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Add Keepa Links

Amazon商品ページにKeepaの価格履歴のリンクを追加

  1. // ==UserScript==
  2. // @name         Add Keepa Links
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1.1
  5. // @description  Amazon商品ページにKeepaの価格履歴のリンクを追加
  6. // @author       himuro_majika
  7. // @match        https://www.amazon.co.jp/*dp/*
  8. // @match        https://www.amazon.co.jp/*gp/*
  9. // @icon         https://www.google.com/s2/favicons?domain=keepa.com
  10. // @grant        none
  11. // ==/UserScript==
  12.  
  13. (function() {
  14.   'use strict';
  15.  
  16.   init();
  17.   function init() {
  18.     insertButton();
  19.   }
  20.   function getProduct() {
  21.     const url = location.href;
  22.     const patternList = [
  23.       /dp\/([^/?]+)/,
  24.       /\/gp\/product\/([^/?]+)/
  25.     ];
  26.     let product = null;
  27.     patternList.forEach(pattern => {
  28.       const match = url.match(pattern);
  29.       if (match) {
  30.         product = match[1];
  31.         return;
  32.       }
  33.     });
  34.     return product;
  35.   }
  36.   function getTargetElement() {
  37.       return document.getElementById("buybox");
  38.   }
  39.   function createKeepaLinkButton() {
  40.     const button = document.createElement("div");
  41.     const a = document.createElement("a");
  42.     const keepaUrl = "https://keepa.com/#!search/5-";
  43.     a.setAttribute("target", "_blank");
  44.     a.innerText = "📉Keepaで価格を確認する.";
  45.     a.addEventListener("click", (e) => {
  46.       e.target.setAttribute("href", keepaUrl + getProduct());
  47.     })
  48.     button.appendChild(a);
  49.     return button;
  50.   }
  51.   function insertButton() {
  52.     const tEle = getTargetElement();
  53.     tEle.parentNode.parentNode.appendChild(createKeepaLinkButton());
  54.   }
  55. })();