Load ajax when scroll reaches 80%

Question

I am using the following code which is working when the scroll bar reaches the botttom,

if($(window).scrollTop() == $(document).height() - $(window).height(         


        

Answer 1

A quick google search for get percentage scrolled down brings up this page as the first result(with the code below, which more or less does what you want). I feel like you didn't attempt any research before asking here.

$(document).scroll(function(e){

    // grab the scroll amount and the window height
    var scrollAmount = $(window).scrollTop();
    var documentHeight = $(document).height();

    // calculate the percentage the user has scrolled down the page
    var scrollPercent = (scrollAmount / documentHeight) * 100;

    if(scrollPercent > 50) {
        // run a function called doSomething
       doSomething();
    }

    function doSomething() { 

        // do something when a user gets 50% of the way down my page

    }

});