.offsetParent()
Categories: Tree Traversal | Offset
.offsetParent()Returns: jQuery
Description: Get the closest ancestor element that is positioned.
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.offsetParent()
version added: 1.0
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.
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Find the offsetParent of item "A."
HTML:
<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>
Code:
$('li.item-a').offsetParent().css('background-color', 'red');