.offsetParent()

jQuery

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.offsetParent()

Categories: Offset | Traversing > Tree Traversal

.offsetParent() Returns: jQuery

Description: Get the closest ancestor element that is positioned.

  • version added: 1.2.6.offsetParent()

    • This method does not accept any arguments.

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:

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                                      <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:

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                                    $('li.item-a').offsetParent().css('background-color', 'red');

This will change the color of list item II, which is positioned.

Example:

Find the offsetParent of item "A."

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                                        <!DOCTYPE html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <head>
                                      
                                    

                                  

                                  

                                    

                                        <script src="http://code.jquery.com/jquery-latest.js"></script>
                                    

                                  

                                  

                                    

                                      
                                        </head>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <body>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        <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>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <script>
                                        $('li.item-a').offsetParent().css('background-color', 'red');
                                        </script>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        </body>
                                      
                                    

                                  

                                  

                                    

                                      
                                        </html>
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