mirror of
https://github.com/Hopiu/jquery-mobile.git
synced 2026-03-17 22:40:31 +00:00
83 lines
No EOL
3.5 KiB
HTML
83 lines
No EOL
3.5 KiB
HTML
<!DOCTYPE html>
|
|
<html lang='en'><head>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, minimum-scale=1, maximum-scale=1"><meta http-equiv='content-type' content='text/html; charset=UTF-8' /></head><body>
|
|
<div data-role="page">
|
|
<div data-role="header">
|
|
<h1>.offsetParent()</h1>
|
|
|
|
</div>
|
|
<div data-role="content" data-theme="c" id="offsetParent1">
|
|
<h2 class="jq-clearfix roundTop section-title">
|
|
<span class="name">.offsetParent()</span> <span class="returns">Returns: <a class="return" href="http://docs.jquery.com/Types#jQuery">jQuery</a></span>
|
|
</h2>
|
|
<div class=" entry-details">
|
|
<p class="desc"><strong>Description: </strong>Get the closest ancestor element that is positioned.</p>
|
|
<ul class="signatures"><li class="signature" id="offsetParent"><h4 class="name">
|
|
<span class="versionAdded">version added: <a href="/category/version/1.26/">1.26</a></span>.offsetParent()</h4></li></ul>
|
|
<div class="longdesc">
|
|
<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>
|
|
<p>Consider a page with a basic nested list on it, with a positioned element:</p>
|
|
<pre>
|
|
<ul class="level-1">
|
|
<li class="item-i">I</li>
|
|
<li class="item-ii" style="position: relative;">II
|
|
<ul class="level-2">
|
|
<li class="item-a">A</li>
|
|
<li class="item-b">B
|
|
<ul class="level-3">
|
|
<li class="item-1">1</li>
|
|
<li class="item-2">2</li>
|
|
<li class="item-3">3</li>
|
|
</ul>
|
|
</li>
|
|
<li class="item-c">C</li>
|
|
</ul>
|
|
</li>
|
|
<li class="item-iii">III</li>
|
|
</ul>
|
|
</pre>
|
|
<p>If we begin at item A, we can find its positioned ancestor:</p>
|
|
<pre>$('li.item-a').offsetParent().css('background-color', 'red');</pre>
|
|
<p>This will change the color of list item II, which is positioned.</p>
|
|
</div>
|
|
<h3>Example:</h3>
|
|
<div id="entry-examples" class="entry-examples"><div id="example-0">
|
|
<h4><span class="desc">Find the offsetParent of item "A."</span></h4>
|
|
<pre><code class="example demo-code"><!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<script src="http://code.jquery.com/jquery-latest.js"></script>
|
|
</head>
|
|
<body>
|
|
|
|
<ul class="level-1">
|
|
<li class="item-i">I</li>
|
|
<li class="item-ii" style="position: relative;">II
|
|
<ul class="level-2">
|
|
<li class="item-a">A</li>
|
|
<li class="item-b">B
|
|
<ul class="level-3">
|
|
<li class="item-1">1</li>
|
|
<li class="item-2">2</li>
|
|
<li class="item-3">3</li>
|
|
</ul>
|
|
</li>
|
|
<li class="item-c">C</li>
|
|
</ul>
|
|
</li>
|
|
<li class="item-iii">III</li>
|
|
</ul>
|
|
|
|
<script>$('li.item-a').offsetParent().css('background-color', 'red');</script>
|
|
</body>
|
|
</html></code></pre>
|
|
<h4>Demo:</h4>
|
|
<div class="demo code-demo" rel="250"></div>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
</body></html> |