ScrollTrackingUtag/scrollTracking at master · Knapstad/ScrollTrackingUtag · GitHub

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(function(){
var scrolledPast75 = false;
var scrolledPast50 = false;
var scrolledPast25 = false;
var scrolledTo100  = false;

var startscroll = Date.now();


polls = window.setInterval(function()
{
try {
		var winmax = document.body.scrollHeight - window.innerHeight
    		scrolled = window.pageYOffset/winmax;

	if ( scrolled > 0.97 && scrolledTo100 == false){
		scrolledTo100 = true;
		scrolled100Time=Date.now();
		utag.link({
			event_category:"Scroll Depth",
    		event_action:"Scroll",
    		event_label:"100%",
    		event_value:(1).toFixed(0),
    		time_to_action: ((scrolled100Time-startscroll)/100/60).toFixed(2),
    		pixel_depth: (window.innerHeight).toFixed(0)
  		});


    }
	if(  scrolled > 0.75 && scrolledPast75 == false){
		scrolledPast75 = true;
		scrolled75Time=Date.now();
		utag.link({
			event_category:"Scroll Depth",
    		event_action:"Scroll",
    		event_label:"75%",
    		event_value: (1).toFixed(0),
    		time_to_action: ((scrolled75Time-startscroll)/100/60).toFixed(2),
    		pixel_depth: (window.innerHeight).toFixed(0)
  		});

    }
	if(scrolled > 0.50 && scrolledPast50 == false){
		scrolledPast50 = true;
		scrolled50Time=Date.now();
		utag.link({
			event_category:"Scroll Depth",
    		event_action:"Scroll",
    		event_label:"50%",
    		event_value: (1).toFixed(0),
    		time_to_action: ((scrolled50Time-startscroll)/100/60).toFixed(2),
    		pixel_depth: (window.innerHeight).toFixed(0)
  		});


    }
    if(scrolled > 0.25 && scrolledPast25 == false){
		scrolledPast25 = true;
		scrolled25Time=Date.now();
		utag.link({
			event_category:"Scroll Depth",
    		event_action:"Scroll",
    		event_label:"25%",
    		event_value: (1).toFixed(0),
    		time_to_action: ((scrolled25Time-startscroll)/100/60).toFixed(2),
    		pixel_depth: (window.innerHeight).toFixed(0)
  		});

    }
    if(scrolledPast75 == true && scrolledPast50 == true && scrolledPast25 == true && scrolledTo100 == true){
    window.clearInterval(polls);
    }
    }
catch (err){
}
}, 500);
})(window);