Annotation of html5/spec/the-textarea-element.html, revision 1.180
1.88 mike 1: <!DOCTYPE html>
1.159 sruby 2: <html lang="en-US-x-Hixie"><head><title>4.10.13 The textarea element — HTML5</title><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; }
36: .matrix, .matrix td { border: none; text-align: right; }
37: .matrix { margin-left: 2em; }
38: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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41:
42: .toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
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49: dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
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51: dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
52: dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
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; }
58: dl.triple { padding: 0 0 0 1em; }
59: dl.triple dt, dl.triple dd { margin: 0; display: inline }
60: dl.triple dt:after { content: ':'; }
61: dl.triple dd:after { content: '\A'; white-space: pre; }
62: .diff-old { text-decoration: line-through; color: silver; background: transparent; }
63: .diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
64: a .diff-new { border-bottom: 1px blue solid; }
65:
1.180 ! sruby 66: figure.diagrams { border: double black; background: white; padding: 1em; }
! 67: figure.diagrams img { display: block; margin: 1em auto; }
! 68:
1.1 mike 69: h2 { page-break-before: always; }
70: h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
71: h1 + h2, hr + h2.no-toc { page-break-before: auto; }
72:
73: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
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75:
76: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
77: div.head p { margin: 0; }
78: div.head h1 { margin: 0; }
79: div.head .logo { float: right; margin: 0 1em; }
80: div.head .logo img { border: none } /* remove border from top image */
81: div.head dl { margin: 1em 0; }
82: div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
83:
84: body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
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89:
90: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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92: .brief li p { margin: 0; padding: 0; }
93:
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99: .category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
100:
101: .XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
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127: h4 { position: relative; z-index: 3; }
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153: td > .example:only-child { margin: 0 0 0 0.1em; }
154:
155: ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
156: ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
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167: ul.domTree .t10 code { color: teal; }
168:
169: body.dfnEnabled dfn { cursor: pointer; }
170: .dfnPanel {
171: display: inline;
172: position: absolute;
173: z-index: 10;
174: height: auto;
175: width: auto;
176: padding: 0.5em 0.75em;
177: font: small sans-serif, Droid Sans Fallback;
178: background: #DDDDDD;
179: color: black;
180: border: outset 0.2em;
181: }
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184: .dfnPanel p { font-weight: bolder; }
185: .dfnPanel * + p { margin-top: 0.25em; }
186: .dfnPanel li { list-style-position: inside; }
187:
188: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
189: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
190: #configUI p label { display: block; }
191: #configUI #updateUI, #configUI .loginUI { text-align: center; }
192: #configUI input[type=button] { display: block; margin: auto; }
193:
194: fieldset { margin: 1em; padding: 0.5em 1em; }
195: fieldset > legend + * { margin-top: 0; }
196: fieldset > :last-child { margin-bottom: 0; }
197: fieldset p { margin: 0.5em 0; }
198:
1.159 sruby 199: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><style type="text/css">
1.1 mike 200:
201: .applies thead th > * { display: block; }
202: .applies thead code { display: block; }
203: .applies tbody th { whitespace: nowrap; }
204: .applies td { text-align: center; }
205: .applies .yes { background: yellow; }
206:
207: .matrix, .matrix td { border: hidden; text-align: right; }
208: .matrix { margin-left: 2em; }
209:
210: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
211: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
212: .dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
213:
214: td.eg { border-width: thin; text-align: center; }
215:
216: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
217: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
218: #table-example-1 caption { padding-bottom: 0.5em; }
219: #table-example-1 thead, #table-example-1 tbody { border: none; }
220: #table-example-1 th, #table-example-1 td { border: solid thin; }
221: #table-example-1 th { font-weight: normal; }
222: #table-example-1 td { border-style: none solid; vertical-align: top; }
223: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
