Javascript out function
function foo(arg, ajaxcomplete) {
    $.ajax({
    //ajaxcall...
    success: function() {
        //set ajaxcomplete to true
    }
}

function foo(arg, ajaxcomplete) {
        $.ajax({
            success: function() {
                alert('O.K.');
            },
            complete: function(){
                alert('We are done');
            }
        });
    }

function foo(arg, ajaxcomplete) {
  $.ajax({
    //ajaxcall...
    complete: function() {
      ajaxcomplete();
      // Some other code here if required
    }
  }

var isComplete = false;
foo('someArg', function() { isComplete = true; });

function foo(arg, ajaxcomplete) {
    $.ajax({
    //ajaxcall...
    success: function() {

    },
    complete: function(){
        //set ajaxcomplete to true here
    }
}