.eq()
.eq( index ) Returns: jQuery
Description: Reduce the set of matched elements to the one at the specified index.
-
version added: 1.1.2.eq( index )
indexAn integer indicating the 0-based position of the element.
-
version added: 1.4.eq( -index )
-indexAn integer indicating the position of the element, counting backwards from the last element in the set.
Given a jQuery object that represents a set of DOM elements, the .eq() method constructs a new jQuery object from one element within that set. The supplied index identifies the position of this element in the set.
Consider a page with a simple list on it:
<ul>
<li>list item 1</li>
<li>list item 2</li>
<li>list item 3</li>
<li>list item 4</li>
<li>list item 5</li>
</ul>
We can apply this method to the set of list items:
$('li').eq(2).css('background-color', 'red');
The result of this call is a red background for item 3. Note that the supplied index is zero-based, and refers to the position of the element within the jQuery object, not within the DOM tree.
Providing a negative number indicates a position starting from the end of the set, rather than the beginning. For example:
$('li').eq(-2).css('background-color', 'red');
This time list item 4 is turned red, since it is two from the end of the set.
If an element cannot be found at the specified zero-based index, the method constructs a new jQuery object with an empty set and a length property of 0.
$('li').eq(5).css('background-color', 'red');
Here, none of the list items is turned red, since .eq(5) indicates the sixth of five list items.
Example:
Turn the div with index 2 blue by adding an appropriate class.
<!DOCTYPE html>
<html>
<head>
<style>
div { width:60px; height:60px; margin:10px; float:left;
border:2px solid blue; }
.blue { background:blue; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
$("body").find("div").eq(2).addClass("blue");
</script>
</body>
</html>