224: #table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
225: #table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
226: #table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
227: #table-example-1 tbody td:first-child::after { content: leader(". "); }
228: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
229: #table-example-1 tbody td:first-child + td { width: 10em; }
230: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
231: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
232:
233: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
234: .apple-table-examples * { font-family: "Times", serif; }
235: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
236: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
237: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
238: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
239: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
240: .apple-table-examples td { text-align: right; vertical-align: top; }
241: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
242: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
243: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
244: .apple-table-examples sup { line-height: 0; }
245:
246: .details-example img { vertical-align: top; }
247:
248: #base64-table {
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251: column-width: 6em;
252: column-count: 5;
253: column-gap: 1em;
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255: -moz-column-count: 5;
256: -moz-column-gap: 1em;
257: -webkit-column-width: 6em;
258: -webkit-column-count: 5;
259: -webkit-column-gap: 1em;
260: }
261: #base64-table thead { display: none; }
262: #base64-table * { border: none; }
263: #base64-table tbody td:first-child:after { content: ':'; }
264: #base64-table tbody td:last-child { text-align: right; }
265:
266: #named-character-references-table {
267: white-space: nowrap;
268: font-size: 0.6em;
269: column-width: 30em;
270: column-gap: 1em;
271: -moz-column-width: 30em;
272: -moz-column-gap: 1em;
273: -webkit-column-width: 30em;
274: -webkit-column-gap: 1em;
275: }
276: #named-character-references-table > table > tbody > tr > td:first-child + td,
277: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
278: #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; }
279: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
280:
281: .glyph.control { color: red; }
282:
283: @font-face {
284: font-family: 'Essays1743';
1.178 sruby 285: src: url('../fonts/Essays1743.ttf');
1.1 mike 286: }
287: @font-face {
288: font-family: 'Essays1743';
289: font-weight: bold;
1.178 sruby 290: src: url('../fonts/Essays1743-Bold.ttf');
1.1 mike 291: }
292: @font-face {
293: font-family: 'Essays1743';
294: font-style: italic;
1.178 sruby 295: src: url('../fonts/Essays1743-Italic.ttf');
1.1 mike 296: }
297: @font-face {
298: font-family: 'Essays1743';
299: font-style: italic;
300: font-weight: bold;
1.178 sruby 301: src: url('../fonts/Essays1743-BoldItalic.ttf');
1.1 mike 302: }
303:
1.159 sruby 304: </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>
1.1 mike 305: function getCookie(name) {
306: var params = location.search.substr(1).split("&");
307: for (var index = 0; index < params.length; index++) {
308: if (params[index] == name)
309: return "1";
310: var data = params[index].split("=");
311: if (data[0] == name)
312: return unescape(data[1]);
313: }
314: var cookies = document.cookie.split("; ");
315: for (var index = 0; index < cookies.length; index++) {
316: var data = cookies[index].split("=");
317: if (data[0] == name)
318: return unescape(data[1]);
319: }
320: return null;
321: }
1.159 sruby 322: </script><link href="the-option-element.html" title="4.10.12 The option element" rel="prev">
1.161 sruby 323: <link href="spec.html#contents" title="Table of contents" rel="contents">
1.1 mike 324: <link href="the-keygen-element.html" title="4.10.14 The keygen element" rel="next">
1.22 mike 325: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 326: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
327:
328: <h1>HTML5</h1>
1.159 sruby 329: <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>
1.179 sruby 330: <h2 class="no-num no-toc" id="editor's-draft-date-1-january-1970">Editor's Draft 18 September 2012</h2>
1.85 mike 331: </div>
1.174 sruby 332: <div class="prev_next">
1.1 mike 333: <a href="the-option-element.html">← 4.10.12 The option element</a> –
1.161 sruby 334: <a href="spec.html#contents">Table of contents</a> –
1.1 mike 335: <a href="the-keygen-element.html">4.10.14 The keygen element →</a>
1.159 sruby 336: </div>
1.1 mike 337:
1.85 mike 338: <h4 id="the-textarea-element"><span class="secno">4.10.13 </span>The <dfn><code>textarea</code></dfn> element</h4>
339:
340: <dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.159 sruby 341: <dd><a href="content-models.html#flow-content-1">Flow content</a>.</dd>
342: <dd><a href="content-models.html#phrasing-content-1">Phrasing content</a>.</dd>
343: <dd><a href="content-models.html#interactive-content-0">Interactive content</a>.</dd>
1.1 mike 344: <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>
