Annotation of html5/spec/common-input-element-apis.html, revision 1.195
1.88 mike 1: <!DOCTYPE html>
1.159 sruby 2: <html lang="en-US-x-Hixie"><head><title>4.10.7.4 Common input element APIs — HTML5</title><style type="text/css">
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34:
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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; }
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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; }
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76: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
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78: div.head h1 { margin: 0; }
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90: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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168:
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181: }
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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; }
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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; }
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209:
210: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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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; }
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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; }
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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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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 {
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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: }
1.195 ! sruby 322: </script><link href="common-input-element-attributes.html" title="4.10.7.3 Common input element attributes" rel="prev">
! 323: <link href="spec.html#contents" title="Table of contents" rel="contents">
1.1 mike 324: <link href="the-button-element.html" title="4.10.8 The button 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>
1.195 ! 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>
1.193 sruby 330: <h2 class="no-num no-toc" id="editor's-draft-date-1-january-1970">Editor's Draft 10 October 2012</h2>
1.85 mike 331: </div>
1.195 ! sruby 332: <div class="prev_next">
1.33 mike 333: <a href="common-input-element-attributes.html">← 4.10.7.3 Common input element attributes</a> –
1.195 ! sruby 334: <a href="spec.html#contents">Table of contents</a> –
1.1 mike 335: <a href="the-button-element.html">4.10.8 The button element →</a>
1.195 ! sruby 336: <ol class="toc"><li><ol><li><ol><li><ol><li><a href="common-input-element-apis.html#common-input-element-apis"><span class="secno">4.10.7.4 </span>Common <code>input</code> element APIs</a></li><li><a href="common-input-element-apis.html#common-event-behaviors"><span class="secno">4.10.7.5 </span>Common event behaviors</a></li></ol></li></ol></li></ol></li></ol></div>
1.1 mike 337:
1.85 mike 338: <h5 id="common-input-element-apis"><span class="secno">4.10.7.4 </span>Common <code><a href="the-input-element.html#the-input-element">input</a></code> element APIs</h5>
339:
340: <dl class="domintro"><dt><var title="">input</var> . <code title="dom-input-value"><a href="#dom-input-value">value</a></code> [ = <var title="">value</var> ]</dt>
1.1 mike 341:
342: <dd>
343:
344: <p>Returns the current <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>
345: of the form control.</p>
346:
347: <p>Can be set, to change the value.</p>
348:
349: <p>Throws an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception if it is
350: set to any value other than the empty string when the control is a
351: file upload control.</p>
352:
353: </dd>
354:
355: <dt><var title="">input</var> . <code title="dom-input-checked"><a href="#dom-input-checked">checked</a></code> [ = <var title="">value</var> ]</dt>
356:
357: <dd>
358:
359: <p>Returns the current <a href="attributes-common-to-form-controls.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> of the form
360: control.</p>
361:
362: <p>Can be set, to change the <a href="attributes-common-to-form-controls.html#concept-fe-checked" title="concept-fe-checked">checkedness</a>.</p>
363:
364: </dd>
365:
366: <dt><var title="">input</var> . <code title="dom-input-files"><a href="#dom-input-files">files</a></code></dt>
367:
368: <dd>
369:
1.8 mike 370: <p>Returns a <code><a href="infrastructure.html#filelist">FileList</a></code> object listing the <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a> of
1.1 mike 371: the form control.</p>
372:
373: <p>Returns null if the control isn't a file control.</p>
374:
375: </dd>
376:
377: <dt><var title="">input</var> . <code title="dom-input-valueAsDate"><a href="#dom-input-valueasdate">valueAsDate</a></code> [ = <var title="">value</var> ]</dt>
378:
379: <dd>
380:
381: <p>Returns a <code>Date</code> object representing the form
382: control's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>, if
383: applicable; otherwise, returns null.</p>
384:
385: <p>Can be set, to change the value.</p>
386:
387: <p>Throws an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception if the
388: control isn't date- or time-based.</p>
389:
