jQuery: Check if the callbacks have already been called at least once

Last update on August 19 2022 21:50:45 (UTC/GMT +8 hours)

jQuery Fundamental - I : Exercise-47

Using jQuery check if the callbacks have already been called at least once.

Sample solution :

HTML Code :

<!DOCTYPE html>
  <html>
  <head>
  <script src="https://code.jquery.com/jquery-git.js"></script>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Using jQuery check if the callbacks have already been called at least once.</title>
  </head>
  <body>
</body>
  </html>

JavaScript Code :

// A sample  function f1
var f1 = function( value ) {
  console.log( "f1:" + value );
};
 
var callbacks = $.Callbacks();
 
// Add the function "f1" to the list
callbacks.add(f1);
 
// Fire the items on the list
callbacks.fire("JavaScript" ); 
callbacks.fire( "jquery" ); 
 
// Test if the callbacks have been called
console.log( callbacks.fired() );

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