1.159 sruby 345: <dd><a href="content-models.html#palpable-content-0">Palpable content</a>.</dd>
1.25 mike 346: <dt><a href="element-definitions.html#element-dfn-contexts" title="element-dfn-contexts">Contexts in which this element can be used</a>:</dt>
1.159 sruby 347: <dd>Where <a href="content-models.html#phrasing-content-1">phrasing content</a> is expected.</dd>
1.25 mike 348: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 349: <dd><a href="content-models.html#text-content" title="text content">Text</a>.</dd>
1.25 mike 350: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 351: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
352: <dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
353: <dd><code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code></dd>
354: <dd><code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code></dd>
355: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
356: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
357: <dd><code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code></dd>
358: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
359: <dd><code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code></dd>
360: <dd><code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code></dd>
361: <dd><code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code></dd>
362: <dd><code title="attr-textarea-rows"><a href="#attr-textarea-rows">rows</a></code></dd>
363: <dd><code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code></dd>
1.159 sruby 364: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt><!--TOPIC:DOM APIs-->
1.1 mike 365: <dd>
366: <pre class="idl">interface <dfn id="htmltextareaelement">HTMLTextAreaElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
367: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
368: attribute unsigned long <a href="#dom-textarea-cols" title="dom-textarea-cols">cols</a>;
369: attribute DOMString <a href="#dom-textarea-dirname" title="dom-textarea-dirName">dirName</a>;
370: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
371: 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>;
372: attribute long <a href="#dom-textarea-maxlength" title="dom-textarea-maxLength">maxLength</a>;
373: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
374: attribute DOMString <a href="#dom-textarea-placeholder" title="dom-textarea-placeholder">placeholder</a>;
375: attribute boolean <a href="#dom-textarea-readonly" title="dom-textarea-readOnly">readOnly</a>;
376: attribute boolean <a href="#dom-textarea-required" title="dom-textarea-required">required</a>;
377: attribute unsigned long <a href="#dom-textarea-rows" title="dom-textarea-rows">rows</a>;
378: attribute DOMString <a href="#dom-textarea-wrap" title="dom-textarea-wrap">wrap</a>;
379:
380: readonly attribute DOMString <a href="#dom-textarea-type" title="dom-textarea-type">type</a>;
381: attribute DOMString <a href="#dom-textarea-defaultvalue" title="dom-textarea-defaultValue">defaultValue</a>;
382: attribute DOMString <a href="#dom-textarea-value" title="dom-textarea-value">value</a>;
383: readonly attribute unsigned long <a href="#dom-textarea-textlength" title="dom-textarea-textLength">textLength</a>;
384:
385: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
386: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
387: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
388: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
389: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
390:
391: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
392:
1.159 sruby 393: void <a href="textFieldSelection.html#dom-textarea/input-select" title="dom-textarea/input-select">select</a>();
394: attribute unsigned long <a href="textFieldSelection.html#dom-textarea/input-selectionstart" title="dom-textarea/input-selectionStart">selectionStart</a>;
395: attribute unsigned long <a href="textFieldSelection.html#dom-textarea/input-selectionend" title="dom-textarea/input-selectionEnd">selectionEnd</a>;
396: attribute DOMString <a href="textFieldSelection.html#dom-textarea/input-selectiondirection" title="dom-textarea/input-selectionDirection">selectionDirection</a>;
397:
398: 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);
1.1 mike 399: };</pre>
400: </dd>
1.159 sruby 401: </dl><!--TOPIC:HTML--><p>The <code><a href="#the-textarea-element">textarea</a></code> element <a href="rendering.html#represents">represents</a> a
1.1 mike 402: multiline plain text edit control<span class="impl"> for the
403: element's <dfn id="concept-textarea-raw-value" title="concept-textarea-raw-value">raw
404: value</dfn></span>. The contents of the control represent the
1.85 mike 405: control's default value.</p>
406:
407: <div class="impl">
1.1 mike 408:
409: <p>The <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> of
410: a <code><a href="#the-textarea-element">textarea</a></code> control must be initially the empty
411: string.</p>
412:
413: <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
414: paragraphs for the purposes of the Unicode bidirectional algorithm.