390: </dd>
391:
392: <dt><var title="">input</var> . <code title="dom-input-valueAsNumber"><a href="#dom-input-valueasnumber">valueAsNumber</a></code> [ = <var title="">value</var> ]</dt>
393:
394: <dd>
395:
396: <p>Returns a number representing the form control's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>, if applicable; otherwise,
1.47 mike 397: returns NaN.</p>
1.1 mike 398:
399: <p>Can be set, to change the value.</p>
400:
401: <p>Throws an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception if the
402: control is neither date- or time-based nor numeric.</p>
403:
404: </dd>
405:
406: <dt><var title="">input</var> . <code title="dom-input-stepUp"><a href="#dom-input-stepup">stepUp</a></code>( [ <var title="">n</var> ] )</dt>
407: <dt><var title="">input</var> . <code title="dom-input-stepDown"><a href="#dom-input-stepdown">stepDown</a></code>( [ <var title="">n</var> ] )</dt>
408:
409: <dd>
410:
411: <p>Changes the form control's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> by the value given in the
412: <code title="attr-input-step"><a href="common-input-element-attributes.html#attr-input-step">step</a></code> attribute, multiplied by
413: <var title="">n</var>. The default value for <var title="">n</var>
414: is 1.</p>
415:
416: <p>Throws <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception if the control
417: is neither date- or time-based nor numeric, if the <code title="attr-input-step"><a href="common-input-element-attributes.html#attr-input-step">step</a></code> attribute's value is "<code title="">any</code>", if the current <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> could not be parsed, or if
418: stepping in the given direction by the given amount would take the
419: value out of range.</p>
420:
421: </dd>
422:
423: <dt><var title="">input</var> . <code title="dom-input-list"><a href="#dom-input-list">list</a></code></dt>
424:
425: <dd>
426:
427: <p>Returns the <code><a href="the-datalist-element.html#the-datalist-element">datalist</a></code> element indicated by the
428: <code title="attr-input-list"><a href="common-input-element-attributes.html#attr-input-list">list</a></code> attribute.</p>
429:
430: </dd>
431:
432: </dl><div class="impl">
433:
434: <p>The <dfn id="dom-input-value" title="dom-input-value"><code>value</code></dfn> IDL
435: attribute allows scripts to manipulate the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of an <code><a href="the-input-element.html#the-input-element">input</a></code>
436: element. The attribute is in one of the following modes, which
437: define its behavior:</p>
438:
439: <dl><dt><dfn id="dom-input-value-value" title="dom-input-value-value">value</dfn>
440:
441: </dt><dd>
442:
443: <p>On getting, it must return the current <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the element. On setting,
444: it must set the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> to the new value, set the
445: element's <a href="the-input-element.html#concept-input-value-dirty-flag" title="concept-input-value-dirty-flag">dirty value
446: flag</a> to true, invoke the <a href="the-input-element.html#value-sanitization-algorithm">value sanitization
447: algorithm</a>, if the element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state
448: defines one, and then, if the element has a text entry cursor
449: position, should move the text entry cursor position to the end of
450: the text field, unselecting any selected text and resetting the
451: selection direction to <i>none</i>.</p>
452:
453: </dd>
454:
455: <dt><dfn id="dom-input-value-default" title="dom-input-value-default">default</dfn>
456:
457: </dt><dd>
458:
459: <p>On getting, if the element has a <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute, it must return
460: that attribute's value; otherwise, it must return the empty
461: string. On setting, it must set the element's <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute to the new
462: value.</p>
463:
464: </dd>
465:
466: <dt><dfn id="dom-input-value-default-on" title="dom-input-value-default-on">default/on</dfn>
467:
468: </dt><dd>
469:
470: <p>On getting, if the element has a <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute, it must return
471: that attribute's value; otherwise, it must return the string
472: "<code title="">on</code>". On setting, it must set the element's
473: <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute to the new
474: value.</p>
475:
476: </dd>
477:
478: <dt><dfn id="dom-input-value-filename" title="dom-input-value-filename">filename</dfn>
479:
480: </dt><dd id="fakepath-orly">
481:
482: <p>On getting, it must return the string "<code title="">C:\fakepath\</code>" followed by the filename of the
1.8 mike 483: first file in the list of <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>, if
1.1 mike 484: any, or the empty string if the list is empty. On setting, if the
1.8 mike 485: new value is the empty string, it must empty the list of <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>;
1.1 mike 486: otherwise, it must throw an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code>
487: exception.</p>
488:
489: <p class="note">This "fakepath" requirement is a sad accident of
1.8 mike 490: history. See <a href="states-of-the-type-attribute.html#fakepath-srsly">the example in the File
