.prevAll()

jQuery

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.prevAll()

Categories: Traversing > Tree Traversal

.prevAll( [selector ] ) Returns: jQuery

Description: Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.

  • version added: 1.2.prevAll( [selector ] )

    • selector
      Type: Selector
      A string containing a selector expression to match elements against.

Given a jQuery object that represents a set of DOM elements, the .prevAll() method searches through the predecessors of these elements in the DOM tree and construct a new jQuery object from the matching elements; the elements are returned in order beginning with the closest sibling.

The method optionally accepts a selector expression of the same type that we can pass to the $() function. If the selector is supplied, the elements will be filtered by testing whether they match it.

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 class="third-item">list item 3</li>
                                  

                                

                                

                                  

                                       <li>list item 4</li>
                                  

                                

                                

                                  

                                       <li>list item 5</li>
                                  

                                

                                

                                  

                                    
                                      </ul>

If we begin at the third item, we can find the elements which come before it:

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                                    $('li.third-item').prevAll().css('background-color', 'red');

The result of this call is a red background behind items 1 and 2. Since we do not supply a selector expression, these preceding elements are unequivocally included as part of the object. If we had supplied one, the elements would be tested for a match before they were included.

Example:

Locate all the divs preceding the last div and give them a class.

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                                        <!DOCTYPE html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <head>
                                      
                                    

                                  

                                  

                                    

                                        <style>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                        div { width:70px; height:70px; background:#abc;
                                    

                                  

                                  

                                    

                                              border:2px solid black; margin:10px; float:left; }
                                    

                                  

                                  

                                    

                                        div.before { border-color: red; }
                                    

                                  

                                  

                                    

                                        </style>
                                    

                                  

                                  

                                    

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

                                  

                                  

                                    

                                      
                                        </head>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <body>
                                      
                                    

                                  

                                  

                                    

                                        <div></div>
                                    

                                  

                                  

                                    

                                        <div></div>
                                    

                                  

                                  

                                    

                                        <div></div>
                                    

                                  

                                  

                                    

                                        <div></div>
                                    

                                  

                                  

                                    

                                      
                                        <script>
                                        $("div:last").prevAll().addClass("before");
                                        </script>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        </body>
                                      
                                    

                                  

                                  

                                    

                                      
                                        </html>
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