// ==UserScript==
// @name         Amazon - Show absolute review numbers
// @namespace    graphen
// @version      1.2.5
// @description  Adds the number of reviews to each rating separately
// @license      MIT
// @author       Graphen
// @include      /^https?:\/\/(www|smile)\.amazon\.(cn|in|co\.jp|sg|se|ae|fr|de|pl|it|nl|es|co\.uk|ca|com(\.(mx|au|br|tr|be))?)\/.*(dp|gp\/(product|video)|exec\/obidos\/ASIN|o\/ASIN|product-reviews)\/.*$/
// @grant        none
// @noframes
// @icon         https://www.amazon.com/favicon.ico
// ==/UserScript==
/* jshint esversion: 6 */
// Testpages:
// https://www.amazon.de/s?k=roccat+kone+pure+2017&__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&qid=1556553434&ref=sr_pg_1
// https://www.amazon.de/dp/B078S8YZZ6/
(function(doc) {
'use strict';
var totalReviewCount = doc.querySelector('[data-hook="total-review-count"]').innerText;
var arrPercentages = Array.from(doc.querySelectorAll("#histogramTable .a-text-right > .a-size-base"));
if (totalReviewCount && arrPercentages) {
// Sanitize totalReviewCount
// Remove all non-digits
totalReviewCount = totalReviewCount.replace(/\D/g, '');
// Convert string to integer
totalReviewCount = parseInt(totalReviewCount, 10);
// Check for nonsense (Most reviewed product has ~100000 at the moment)
if (totalReviewCount < 250000) {
for (var e of arrPercentages) {
let percentValue = e.innerText;
// Get rid of percentage sign and convert string to integer
percentValue = parseInt(percentValue, 10);
// Calculate absolute review count
percentValue = Math.round(percentValue * totalReviewCount / 100);
// Cancel if nonsense
if (percentValue > totalReviewCount || percentValue < 0) {
break;
}
// Append calculated value to visible node
var absNum = doc.createTextNode(" (" + percentValue + ")");
e.appendChild(absNum);
}
}
}
// Insert own stylesheet
let reviewStyle = doc.createElement("style");
reviewStyle.innerHTML = "#histogramTable td:last-of-type { text-align: right !important; }";
doc.head.appendChild(reviewStyle);
})(document);