how to produce a delay effect

Question

I have a loop with in a loop like this

$.each(requiredCities,function(keya,valb){
 $.each(requiredKeyWords,function(keya,valb){
  download(keya,valb);
 });
});

I want this download function to be called every 2 seconds. The problem is im unable to use setTimeout.

Answer 1

Do this:

var i=1;
$.each(requiredCities,function(keya,valb){
 $.each(requiredKeyWords,function(keya,valb){
    var timerId = setInterval(function(){
       download(keya,valb);
       clearInterval(timerId);
    }, 2000*(i++));    
 });
});

Cheers