.has()
Categories: Filtering
.has( selector )Returns: jQuery
Description: Reduce the set of matched elements to those that have a descendant that matches the selector or DOM element.
-
.has( selector )
version added: 1.0selector A string containing a selector expression to match elements against.
-
.has( contained )
version added: 1.0contained A DOM element to match elements against.
Given a jQuery object that represents a set of DOM elements, the .has()
method constructs a new jQuery object from a subset of the matching elements. The supplied selector is tested against the descendants of the matching elements; the element will be included in the result if any of its descendant elements matches the selector.
Consider a page with a nested list as follows:
<ul> <li>list item 1</li> <li>list item 2 <ul> <li>list item 2-a</li> <li>list item 2-b</li> </ul> </li> <li>list item 3</li> <li>list item 4</li> </ul>
We can apply this method to the set of list items as follows:
$('li').has('ul').css('background-color', 'red');
The result of this call is a red background for item 2, as it is the only <li>
that has a <ul>
among its descendants.
-
Check if an element is inside another.
HTML:
<ul><li>Does the UL contain an LI?</li></ul>
CSS:
.full { border: 1px solid red; }
Code:
$("ul").append("<li>" + ($("ul").has("li").length ? "Yes" : "No") + "</li>"); $("ul").has("li").addClass("full");