☰

TescoVegan

Always apply the vegan filter on tesco.com

  1.  
  2.     // ==UserScript==
  3.     // @name         TescoVegan
  4.     // @author       Ivy9217
  5.     // @version      1.0.6
  6.     // @description  Always apply the vegan filter on tesco.com
  7.     // @match        https://www.tesco.com/groceries/*
  8.     // @exclude      /https://www.tesco.com/groceries/en-GB/(products|trolley|slots|orders).*/
  9.     // @connect      tesco.com
  10.     // @run-at       document-end
  11.     // @namespace    https://greasyfork.org/users/982144
  12.     // @license      MIT
  13.     // ==/UserScript==
  14.  
  15.     // Content on the same page changes dynamically.
  16.     // It's not enough to change the page URL after load, we must use this instead
  17.     function observeDOM(callback) {
  18.         var mutationObserver = new MutationObserver(function(mutations) {
  19.             mutations.forEach(function(mutation) {
  20.                 callback(mutation)
  21.             });
  22.         });
  23.  
  24.         mutationObserver.observe(document.body, {
  25.             attributes: true,
  26.             childList: true,
  27.             subtree: true,
  28.             attributeFilter: ["class"]
  29.         });
  30.     }
  31.  
  32.     function appendUrlParameters(mutation) {
  33.  
  34.         var oldUrl = window.location.search;
  35.  
  36.         // Check if the filter is already applied
  37.         if (!/dietary=Vegan/.test(oldUrl)) {
  38.                 var newURL = window.location.protocol + "//" +
  39.                     window.location.host +
  40.                     window.location.pathname + "?dietary=Vegan&viewAll=dietary" +
  41.                     window.location.search.replace('?', '&') +
  42.                     window.location.hash;
  43.                 window.location.replace(newURL);
  44.             }
  45.     }
  46.  
  47.  
  48. function run() {
  49.   observeDOM(appendUrlParameters);
  50. }
  51.  
  52. setTimeout(run, 1000);
  53.