jQuery callbacks.has()Method
jQuery Miscellaneous MethodsExample
Use callbacks.has() to check whether a callback has been added to the list
$(function () {
//A simple function that will be added to the list
var foo = function( value1, value2 ) {
alert( "Received: " + value1 + "," + value2 );
};
// a second function which will not be added to the list
var bar = function( value1, value2 ) {
alert( "foobar" );
}
var callbacks = $.Callbacks();
//Add the function to the list
callbacks.add( foo );
alert( callbacks.has( foo ) );
// true
alert( callbacks.has( bar ) );
// false
})
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Definition and Usage
The callbacks.has() function is used to determine whether a callback function has been added to the callback list.
Syntax
callbacks.has( callback )
| Parameters | Description |
|---|---|
| callback | Function type The callback function to search for |
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