Add links to Keepa and Sakura Checker to the Amazon.co.jp product screen.
// ==UserScript==
// @name Amazon_Keepa_Sakura_Button
// @name:ja Amazonの商品画面に価格履歴とサクラチェックのボタンを追加
// @namespace https://greasyfork.org/users/1324207
// @match https://www.amazon.co.jp/dp/*
// @match https://www.amazon.co.jp/*/dp/*
// @match https://www.amazon.co.jp/gp/product/*
// @match https://www.amazon.co.jp/exec/obidos/ASIN/*
// @match https://www.amazon.co.jp/o/ASIN/*
// @match https://www.amazon.co.jp/gp/aw/d/*
// @version 1.3.2
// @author Lark8037
// @description Add links to Keepa and Sakura Checker to the Amazon.co.jp product screen.
// @description:ja Amazonの商品画面にKeepaとサクラチェッカーへのリンクを追加します。
// @license MIT
// @icon https://www.amazon.co.jp/favicon.ico
// ==/UserScript==
(function () {
'use strict';
const SELECTORS = ['#buyNow', '#add-to-cart-button', '#buybox .a-button-stack', '#add-to-cart-button-ubb', '#buybox-see-all-buying-choices', '#buybox-see-all-buying-choices-announce', '#rcx-subscribe-submit-button-announce', '#dealsAccordionRow', '#outOfStock'];
if (!document.getElementById('checker-style')) {
const s = document.createElement('style');
s.id = 'checker-style';
s.textContent = `.checker a{display:inline-block;border:0;height:4ex;line-height:4ex;margin-bottom:1.2ex;width:100%;text-align:center;color:black;border-radius:10em;text-decoration:none;font-size:1em}.sakura-checker-link{background:deeppink}.sakura-checker-link:hover{background:crimson}.price-history-link{background:deepskyblue}.price-history-link:hover{background:dodgerblue}@media screen and (max-width:768px){.checker a{height:5.5ex;line-height:5.5ex}}`;
document.head.appendChild(s);
}
let lastASIN = '';
const getASIN = () => {
const m = location.pathname.match(/\/([A-Z0-9]{10})(?:[/?]|$)/);
if (m) return m[1];
const p = new URLSearchParams(location.search);
return p.get('asin') || document.querySelector('[name="ASIN"], [name="ASIN.0"]')?.value || '';
};
const insertLinks = () => {
const asin = getASIN();
if (!asin || asin === lastASIN || document.getElementById('checker-links')) return;
lastASIN = asin;
let target;
for (const sel of SELECTORS) {
const el = document.querySelector(sel);
if (el) {
target = el.closest('div.a-section') || el.parentElement;
break;
}
}
if (!target) return;
const c = document.createElement('div');
c.id = 'checker-links';
c.className = 'checker';
for (const [href, text, cls] of [
[`https://keepa.com/#!product/5-${asin}`, '価格履歴', 'price-history-link'],
[`https://sakura-checker.jp/search/${asin}/`, 'サクラチェック', 'sakura-checker-link']
]) {
const a = document.createElement('a');
a.href = href;
a.textContent = text;
a.className = cls;
a.target = '_blank';
a.rel = 'noopener noreferrer';
c.appendChild(a);
}
target.after(c);
};
new MutationObserver(insertLinks).observe(document.body, { childList: true, subtree: true });
insertLinks();
})();