MediaWiki:Common.js: Difference between revisions

Revision as of 17:14, 22 June 2019

/* Any JavaScript here will be loaded for all users on every page load. */

/*
 * Hide the navigation bar on scroll down (page push up).
 * Common.css needs to contain navbar { transition: top 0.5s; } or similar.
 */
var previousScrollPoint = 0;
window.onscroll = function() {
    var currentScrollPoint = window.scrollY || document.documentElement.scrollTop || document.body.scrollTop;

    if (previousScrollPoint - currentScrollPoint < 40 &&
        previousScrollPoint - currentScrollPoint > -40) {
        return;
    }
    
    if ( previousScrollPoint > currentScrollPoint ||
         1 > currentScrollPoint ) {
        document.getElementById("page-banner").style.display = "block";
        document.getElementById("mw-navigation").style.top = "0";
    } else {
        document.getElementById("page-banner").style.display = "none";
        document.getElementById("mw-navigation").style.top = "-50px";
    }
    previousScrollPoint = currentScrollPoint;
}