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82 lines
No EOL
3.5 KiB
HTML
82 lines
No EOL
3.5 KiB
HTML
<!DOCTYPE html>
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<html lang='en'><head>
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<meta charset="utf-8" /><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
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<div data-role="page">
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<div data-role="header">
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<h1>.offsetParent()</h1>
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</div>
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<div data-role="content" data-theme="c" id="offsetParent1">
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<h2 class="jq-clearfix roundTop section-title">
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<span class="name">.offsetParent()</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 the closest ancestor element that is positioned.</p>
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<ul class="signatures"><li class="signature" id="offsetParent"><h4 class="name">
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<span class="versionAdded">version added: <a href="/category/version/1.26/">1.26</a></span>.offsetParent()</h4></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>.offsetParent()</code> method allows us to search through the ancestors of these elements in the DOM tree and construct a new jQuery object wrapped around the closest positioned ancestor. An element is said to be positioned if it has a CSS position attribute of <code>relative</code>, <code>absolute</code>, or <code>fixed</code>. This information is useful for calculating offsets for performing animations and placing objects on the page.</p>
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<p>Consider a page with a basic nested list on it, with a positioned element:</p>
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<pre>
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<ul class="level-1">
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<li class="item-i">I</li>
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<li class="item-ii" style="position: relative;">II
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<ul class="level-2">
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<li class="item-a">A</li>
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<li class="item-b">B
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<ul class="level-3">
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<li class="item-1">1</li>
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<li class="item-2">2</li>
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<li class="item-3">3</li>
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</ul>
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</li>
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<li class="item-c">C</li>
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</ul>
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</li>
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<li class="item-iii">III</li>
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</ul>
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</pre>
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<p>If we begin at item A, we can find its positioned ancestor:</p>
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<pre>$('li.item-a').offsetParent().css('background-color', 'red');</pre>
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<p>This will change the color of list item II, which is positioned.</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">Find the offsetParent of item "A."</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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<script src="http://code.jquery.com/jquery-latest.js"></script>
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</head>
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<body>
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<ul class="level-1">
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<li class="item-i">I</li>
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<li class="item-ii" style="position: relative;">II
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<ul class="level-2">
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<li class="item-a">A</li>
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<li class="item-b">B
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<ul class="level-3">
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<li class="item-1">1</li>
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<li class="item-2">2</li>
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<li class="item-3">3</li>
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</ul>
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</li>
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<li class="item-c">C</li>
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</ul>
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</li>
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<li class="item-iii">III</li>
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</ul>
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<script>$('li.item-a').offsetParent().css('background-color', 'red');</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" rel="250"></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> |