Pass a JavaScript function as parameter

You just need to remove the parenthesis:

addContact(entityId, refreshContactList);

This then passes the function without executing it first.

Here is an example:

function addContact(id, refreshCallback) {    refreshCallback();    // You can also pass arguments if you need to    // refreshCallback(id);}function refreshContactList() {    alert('Hello World');}addContact(1, refreshContactList);

If you want to pass a function, just reference it by name without the parentheses:

function foo(x) {    alert(x);}function bar(func) {    func("Hello World!");}//alerts "Hello World!"bar(foo);

But sometimes you might want to pass a function with arguments included, but not have it called until the callback is invoked. To do this, when calling it, just wrap it in an anonymous function, like this:

function foo(x) {   alert(x);}function bar(func) {   func();}//alerts "Hello World!" (from within bar AFTER being passed)bar(function(){ foo("Hello World!") });

If you prefer, you could also use the apply function and have a third parameter that is an array of the arguments, like such:

function eat(food1, food2){    alert("I like to eat " + food1 + " and " + food2 );}function myFunc(callback, args){    //do stuff    //...    //execute callback when finished    callback.apply(this, args);}//alerts "I like to eat pickles and peanut butter"myFunc(eat, ["pickles", "peanut butter"]); 

Example 1:

funct("z", function (x) { return x; });function funct(a, foo){    foo(a) // this will return a}

Example 2:

function foodemo(value){    return 'hello '+value;}function funct(a, foo){    alert(foo(a));}//call funct    funct('world!',foodemo); //=> 'hello world!'

look at this