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?

The only clean solutions suppose that asyncCall itself can accept a callback or post an even somehow when it finishes. — Denys Séguret
– Denys Séguret, Commented Jul 31, 2013 at 9:26
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. — Johny Jaz
– Johny Jaz, Commented Jul 31, 2013 at 9:28

Daniele · Accepted Answer · 2013-07-31 09:55:56Z

1

Try the jquery $.when jQuery API

Something like this:

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

edited Jul 31, 2013 at 9:55

answered Jul 31, 2013 at 9:32

Daniele

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3 Comments

Johny Jaz Over a year ago

hmm i get this error : Uncaught SyntaxError: Unexpected token (

Daniele Over a year ago

I edited the answer, it seems that this could be the correct sintax, let me know.

Johny Jaz Over a year ago

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

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