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66 lines
No EOL
3 KiB
HTML
66 lines
No EOL
3 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
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<div class="ui-page">
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<div class="ui-header">
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<h1>.prevAll()</h1>
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</div>
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<div class="ui-content ui-body ui-body-c" id="prevAll1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.prevAll( [ selector ] )</span> <span class="returns">Returns: <a class="return" href="http://docs.jquery.com/Types#jQuery">jQuery</a></span>
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</h2>
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<div class=" entry-details">
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<p class="desc"><strong>Description: </strong>Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.</p>
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<ul class="signatures"><li class="signature" id="prevAll-selector">
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<h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.2/">1.2</a></span>.prevAll( [ selector ] )</h4>
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<p class="arguement"><strong>selector</strong>A string containing a selector expression to match elements against.</p>
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</li></ul>
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<div class="longdesc">
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<p>Given a jQuery object that represents a set of DOM elements, the <code>.prevAll()</code> method allows us to search through the predecessors of these elements in the DOM tree and construct a new jQuery object from the matching elements.</p>
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<p>The method optionally accepts a selector expression of the same type that we can pass to the <code>$()</code> function. If the selector is supplied, the elements will be filtered by testing whether they match it.</p>
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<p>Consider a page with a simple list on it:</p>
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<pre>
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<ul>
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<li>list item 1</li>
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<li>list item 2</li>
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<li class="third-item">list item 3</li>
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<li>list item 4</li>
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<li>list item 5</li>
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</ul>
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</pre>
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<p>If we begin at the third item, we can find the elements which come before it:</p>
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<pre>$('li.third-item').prevAll().css('background-color', 'red');</pre>
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<p>The result of this call is a red background behind items 1 and 2. Since we do not supply a selector expression, these preceding elements are unequivocally included as part of the object. If we had supplied one, the elements would be tested for a match before they were included.</p>
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</div>
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<h3>Example:</h3>
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<div id="entry-examples" class="entry-examples"><div id="example-0">
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<h4><span class="desc">Locate all the divs in front of the last div and give them a class.</span></h4>
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<pre><code class="example demo-code"><!DOCTYPE html>
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<html>
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<head>
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<style>
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div { width:70px; height:70px; background:#abc;
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border:2px solid black; margin:10px; float:left; }
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div.before { border-color: red; }
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</style>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<div></div>
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<div></div>
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<div></div>
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<div></div>
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<script>$("div:last").prevAll().addClass("before");</script>
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</body>
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</html></code></pre>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></div>
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</div>
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</div>
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</div>
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</body></html> |