1.1 mike 491: Upload state section</a> for more information.</p>
492:
493: </dd>
494:
495: </dl><hr><p>The <dfn id="dom-input-checked" title="dom-input-checked"><code>checked</code></dfn> IDL
496: attribute allows scripts to manipulate the <a href="attributes-common-to-form-controls.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> of an
497: <code><a href="the-input-element.html#the-input-element">input</a></code> element. On getting, it must return the current
498: <a href="attributes-common-to-form-controls.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> of the element;
499: and on setting, it must set the element's <a href="attributes-common-to-form-controls.html#concept-fe-checked" title="concept-fe-checked">checkedness</a> to the new value and
500: set the element's <a href="the-input-element.html#concept-input-checked-dirty-flag" title="concept-input-checked-dirty-flag">dirty checkedness
501: flag</a> to true.</p>
502:
503: <hr><p>The <dfn id="dom-input-files" title="dom-input-files"><code>files</code></dfn> IDL
1.8 mike 504: attribute allows scripts to access the element's <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>. On
1.1 mike 505: getting, if the IDL attribute applies, it must return a
1.8 mike 506: <code><a href="infrastructure.html#filelist">FileList</a></code> object that represents the current <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>. The
507: same object must be returned until the list of <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>
1.1 mike 508: changes. If the IDL attribute does not apply, then it must instead
1.190 sruby 509: return null. <a href="textFieldSelection.html#refsFILEAPI">[FILEAPI]</a></p>
1.1 mike 510:
511: <hr><p>The <dfn id="dom-input-valueasdate" title="dom-input-valueAsDate"><code>valueAsDate</code></dfn> IDL
512: attribute represents the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the element, interpreted
513: as a date.</p>
514:
515: <p>On getting, if the <code title="dom-input-valueAsDate"><a href="#dom-input-valueasdate">valueAsDate</a></code> attribute does not
516: apply, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code> element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state, then
517: return null. Otherwise, run the <a href="the-input-element.html#concept-input-value-string-date" title="concept-input-value-string-date">algorithm to convert a
518: string to a <code>Date</code> object</a> defined for that state;
519: if the algorithm returned a <code>Date</code> object, then return
520: it, otherwise, return null.</p>
521:
522: <p>On setting, if the <code title="dom-input-valueAsDate"><a href="#dom-input-valueasdate">valueAsDate</a></code> attribute does not
523: apply, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code> element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state, then
1.34 mike 524: throw an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception; otherwise, if the
525: new value is null or a <code>Date</code> object representing the NaN
526: time value, then set the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>
527: of the element to the empty string; otherwise, run the <a href="the-input-element.html#concept-input-value-date-string" title="concept-input-value-date-string">algorithm to convert a
1.1 mike 528: <code>Date</code> object to a string</a>, as defined for that
529: state, on the new value, and set the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the element to resulting
530: string.</p>
531:
532: <hr><p>The <dfn id="dom-input-valueasnumber" title="dom-input-valueAsNumber"><code>valueAsNumber</code></dfn> IDL
533: attribute represents the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>
534: of the element, interpreted as a number.</p>
535:
536: <p>On getting, if the <code title="dom-input-valueAsNumber"><a href="#dom-input-valueasnumber">valueAsNumber</a></code> attribute does
537: not apply, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code> element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state, then
538: return a Not-a-Number (NaN) value. Otherwise, if the <code title="dom-input-valueAsDate"><a href="#dom-input-valueasdate">valueAs<em>Date</em></a></code>
539: attribute applies, run the <a href="the-input-element.html#concept-input-value-string-date" title="concept-input-value-string-date">algorithm to convert a
540: string to a <code>Date</code> object</a> defined for that state;
541: if the algorithm returned a <code>Date</code> object, then return
542: the <i>time value</i> of the object (the number of milliseconds from
543: midnight UTC the morning of 1970-01-01 to the time represented by
544: the <code>Date</code> object), otherwise, return a Not-a-Number
545: (NaN) value. Otherwise, run the <a href="the-input-element.html#concept-input-value-string-number" title="concept-input-value-string-number">algorithm to convert a
546: string to a number</a> defined for that state; if the algorithm
547: returned a number, then return it, otherwise, return a Not-a-Number
548: (NaN) value.</p>
549:
550: <p>On setting, if the <code title="dom-input-valueAsNumber"><a href="#dom-input-valueasnumber">valueAsNumber</a></code> attribute does
551: not apply, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code> element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state, then
