea></p></pre>
686:
687: </div></body></html>
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