415: This requirement may be implemented indirectly through the style
416: layer. For example, an HTML+CSS user agent could implement these
417: requirements by implementing the CSS 'unicode-bidi' property. <a href="references.html#refsBIDI">[BIDI]</a> <a href="references.html#refsCSS">[CSS]</a></p>
418:
1.85 mike 419: </div>
420:
421: <p>The <dfn id="attr-textarea-readonly" title="attr-textarea-readonly"><code>readonly</code></dfn> attribute
1.1 mike 422: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a> used to control whether the text
1.85 mike 423: can be edited by the user or not.</p>
424:
425: <div class="impl">
1.1 mike 426:
427: <p><strong>Constraint validation</strong>: If the <code title="attr-textarea-readonly"><a href="#attr-textarea-readonly">readonly</a></code> attribute is
428: specified on a <code><a href="#the-textarea-element">textarea</a></code> element, the element is
429: <a href="constraints.html#barred-from-constraint-validation">barred from constraint validation</a>.</p>
430:
431: <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
432: <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
433: specified.</p>
434:
435: <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
436: editable by the user: the user agent should allow the user to edit,
437: insert, and remove text, and to insert and remove line breaks in the
1.85 mike 438: form of "LF" (U+000A) characters. Any time the user causes
1.1 mike 439: the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
440: value</a> to change, the user agent must <a href="webappapis.html#queue-a-task">queue a
441: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
442: <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
443: element. User agents may wait for a suitable break in the user's
444: interaction before queuing the task; for example, a user agent could
445: wait for the user to have not hit a key for 100ms, so as to only
446: fire the event when the user pauses, instead of continuously for
1.159 sruby 447: each keystroke.</p> <!-- same text is present in the <input> section
448: -->
1.4 mike 449:
1.1 mike 450: <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
451: initially set to false, and must be set to true whenever the user
452: 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>
453:
454: <p>When the <code><a href="#the-textarea-element">textarea</a></code> element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
455: IDL attribute changes value, if the element's <a href="#concept-textarea-dirty" title="concept-textarea-dirty">dirty value flag</a> is false,
456: then the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
457: value</a> must be set to the value of the element's
458: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute.</p>
459:
1.159 sruby 460: <p>The <a href="constraints.html#concept-form-reset-control" title="concept-form-reset-control">reset
1.1 mike 461: algorithm</a> for <code><a href="#the-textarea-element">textarea</a></code> elements is to set the
462: element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">value</a> to
463: the value of the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL
464: attribute.</p>
465:
1.159 sruby 466: <!-- this next bit is also in the <input> Text/Search section -->
467: <!-- and something similar is in the session history section -->
1.1 mike 468: <p>If the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, the user agent
469: should allow the user to change the writing direction of the
470: element, setting it either to a left-to-right writing direction or a
471: right-to-left writing direction. If the user does so, the user agent
472: must then run the following steps:</p>
473:
474: <ol><li><p>Set the element's <code title="attr-dir"><a href="global-attributes.html#the-dir-attribute">dir</a></code>
475: attribute to "<code title="attr-dir-ltr"><a href="global-attributes.html#attr-dir-ltr">ltr</a></code>" if the user
476: 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
477: right-to-left writing direction.</p></li>
478:
479: <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
480: event</a> that bubbles named <code title="event-input">input</code> at the <code><a href="#the-textarea-element">textarea</a></code>
481: element.</p></li>
482:
1.85 mike 483: </ol></div>
484:
485: <p>The <dfn id="attr-textarea-cols" title="attr-textarea-cols"><code>cols</code></dfn>
1.1 mike 486: attribute specifies the expected maximum number of characters per
487: line. If the <code title="attr-textarea-cols"><a href="#attr-textarea-cols">cols</a></code> attribute
488: is specified, its value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative
489: integer</a> greater than zero. <span class="impl">If applying the
490: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the
