Wait/Pause/Sleep in jQuery Each Loop between Iterations

Question

I simply want to add a pause after each iteration of a jQuery each loop, I can't seem to figure it out.

$(".item").each(function(i){
    var el = this;
    var timer = setTimeout(function(){
        $(el).trigger("click");
    }, 500);
});

This is not firing every 1/2 second, but rather triggering click on all items at once.

I want something like this (pseudocode):

$(".item").each(function(i){
    $(this).trigger("click");
    wait(500); // wait a half second before the next iteration
});

Any working method of this?

Answer 1

You cannot really do this with $.each. You can use setTimeout and keep a reference to the index you are currently at:

function process(elements, cb, timeout) {
    var i = 0;
    var l = elements.length;

    (function fn() {
        cb.call(elements[i++]);
        if (i < l) {
            setTimeout(fn, timeout);
        }
    }());
}

process($('.item'), function() {
    $(this).click();
}, 500);

Answer 2

Hiya try this or you can write your a SetTimeOUt function which you already tried

Demo => http://jsfiddle.net/Yq2SL/2/ you will see different parent of div with class=item

API: http://api.jquery.com/jQuery.dequeue/ & http://api.jquery.com/jQuery.queue/#jQuery-queue1

Few sources for your read:

http://forum.jquery.com/topic/delay-and-click-issue

http://blog.project-sierra.de/archives/1559

Hope it helps :)

Sample code:

$(".item").delay(500).queue(function(){ 
  $(this).trigger("click"); 
  $(this).dequeue(); 
});