How to create a callback function in javascript/jquery

Question

I have some asynchronous API calls. I need to do some work when the calls have finished. I have all my API calls inside a function like that :

function startProcess() {
 asyncCall();
}

How do i create a callback function for the startProcess() function , so that i could run some code when the asyncCall has finished?

• Denys Séguret: The only clean solutions suppose that asyncCall itself can accept a callback or post an even somehow when it finishes.
• Johny Jaz: asyncCall has a callback function. The problem is that through the callback function asyncCall will be called a couple more times with different parameters. So i cant be sure through that callback function when it will finish. If you have time to see what i mean check this: stackoverflow.com/questions/17965124/… . This is my problem exactly.

Answer 1

Try the jquery $.when jQuery API

Something like this:

$.when( startProcess ).done(
 function() { /* do something */ }
);

• Johny Jaz: hmm i get this error : Uncaught SyntaxError: Unexpected token (
• Daniele: I edited the answer, it seems that this could be the correct sintax, let me know.
• Johny Jaz: is correct but if the call is asynchronous , that doesnt mean that it will wait for that call to finish. Thats what i am trying to accomplish. Thank you very much though