Tampermonkey: AliExpress: show coupon percentage

coupon-percentage.aliexpress.tamper.js

// ==UserScript==
// @name         AliExpress: show coupon percentage
// @namespace    https://gist.github.com/vogler
// @downloadURL  https://gist.github.com/vogler/2d1bfcd01ad5c248bf0fa38a7cced198/raw/coupon-percentage.aliexpress.tamper.js
// @version      0.1
// @description  Show percentage for each coupon.
// @author       Ralf Vogler
// @match        https://coupon.aliexpress.com/buyer/coupon/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  const f = el => {
    const xs = el.querySelectorAll('.use-coupons-info-price');
    for (const x of xs) {
      const limit = parseFloat(x.querySelector('.use-coupons-info-lang-limit').innerText.match(/\d+\.\d+/));
      const price = parseFloat(x.querySelector('.use-coupons-info-lang-price').innerText.match(/\d+\.\d+/));
      const ratio = (price/limit*100).toFixed(2);
      // console.log(limit, price, ratio);
      if (ratio) x.querySelector('.use-coupons-info-lang-price').appendChild(document.createTextNode(` ${ratio}%`));
    }
  }

  f(document.body); // handle initially loaded items

  // increase font size of minimum order price
  document.querySelectorAll('.use-coupons-info-price').forEach(e => { e.style.fontSize = 'inherit' });

  // handle dynamically loaded items
  // (new MutationObserver((ms, ob) => ms.forEach(m => m.addedNodes.forEach(f)))).observe(document.body, { childList: true, subtree: true });
})();