Chatre: get distance from bottom of scroll with jquery. Should console log distance from bottom when scrolling.

scrollFromBottom.js

let scrollBarHeight;

// ONLY RUN WHEN SCROLLED TO BOTTOM
window.scrollBarHeight = (document.querySelector("#messages").scrollHeight) - ($("#messages").height() + $("#messages").scrollTop());
// END OF ONLY RUN WHEN SCROLLED TO BOTTOM

$("#messages").scroll(() => {
    const a = document.querySelector("#messages").scrollHeight;
    const b = $("#messages").height() * 2;
    const c = $("#messages").height() - $("#messages").scrollTop();
    const d = window.scrollBarHeight;

    console.log(a - b + c - d);
});