:first Selector

jQuery

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:first Selector

Categories: Selectors > Basic Filter | Selectors > jQuery Extensions

first selector

Description: Selects the first matched element.

  • version added: 1.0jQuery( ":first" )

The :first pseudo-class is equivalent to :eq(0). It could also be written as :lt(1). While this matches only a single element, :first-child can match more than one: One for each parent.

Additional Notes:

  • Because :first is a jQuery extension and not part of the CSS specification, queries using :first cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :first to select elements, first select the elements using a pure CSS selector, then use .filter(":first").
  • Selected elements are in the order of their appearance in the document.

Example:

Finds the first table row.

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                                        <!DOCTYPE html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <head>
                                      
                                    

                                  

                                  

                                    

                                        <style>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                        td { color:blue; font-weight:bold; }
                                    

                                  

                                  

                                    

                                        </style>
                                    

                                  

                                  

                                    

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

                                  

                                  

                                    

                                      
                                        </head>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <body>
                                      
                                    

                                  

                                  

                                    

                                        <table>
                                    

                                  

                                  

                                    

                                          <tr><td>Row 1</td></tr>
                                    

                                  

                                  

                                    

                                          <tr><td>Row 2</td></tr>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                          <tr><td>Row 3</td></tr>
                                    

                                  

                                  

                                    

                                        </table>
                                    

                                  

                                  

                                    

                                      
                                        <script>
                                        $("tr:first").css("font-style", "italic");
                                        </script>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        </body>
                                      
                                    

                                  

                                  

                                    

                                      
                                        </html>
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