.eq()

jQuery

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.eq()

Categories: Traversing > Filtering

.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 )

    • index
      Type: Integer
      An integer indicating the 0-based position of the element.

  • version added: 1.4.eq( -index )

    • -index
      Type: Integer
      An 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:

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                                      <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:

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                                      $('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:

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                                      $('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.

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                                      $('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.

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                                        <!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>
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