jQuery callbacks.fired() Method

Last Updated : 10 Jul, 2020

The jQuery callbacks.fired() method is used to check if the callbacks have already been called at least once. This method returns the boolean value.

Syntax:

callbacks.fired()

Parameters: This method does not accept any arguments.

Return Value: This method returns a Boolean value.

Example 1: This example returns true because the fire() method has been called at least once.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <script src= 
"https://code.jquery.com/jquery-3.5.0.js"> 
    </script> 
</head> 
  
<body style="text-align:center;"> 
    <h1 style="color:green;"> 
        GeeksForGeeks 
    </h1> 
  
    <p> 
        JQuery | callbacks.fired() method 
    </p> 
  
    <button onclick="Geeks();"> 
        click here 
    </button> 
      
    <p id="GFG_DOWN"></p> 
  
    <script> 
        var el_down = document.getElementById("GFG_DOWN"); 
        var res = ""; 
        var callbacks = jQuery.Callbacks(); 
  
        function Geeks() { 
  
            // First function to be added to the list 
            var fun1 = function (val) { 
                res = res + "This is function 1 and" 
                    + " value passed is " + val + "<br>"; 
            }; 
  
            // Adding the function 1 
            callbacks.add(fun1); 
              
            // Calling with "GFG_1" 
            callbacks.fire("GFG_1"); 
              
            // Calling callbacks.fired() 
            // method to get true 
            el_down.innerHTML = callbacks.fired(); 
        }  
    </script> 
</body> 
  
</html> 

Output:

Example 2: This example returns false because the fire() method hasn’t been called.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <script src= 
"https://code.jquery.com/jquery-3.5.0.js"> 
    </script> 
</head> 
  
<body style="text-align:center;"> 
    <h1 style="color:green;"> 
        GeeksForGeeks 
    </h1> 
  
    <p> 
        JQuery | callbacks.fired() method 
    </p> 
  
    <button onclick="Geeks();"> 
        click here 
    </button> 
      
    <p id="GFG_DOWN"></p> 
  
    <script> 
        var el_down = document.getElementById("GFG_DOWN"); 
        var res = ""; 
        var callbacks = jQuery.Callbacks(); 
  
        function Geeks() { 
  
            // First function to be added to the list 
            var fun1 = function (val) { 
                res = res + "This is function 1 and" 
                + " value passed is " + val + "<br>"; 
            }; 
  
            // Adding the function 1 
            callbacks.add(fun1); 
              
            // Adding again 
            callbacks.add(fun1); 
              
            // Calling callbacks.fired() but  
            // This time we will get false 
            el_down.innerHTML = callbacks.fired(); 
        }  
    </script> 
</body> 
  
</html> 