491: attribute's value results in a number greater than zero, then the
492: element's <dfn id="attr-textarea-cols-value" title="attr-textarea-cols-value">character
1.85 mike 493: width</dfn> is that value; otherwise, it is 20.</span></p>
494:
495: <div class="impl">
1.1 mike 496:
497: <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
498: the user as to how many characters the server prefers per line
499: (e.g. for visual user agents by making the width of the control be
500: that many characters). In visual renderings, the user agent should
501: wrap the user's input in the rendering so that each line is no wider
502: than this number of characters.</p>
503:
1.85 mike 504: </div>
505:
506: <p>The <dfn id="attr-textarea-rows" title="attr-textarea-rows"><code>rows</code></dfn>
1.1 mike 507: 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
508: value must be a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a> greater than
509: zero. <span class="impl">If applying the <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing
510: non-negative integers</a> to the attribute's value results in a
511: 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 512: value; otherwise, it is 2.</span></p>
513:
514: <div class="impl">
1.1 mike 515:
516: <p>Visual user agents should set the height of the control to the
517: number of lines given by <a href="#attr-textarea-rows-value" title="attr-textarea-rows-value">character height</a>.</p>
518:
1.85 mike 519: </div>
520:
521: <p>The <dfn id="attr-textarea-wrap" title="attr-textarea-wrap"><code>wrap</code></dfn>
1.1 mike 522: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a> with two keywords
523: and states: the <dfn id="attr-textarea-wrap-soft" title="attr-textarea-wrap-soft"><code>soft</code></dfn> keyword
524: which maps to the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state, and the
525: <dfn id="attr-textarea-wrap-hard" title="attr-textarea-wrap-hard"><code>hard</code></dfn> keyword
526: which maps to the <a href="#attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</a> state. The
1.85 mike 527: <i>missing value default</i> is the <a href="#attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</a> state.</p>
528:
529: <p>The <dfn id="attr-textarea-wrap-soft-state" title="attr-textarea-wrap-soft-state">Soft</dfn> state
1.1 mike 530: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is not to be
531: wrapped when it is submitted (though it can still be wrapped in the
1.85 mike 532: rendering).</p>
533:
534: <p>The <dfn id="attr-textarea-wrap-hard-state" title="attr-textarea-wrap-hard-state">Hard</dfn> state
1.1 mike 535: indicates that the text in the <code><a href="#the-textarea-element">textarea</a></code> is to have
536: newlines added by the user agent so that the text is wrapped when it
1.85 mike 537: is submitted.</p>
538:
539: <p>If the element's <code title="attr-textarea-wrap"><a href="#attr-textarea-wrap">wrap</a></code>
1.1 mike 540: 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 541: specified.</p>
542:
1.159 sruby 543: <!-- attr-textarea-wrap-off (attr-textarea-wrap-off-state): not
544: conforming; turns off the rendering of wrapping but otherwise acts
545: like 'soft' -->
1.85 mike 546:
547: <div class="impl">
1.1 mike 548:
549: <p>For historical reasons, the element's value is normalised in
550: 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
551: 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
552: used in the <code title="dom-textarea-value"><a href="#dom-textarea-value">value</a></code> IDL
1.85 mike 553: 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 554: breaks use U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character
555: 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
556: breaks are inserted to wrap the text at the given width.</p>
557:
558: <p>The element's <dfn id="concept-textarea-api-value" title="concept-textarea-api-value">API
559: 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
560: following transformation applied:</p>
561:
562: <ol><li><p>Replace every U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
563: character pair from the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with a single
564: U+000A LINE FEED (CRLF) character.</p></li>
565:
566: <li><p>Replace every remaining U+000D CARRIAGE RETURN character from
567: the <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with
568: a single U+000A LINE FEED (CRLF) character.</p></li>
569:
570: </ol><p>The element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
571: defined to be the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw value</a> with the
572: following transformation applied:</p>
573:
1.85 mike 574: <ol><li><p>Replace every occurrence of a "CR" (U+000D)
