Get the closest ancestor element that is positioned.
Given a jQuery object that represents a set of DOM elements, the .offsetParent() 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 relative, absolute, or fixed. This information is useful for calculating offsets for performing animations and placing objects on the page.
Consider a page with a basic nested list on it, with a positioned element:
<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>If we begin at item A, we can find its positioned ancestor:
$( "li.item-a" ).offsetParent().css( "background-color", "red" );
This will change the color of list item II, which is positioned.
version added: 1.2.6
This method does not accept any arguments.
Examples:
Find the offsetParent of item "A."
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>offsetParent demo</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
<ul class="level-1">
<li class="item-i">I</li>
<li class="item-ii" style="position: relative;">II
<ul class="level-2">
<li class="item-a">A</li>
<li class="item-b">B
<ul class="level-3">
<li class="item-1">1</li>
<li class="item-2">2</li>
<li class="item-3">3</li>
</ul>
</li>
<li class="item-c">C</li>
</ul>
</li>
<li class="item-iii">III</li>
</ul>
<script>$( "li.item-a" ).offsetParent().css( "background-color", "red" );</script>
</body>
</html>
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