Greasemonkey/Tampermonkey script to show hidden cateogry IDs on Kijiji.ca

kijiji_show_cat_id.user.js

// ==UserScript==
// @name         Kijiji show category ID
// @namespace    KijijiScripts
// @version      0.5
// @description  Add an indicator to show decoded location IDs and category IDs in the breadcrumb nav list (not normally visible)
// @match        https://www.kijiji.ca/*
// @grant        none
// ==/UserScript==

(function() {
    if (document.querySelector('div[class^="breadcrumbs-"]')) {
        var breadcrumUrls = document.querySelectorAll('a[class^="crumbLink-"]');
        for (var i = 0; i < breadcrumUrls.length; i++) {
            var s = document.createElement("strong");

            // Extract out the 'ID' section from the url which is the part after the right most slash
            var id = breadcrumUrls[i].href.split('/')[breadcrumUrls[i].href.split('/').length - 1];

            // Check if ID string contains an 'l' char or not
            // if it does it must be a category ID and if not it must be a location ID
            if (id.indexOf('l') >= 0) {
                // eg. id could be 'c128l1700212' where the integer between the 'c' and 'l' chars is the category ID
                s.innerHTML = " (CatId " + id.split('c').pop().split('l').shift() + ")";
            } else {
                s.innerHTML = " (LocId " + id + ")";
            }

            breadcrumUrls[i].parentNode.appendChild(s);
        }
    }
})();