jQuery: Check the lock-state of a callback list

Last update on August 19 2022 21:51:35 (UTC/GMT +8 hours)

jQuery Fundamental - II: Exercise-51

Check the lock-state of a callback list.

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>Check  the lock-state of a callback list.</title>
  </head>
  <body>
</body>
  </html>

JavaScript Code :

// A sample function f1 
var foo = function( value ) {
  console.log( "foo: " + value );
};
 
var callbacks = $.Callbacks();
 
// Add f1 to the callback list
callbacks.add( foo );
 
// Fire the items on the list, passing an argument
callbacks.fire( "JavaScript" );
 
// Lock the callbacks list
callbacks.lock();
 
// Test the lock-state of the list
console.log ( callbacks.locked() );
// true

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