// a sample logging function to be added to a callbacks list
                                      
                                    
                                  
                                  

                                    

                                      var foo = function( value ) {
                                    
                                  
                                  

                                    

                                        console.log( "foo: " + value);
                                    
                                  
                                  

                                    

                                      };
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      var callbacks = $.Callbacks();
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      
                                        // add the logging function to the callback list
                                      
                                    
                                  
                                  

                                    

                                      callbacks.add( foo );
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      
                                        // fire the items on the list, passing an argument
                                      
                                    
                                  
                                  

                                    

                                      callbacks.fire( "hello" );
                                    
                                  
                                  

                                    

                                      
                                        // outputs "foo: hello"
                                      
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      
                                        // lock the callbacks list
                                      
                                    
                                  
                                  

                                    

                                      callbacks.lock();
                                    
                                  
                                  

                                    

                                       
                                    
                                  
                                  

                                    

                                      
                                        // test the lock-state of the list
                                      
                                    
                                  
                                  

                                    

                                      console.log ( callbacks.locked() );
                                    
                                  
                                  

                                    

                                      
                                        // true