$(window).scroll(function() {
        if(($(window).scrollTop() + $(window).height() >= $(document).height())  ){
            //*Load More data function
        }
}

$(function () {
$("#iframeid").load(function () {
    var iframe = document.getElementById("iframeid").contentWindow;
    $(iframe).scroll(function () {
        if (   $(iframe).scrollTop()==$(iframe).height()-$("#iframeid").height()) {
            alert("Reached bottom!");
        }
    });
});
})