jQuery callbacks.add() Method
jQuery callbacks.add() Method
The jQuery callbacks.add() method adds a callback or a collection of callbacks to a callback list.
Note: $.Callbacks() is a multi-purpose callbacks list object that provides a powerful way to manage callback lists.
In the following example, we add the functions foo and bar to the callbacks list and then fire it with a parameter value.
Example
<!DOCTYPE html>
<html lang="en-US">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<h1>jQuery callbacks.add() Method</h1>
<p>Click on the button and check your console.</p>
<button>Click Me</button>
<script>
$(document).ready(function(){
$("button").click(function(){
var callbacks = $.Callbacks();
callbacks.add(foo);
callbacks.add(bar);
callbacks.fire("hello");
function foo(value){
console.log("foo : " +value);
}
function bar(value){
console.log("bar : " +value);
}
});
});
</script>
</body>
</html>
Syntax
Parameter Values
| Value | Type | Explanation |
|---|
| func | Required | Specifies a function, or array of functions, that are to be added to the callbacks list. |
Deep Understanding
The following example will fire foo function for 2 times and bar function for just 1 time.
Example
<!DOCTYPE html>
<html lang="en-US">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<h1>jQuery callbacks.add() Method</h1>
<p>Click on the button and check your console.</p>
<button>Click Me</button>
<script>
$(document).ready(function(){
$("button").click(function(){
var callbacks = $.Callbacks();
callbacks.add(foo);
callbacks.fire("hello foo");
callbacks.add(bar);
callbacks.fire("hello bar");
function foo(value){
console.log("foo : " +value);
}
function bar(value){
console.log("bar : " +value);
}
});
});
</script>
</body>
</html>
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