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Throttle method that is triggered by user scroll.
var scheduled = false,
_throttleDelay = 200;
function ScrollHandler(e) {
//throttle event:
if (!scheduled) {
scheduled = true;
setTimeout(function () {
//do work
if ($(window).scrollTop() + $(window).height() > $(document).height() - 100) {
alert("near bottom!");
// Allow method to run again when user scrolls next time.
scheduled = false;
}, _throttleDelay);
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