575: character not followed by a "LF" (U+000A) character, and
576: every occurrence of a "LF" (U+000A) character not preceded
577: by a "CR" (U+000D) character, by a two-character
1.1 mike 578: string consisting of a U+000D CARRIAGE RETURN U+000A LINE FEED
579: (CRLF) character pair.</p></li>
580:
581: <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
582: U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pairs
583: into the string using a UA-defined algorithm so that each line has
584: no more than <a href="#attr-textarea-cols-value" title="attr-textarea-cols-value">character
585: width</a> characters. For the purposes of this requirement,
586: lines are delimited by the start of the string, the end of the
587: string, and U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF)
588: character pairs.</p></li>
589:
1.85 mike 590: </ol></div>
591:
592: <p>The <dfn id="attr-textarea-maxlength" title="attr-textarea-maxlength"><code>maxlength</code></dfn>
1.1 mike 593: 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 594: <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>
595:
596: <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 597: value length</a>, then the element's children must be such that
1.125 mike 598: the <a href="infrastructure.html#code-unit-length">code-unit length</a> of the value of the element's
1.1 mike 599: <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute is equal to or less than the
1.85 mike 600: element's <a href="attributes-common-to-form-controls.html#maximum-allowed-value-length">maximum allowed value length</a>.</p>
601:
602: <p>The <dfn id="attr-textarea-required" title="attr-textarea-required"><code>required</code></dfn> attribute
1.1 mike 603: is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the user will
1.85 mike 604: be required to enter a value before submitting the form.</p>
605:
606: <div class="impl">
1.1 mike 607:
608: <p><strong>Constraint validation</strong>: If the element has its
609: <code title="attr-textarea-required"><a href="#attr-textarea-required">required</a></code> attribute
610: specified, and the element is <a href="#concept-textarea-mutable" title="concept-textarea-mutable">mutable</a>, and the element's
611: <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is the empty string,
612: then the element is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
613:
1.85 mike 614: </div>
615:
616:
1.159 sruby 617: <!-- similar text in the <input> section -->
1.85 mike 618:
619: <p>The <dfn id="attr-textarea-placeholder" title="attr-textarea-placeholder"><code>placeholder</code></dfn>
1.1 mike 620: attribute represents a hint (a word or short phrase) intended to aid
621: the user with data entry. A hint could be a sample value or a brief
622: description of the expected format. The attribute, if specified,
1.85 mike 623: must have a value that contains no "LF" (U+000A) or "CR" (U+000D) characters.</p>
624:
625: <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>
626:
627: <p>The <code title="attr-textarea-placeholder"><a href="#attr-textarea-placeholder">placeholder</a></code>
1.1 mike 628: attribute should not be used as an alternative to a
1.85 mike 629: <code><a href="the-label-element.html#the-label-element">label</a></code>.</p>
630:
631: <div class="impl">
1.1 mike 632:
633: <p>User agents should present this hint to the user, after having
634: <a href="common-microsyntaxes.html#strip-line-breaks" title="strip line breaks">stripped line breaks</a> from it,
635: when the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is
636: the empty string and the control is not focused (e.g. by displaying
637: it inside a blank unfocused control).</p>
638:
1.85 mike 639: </div>
640:
641: <p>The <dfn id="attr-textarea-dirname" title="attr-textarea-dirname"><code>dirname</code></dfn>
1.159 sruby 642: attribute is a <a href="form-submission.html#form-control-dirname-attribute">form control <code title="">dirname</code>
1.85 mike 643: attribute</a>.</p>
644:
645: <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 646: explicitly associate the <code><a href="#the-textarea-element">textarea</a></code> element with its
647: <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>
648: 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
649: the control non-interactive and to prevent its value from being
650: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
1.85 mike 651: attribute controls focus.</p>
652:
1.159 sruby 653: <!--TOPIC:DOM APIs-->
1.85 mike 654: <dl class="domintro"><dt><var title="">textarea</var> . <code title="attr-textarea-type">type</code></dt>
1.1 mike 655:
656: <dd>
657:
658: <p>Returns the string "<code title="">textarea</code>".</p>
659:
660: </dd>
661:
662: <dt><var title="">textarea</var> . <code title="attr-textarea-value">value</code></dt>
