Adds the number of reviews to each rating separately
// ==UserScript==
// @name Amazon show absolute review numbers
// @namespace graphen
// @version 0.1.0
// @description Adds the number of reviews to each rating separately
// @author Graphen
// @include /^https?:\/\/www\.amazon\.(cn|in|co\.jp|sg|fr|de|it|nl|es|co\.uk|ca|com(\.(mx|au|br))?)\/.*$/
// @icon https://www.amazon.com/favicon.ico
// @grant none
// @noframes
// ==/UserScript==
/* jshint esversion: 6 */
(function() {
'use strict';
var totalReviewCount = document.querySelector(".totalReviewCount").innerText;
// Sanitize totalReviewCount in case site has changed and selector returns nonsense
// Remove all non-digits
totalReviewCount = totalReviewCount.replace(/\D/g, '');
// Convert string to integer
totalReviewCount = parseInt(totalReviewCount, 10);
// Most reviewed product has ~100000 at the moment
if (totalReviewCount < 250000) {
const arrPercentages = Array.from(document.querySelectorAll("#histogramTable .a-text-right > *:first-child"));
for (var e of arrPercentages) {
let v = e.innerText;
// Get rid of percentage sign and convert string to integer
v = parseInt(v, 10);
// Calculate absolute review count
v = Math.round(v * totalReviewCount / 100);
// Cancel if nonsense
if (v > totalReviewCount || v < 0) {
break;
}
// Append calculated value to visible node
e.textContent += " (" + v + ")";
}
}
})();