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<?xml version="1.0"?>
<entry name="callbacks.has" type="method" return="Boolean">
<argument name="callback" type="Function">
<desc>The callback to search for.</desc>
<desc>Determine whether a supplied callback is in a list</desc>
<desc>Use <code>callbacks.has()</code> to check if a callback list contains a specific callback:</desc>
<code><![CDATA[// a sample logging function to be added to a callbacks list
var foo = function( value1, value2 ) {
console.log( "Received: " + value1 + "," + value2 );
// a second function which will not be added to the list
var bar = function( value1, value2 ) {
console.log( "foobar" );
var callbacks = $.Callbacks();
// add the log method to the callbacks list
callbacks.add( foo );
// determine which callbacks are in the list
console.log( callbacks.has( foo ) );
// true
console.log( callbacks.has( bar ) );
// false
<category slug="callbacks-object"/>
<category slug="version/1.7"/>
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