jQuery callbacks.has() Method
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jQuery callbacks.has() Method
The jQuery callbacks.has()
method returns whether the callbacks has the specified function.
Note: $.Callbacks() is a multi-purpose callbacks list object that provides a powerful way to manage callback lists.
Example
HTML Editor
<!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.has() 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");
console.log("foo called : " +callbacks.has(foo));
console.log("bar called : " +callbacks.has(bar));
function foo(value){
console.log("foo : " +value);
}
function bar(value){
console.log("bar : " +value);
}
});
});
</script>
</body>
</html>
Syntax
callbacks.has(func);
Parameter Values
Value | Type | Explanation |
---|---|---|
func | Required | Specifies the callbacks to search for. |
Return Value
Value | Explanation |
---|---|
true | If the callbacks has the specified function. |
false | If the callbacks does not has the specified function. |
Reminder
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