jQuery.isFunction()

jQuery

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jQuery.isFunction()

Categories: Utilities

jQuery.isFunction( obj ) Returns: boolean

Description: Determine if the argument passed is a Javascript function object.

  • version added: 1.2jQuery.isFunction( obj )

    • obj
      Type: PlainObject
      Object to test whether or not it is a function.

Note: As of jQuery 1.3, functions provided by the browser like alert() and DOM element methods like getAttribute() are not guaranteed to be detected as functions in browsers such as Internet Explorer.

Examples:

Example: Test a few parameter examples.

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                                        <!DOCTYPE html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <html>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <head>
                                      
                                    

                                  

                                  

                                    

                                        <style>
                                    

                                  

                                  

                                    

                                        div { color:blue; margin:2px; font-size:14px; }
                                    

                                  

                                  

                                    

                                        span { color:red; }
                                    

                                  

                                  

                                    

                                        </style>
                                    

                                  

                                  

                                    

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

                                  

                                  

                                    

                                      
                                        </head>
                                      
                                    

                                  

                                  

                                    

                                      
                                        <body>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                        <div>jQuery.isFunction(objs[0]) = <span></span></div>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                        <div>jQuery.isFunction(objs[1]) = <span></span></div>
                                    

                                  

                                  

                                    

                                        <div>jQuery.isFunction(objs[2]) = <span></span></div>
                                    

                                  

                                  

                                    

                                        <div>jQuery.isFunction(objs[3]) = <span></span></div>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                        <div>jQuery.isFunction(objs[4]) = <span></span></div>
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        <script>
                                        
                                      
                                    

                                  

                                  

                                    

                                      
                                        function stub() {
                                      
                                    

                                  

                                  

                                    

                                      }
                                    

                                  

                                  

                                    

                                      var objs = [
                                    

                                  

                                  

                                    

                                            function () {},
                                    

                                  

                                  

                                    

                                            { x:15, y:20 },
                                    

                                  

                                  

                                    

                                            null,
                                    

                                  

                                  

                                    

                                            stub,
                                    

                                  

                                  

                                    

                                            "function"
                                    

                                  

                                  

                                    

                                          ];
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      jQuery.each(objs, function (i) {
                                    

                                  

                                  

                                    

                                        var isFunc = jQuery.isFunction(objs[i]);
                                    

                                  

                                  

                                    

                                        $("span").eq(i).text(isFunc);
                                    

                                  

                                  

                                    

                                      });
                                    

                                  

                                  

                                    

                                      
                                        </script>
                                      
                                    

                                  

                                  

                                    

                                       
                                    

                                  

                                  

                                    

                                      
                                        </body>
                                      
                                    

                                  

                                  

                                    

                                      
                                        </html>

Example: Finds out if the parameter is a function.

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                                      $.isFunction(function(){});

Result:

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                                        true
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