663:
664: <dd>
665:
666: <p>Returns the current value of the element.</p>
667:
668: <p>Can be set, to change the value.</p>
669:
670: </dd>
671:
672: </dl><div class="impl">
673:
674: <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>,
675: <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
676: <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the same
677: 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
678: 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
679: 20. The <code title="dom-textarea-rows"><a href="#dom-textarea-rows">rows</a></code> attribute's
680: default value is 2. The <dfn id="dom-textarea-dirname" title="dom-textarea-dirName"><code>dirName</code></dfn> IDL
681: 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
682: <dfn id="dom-textarea-maxlength" title="dom-textarea-maxLength"><code>maxLength</code></dfn> IDL
683: 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,
684: <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
685: 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
686: attribute.</p>
687:
688: <p>The <dfn id="dom-textarea-type" title="dom-textarea-type"><code>type</code></dfn> IDL
689: attribute must return the value "<code title="">textarea</code>".</p>
690:
691: <p>The <dfn id="dom-textarea-defaultvalue" title="dom-textarea-defaultValue"><code>defaultValue</code></dfn>
692: IDL attribute must act like the element's <code><a href="infrastructure.html#textcontent">textContent</a></code>
693: IDL attribute.</p>
694:
695: <p>The <dfn id="dom-textarea-value" title="dom-textarea-value"><code>value</code></dfn>
696: 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
697: must set the element's <a href="#concept-textarea-raw-value" title="concept-textarea-raw-value">raw
698: 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
699: should then move the text entry cursor position to the end of the
700: text field, unselecting any selected text and resetting the
701: selection direction to <i>none</i>.</p>
702:
703: <p>The <dfn id="dom-textarea-textlength" title="dom-textarea-textLength"><code>textLength</code></dfn> IDL
1.125 mike 704: attribute must return the <a href="infrastructure.html#code-unit-length">code-unit length</a> of the
1.1 mike 705: element's <a href="#concept-textarea-api-value" title="concept-textarea-api-value">API
706: value</a>.</p>
707:
708: <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>
709: 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>
710: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
711: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
1.159 sruby 712: 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>,
713: <code title="dom-textarea/input-selectionEnd"><a href="textFieldSelection.html#dom-textarea/input-selectionend">selectionEnd</a></code>,
714: <code title="dom-textarea/input-selectionDirection"><a href="textFieldSelection.html#dom-textarea/input-selectiondirection">selectionDirection</a></code>,
715:
716: and <code title="dom-textarea/input-setSelectionRange"><a href="textFieldSelection.html#dom-textarea/input-setselectionrange">setSelectionRange()</a></code>
1.1 mike 717: methods and attributes expose the element's text selection. The
718: <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
719: element's forms API.</p>
720:
1.85 mike 721: </div>
1.159 sruby 722: <!--TOPIC:HTML-->
1.85 mike 723:
724: <div class="example">
1.1 mike 725:
726: <p>Here is an example of a <code><a href="#the-textarea-element">textarea</a></code> being used for
727: unrestricted free-form text input in a form:</p>
728:
729: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments></textarea></p></pre>
730:
731: <p>To specify a maximum length for the comments, one can use
732: the <code title="attr-textarea-maxlength"><a href="#attr-textarea-maxlength">maxlength</a></code>
733: attribute:</p>
734:
735: <pre><p>If you have any short comments, please let us know: <textarea cols=80 name=comments maxlength=200></textarea></p></pre>
736:
737: <p>To give a default value, text can be included inside the element:</p>
738:
739: <pre><p>If you have any comments, please let us know: <textarea cols=80 name=comments>You rock!</textarea></p></pre>
740:
741: <p>To have the browser submit <a href="global-attributes.html#the-directionality">the directionality</a> of
742: the element along with the value, the <code title="attr-textarea-dirname"><a href="#attr-textarea-dirname">dirname</a></code> attribute can be
743: specified:</p>
744:
745: <pre><p>If you have any comments, please let us know (you may use either English or Hebrew for your comments):
746: <textarea cols=80 name=comments dirname=comments.dir></textarea></p></pre>
747:
1.85 mike 748: </div>
749:
750:
751:
752: </body></html>
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