loadmore.js

var isClicked = false;
var btn = document.querySelector('.btn.iso-load-more');
var isInViewport = function (elem) {
    var bounding = elem.getBoundingClientRect();
    return (
        bounding.top >= 0 &&
        bounding.left >= 0 &&
        bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
        bounding.right <= (window.innerWidth || document.documentElement.clientWidth)
    );
};
window.onscroll = function(ev) {
    if (isInViewport(btn) && isClicked==false) {
        isClicked=true;
		btn.click();
		setTimeout(function(){
			isClicked=false;
		}, 1200);
    }
};