552: throw an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception. Otherwise, if
553: the <code title="dom-input-valueAsDate"><a href="#dom-input-valueasdate">valueAs<em>Date</em></a></code>
554: attribute applies, run the <a href="the-input-element.html#concept-input-value-date-string" title="concept-input-value-date-string">algorithm to convert a
555: <code>Date</code> object to a string</a> defined for that state,
556: passing it a <code>Date</code> object whose <i>time value</i> is the
557: new value, and set the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a>
558: of the element to resulting string. Otherwise, run the <a href="the-input-element.html#concept-input-value-number-string" title="concept-input-value-number-string">algorithm to convert a
559: number to a string</a>, as defined for that state, on the new
560: value, and set the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of
561: the element to resulting string.</p>
562:
563: <hr><p>The <dfn id="dom-input-stepdown" title="dom-input-stepDown"><code>stepDown(<var title="">n</var>)</code></dfn> and <dfn id="dom-input-stepup" title="dom-input-stepUp"><code>stepUp(<var title="">n</var>)</code></dfn> methods, when invoked, must run the
564: following algorithm:</p>
565:
566: <ol><li><p>If the <code title="dom-input-stepDown"><a href="#dom-input-stepdown">stepDown()</a></code> and
567: <code title="dom-input-stepUp"><a href="#dom-input-stepup">stepUp()</a></code> methods do not
568: apply, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code> element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's current state, then
569: throw an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception, and abort these
570: steps.</p></li>
571:
572: <li><p>If the element has no <a href="common-input-element-attributes.html#concept-input-step" title="concept-input-step">allowed value step</a>, then throw an
573: <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception, and abort these
574: steps.</p></li>
575:
576: <li><p>If applying the <a href="the-input-element.html#concept-input-value-string-number" title="concept-input-value-string-number">algorithm to convert a
577: string to a number</a> to the string given by the element's
578: <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> results in an error,
579: then throw an <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception, and abort
580: these steps; otherwise, let <var title="">value</var> be the result
581: of that algorithm.</p></li>
582:
583: <li><p>Let <var title="">n</var> be the argument, or 1 if the
584: argument was omitted.</p></li>
585:
586: <li><p>Let <var title="">delta</var> be the <a href="common-input-element-attributes.html#concept-input-step" title="concept-input-step">allowed value step</a> multiplied by
587: <var title="">n</var>.</p></li>
588:
589: <li><p>If the method invoked was the <code title="dom-input-stepDown"><a href="#dom-input-stepdown">stepDown()</a></code> method, negate <var title="">delta</var>.</p></li>
590:
591: <li><p>Let <var title="">value</var> be the result of adding <var title="">delta</var> to <var title="">value</var>.</p></li>
592: <li><p>If the element has a <a href="common-input-element-attributes.html#concept-input-min" title="concept-input-min">minimum</a>, and the <var title="">value</var> is less than that <a href="common-input-element-attributes.html#concept-input-min" title="concept-input-min">minimum</a>, then throw a
593: <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception.</p></li>
594:
595: <li><p>If the element has a <a href="common-input-element-attributes.html#concept-input-max" title="concept-input-max">maximum</a>, and the <var title="">value</var> is greater than that <a href="common-input-element-attributes.html#concept-input-max" title="concept-input-max">maximum</a>, then throw a
596: <code><a href="infrastructure.html#invalidstateerror">InvalidStateError</a></code> exception.</p></li>
597:
598: <li><p>Let <var title="">value as string</var> be the result of
599: running the <a href="the-input-element.html#concept-input-value-number-string" title="concept-input-value-number-string">algorithm to convert a
600: number to a string</a>, as defined for the <code><a href="the-input-element.html#the-input-element">input</a></code>
601: element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute's
602: current state, on <var title="">value</var>.</p></li>
603:
604: <li><p>Set the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the
605: element to <var title="">value as string</var>.</p></li>
606:
607: </ol><hr><p>The <dfn id="dom-input-list" title="dom-input-list"><code>list</code></dfn> IDL
608: attribute must return the current <a href="common-input-element-attributes.html#concept-input-list" title="concept-input-list">suggestions source element</a>, if
609: any, or null otherwise.</p>
610:
1.85 mike 611: </div>
1.159 sruby 612: <!--TOPIC:HTML-->
1.85 mike 613:
614:
615: <div class="impl">
1.1 mike 616:
1.33 mike 617: <h5 id="common-event-behaviors"><span class="secno">4.10.7.5 </span>Common event behaviors</h5>
1.1 mike 618:
619: <p>When the <dfn id="event-input-input" title="event-input-input"><code>input</code></dfn>
