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.
An integer indicating the 0-based position of the element.
An integer indicating the position of the element, counting backwards from the last element in the set.
Turn the div with index 2 blue by adding an appropriate class.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>eq demo</title>
<style>
div {
width: 60px;
height: 60px;
margin: 10px;
float: left;
border: 2px solid blue;
}
.blue {
background: blue;
}
</style>
<script src="https://code.jquery.com/jquery-1.10.2.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>
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