Spy Depth Scroll

spytracker.js

/**
 * Track depth scroll
 */
var currentDepthScroll = 0;

function trackDepthScroll() {

    var bottom  = window.pageYOffset + window.innerHeight;
    var height  = document.documentElement.clientHeight;
    var percent = (bottom/height)*100;
    var done25 = false;
    var done50 = false;
    var done75 = false;
    var done100 = false;

    if (percent >= 25 && currentDepthScroll < 25 && done25 == false) {
        done25 = true;
        currentDepthScroll = 25;
        console.log("GA Type : "+ window.GAPageType);
        console.log('Scroll Depth 25%');
    }

    if (percent >= 50 && currentDepthScroll < 50 && done50 == false) {
        done50 = true;
        currentDepthScroll = 50;
        console.log('Scroll Depth 50%');
    }

    if (percent >= 75 && currentDepthScroll < 75 && done75 == false) {
        done75 = true;
        currentDepthScroll = 89;
        console.log('Scroll Depth 75%');
    }

    if (percent >= 100 && currentDepthScroll < 99 && done100 == false) {
        done100 = true;
        currentDepthScroll = 100;
        console.log('Scroll Depth 100%');
    }

}