OA: Fix timesheet exception bug (Tampermonkey)

fix_schedule_exception.js

// ==UserScript==
// @name         DEMO: Hide OpenAir schedule exception icons (bug workaround; 17 Jul 2020)
// @namespace    http://rymo.io/
// @version      0.1
// @description  DEMO: Hides all schedule exception icons on the timesheet.
// @author       @rymoio
// @match        https://demo.openair.com/timesheet.pl?*
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    window.addEventListener('load', function() {
        console.log("DEBUG >>> Greasemonkey script start...");

        // callback executed when canvas was found
        function handleElem(elem) {
            var klassName = "scheduleException";
            var elems = document.getElementsByClassName(klassName);
            for (var i=0, len=elems.length|0; i<len; i=i+1|0) {
                elems[i].style.display = "none";
                console.log(`Hiding ${i+1} icon${i ? "s" : ""}`);
            }
        }

        // set up the mutation observer
        var observer = new MutationObserver(function (mutations, me) {
          // `mutations` is an array of mutations that occurred
          // `me` is the MutationObserver instance
          var elem = document.getElementById('timesheet_header_lower');
          if (elem) {
            handleElem(elem);
            me.disconnect(); // stop observing
            console.log("DEBUG >>> Greasemonkey script end.");
            return;
          }
        });

        // start observing
        observer.observe(document, {
          childList: true,
          subtree: true
        });


    }, false);

})();