Javascript callback functions with ajax

Question

I am writing a generic function that will be reused in multiple places in my script.

The function uses ajax (using jQuery library) so I want to somehow pass in a fun

Answer 1

This would be better done with jQuery's Deferred Objects. Have your AJAX call return the jqXHR object.

function getNewENumber(parentENumber) {
    return $.ajax( { ... } );
}

getNewENumber(E1 - 3).then(success_callback, error_callback);

If you want to keep the error callback within that function you can register that there instead:

function getNewENumber(parentENumber) {
    var jqXHR = $.ajax( { ... } );
    jqXHR.fail( ... );
    return jqXHR;
}

getNewENumber(E1 - 3).done(success_callback);