620: event applies, any time the user causes the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> to change, the user agent must
1.190 sruby 621: <a href="textFieldSelection.html#queue-a-task">queue a task</a> to <a href="textFieldSelection.html#fire-a-simple-event">fire a simple event</a> that
1.1 mike 622: bubbles named <code title="event-input">input</code> at the
623: <code><a href="the-input-element.html#the-input-element">input</a></code> element. User agents may wait for a suitable
624: break in the user's interaction before queuing the task; for
625: example, a user agent could wait for the user to have not hit a key
626: for 100ms, so as to only fire the event when the user pauses,
1.159 sruby 627: instead of continuously for each keystroke.</p> <!-- same text is
628: present in the <textarea> section -->
1.4 mike 629:
1.1 mike 630: <p class="example">Examples of a user changing the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> would include the user typing
631: into a text field, pasting a new value into the field, or undoing an
632: edit in that field. Some user interactions do not cause changes to
633: the value, e.g. hitting the "delete" key in an empty text field, or
634: replacing some text in the field with text from the clipboard that
635: happens to be exactly the same text.</p>
636:
637: <p>When the <dfn id="event-input-change" title="event-input-change"><code>change</code></dfn> event applies,
638: if the element does not have an <a href="content-models.html#activation-behavior">activation behavior</a>
639: defined but uses a user interface that involves an explicit commit
640: action, then any time the user commits a change to the element's
1.8 mike 641: <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> or list of <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">selected files</a>, the
1.190 sruby 642: user agent must <a href="textFieldSelection.html#queue-a-task">queue a task</a> to <a href="textFieldSelection.html#fire-a-simple-event">fire a simple
1.1 mike 643: event</a> that bubbles named <code title="event-change">change</code> at the <code><a href="the-input-element.html#the-input-element">input</a></code>
644: element.</p>
645:
646: <p class="example">An example of a user interface with a commit
1.159 sruby 647: action would be a <a href="states-of-the-type-attribute.html#file-upload-state-(type=file)" title="attr-input-type-file">File
1.1 mike 648: Upload</a> control that consists of a single button that brings
649: up a file selection dialog: when the dialog is closed, if that the
1.8 mike 650: <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">file selection</a>
651: changed as a result, then the user has committed a new <a href="states-of-the-type-attribute.html#concept-input-type-file-selected" title="concept-input-type-file-selected">file selection</a>.</p>
1.1 mike 652:
653: <p class="example">Another example of a user interface with a commit
1.159 sruby 654: action would be a <a href="states-of-the-type-attribute.html#date-state-(type=date)" title="attr-input-type-date">Date</a>
1.1 mike 655: control that allows both text-based user input and user selection
656: from a drop-down calendar: while text input might not have an
657: explicit commit step, selecting a date from the drop down calendar
658: and then dismissing the drop down would be a commit action.</p>
659:
660: <p>When the user agent changes the element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> on behalf of the user (e.g. as
661: part of a form prefilling feature), the user agent must follow these
662: steps:</p>
663:
664: <ol><li>If the <code title="event-input-input"><a href="#event-input-input">input</a></code> event
1.190 sruby 665: applies, <a href="textFieldSelection.html#queue-a-task">queue a task</a> to <a href="textFieldSelection.html#fire-a-simple-event">fire a simple
1.1 mike 666: event</a> that bubbles named <code title="event-input">input</code> at the <code><a href="the-input-element.html#the-input-element">input</a></code>
667: element.</li>
668:
669: <li>If the <code title="event-input-change"><a href="#event-input-change">change</a></code> event
1.190 sruby 670: applies, <a href="textFieldSelection.html#queue-a-task">queue a task</a> to <a href="textFieldSelection.html#fire-a-simple-event">fire a simple
1.1 mike 671: event</a> that bubbles named <code title="event-change">change</code> at the <code><a href="the-input-element.html#the-input-element">input</a></code>
672: element.</li>
673:
674: </ol><p class="note">In addition, when the <code title="event-input-change"><a href="#event-input-change">change</a></code> event applies, <code title="event-change">change</code> events can also be fired as part
675: of the element's <a href="content-models.html#activation-behavior">activation behavior</a> and as part of the
1.190 sruby 676: <a href="textFieldSelection.html#unfocusing-steps">unfocusing steps</a>.</p>
1.1 mike 677:
1.190 sruby 678: <p>The <a href="textFieldSelection.html#task-source">task source</a> for these <a href="textFieldSelection.html#concept-task" title="concept-task">tasks</a> is the <a href="textFieldSelection.html#user-interaction-task-source">user interaction task
1.1 mike 679: source</a>.</p>
680:
1.85 mike 681: </div>
682:
683:
684:
685: </body></html>
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