user.js

amazon_reviewmeta.user.js

// ==UserScript==
// @name         ReviewMeta Amazon Search
// @namespace    http://tampermonkey.net/
// @version      0.1.2
// @description  Modify star ratings on Amazon pages based on ReviewMeta scores
// @author       bhughes339
// @include      https://*.amazon.tld/*
// @grant        none
// @require      http://code.jquery.com/jquery-latest.js
// ==/UserScript==

/* Color legend:
   Green - Pass (good)
   Orange - Warn (iffy)
   Red - Fail (bad)
   Grey - Not yet analyzed by ReviewMeta */

(function() {
    'use strict';
    function modStars(asin, ele) {
        $.getJSON('https://reviewmeta.com/api/amazon/' + asin, function(data) {
            switch (data.s_overall) {
                case "1":
                    ele.attr('style', 'filter:hue-rotate(40deg)');
                    break;
                case "2":
                    ele.attr('style', 'filter:hue-rotate(340deg)');
                    break;
                case "3":
                    ele.attr('style', 'filter:hue-rotate(315deg) saturate(500%)');
                    break;
                default:
                    ele.attr('style', 'filter:grayscale(100%)');
                    ele.attr('onclick', "window.open('" + data.href + "');");
                    break;
            }
        });
    }
    var url = window.location.href;
    var asinMatch = url.match(/\/(B[\dA-Z]{9}|\d{9}(?:X|\d))/); // https://stackoverflow.com/questions/2123131/determine-if-10-digit-string-is-valid-amazon-asin
    var srch = (asinMatch) ? 'span#acrPopover' : 'span[name]';
    $(srch).each(function(index) {
        var asin = (asinMatch) ? asinMatch[1] : $(this).attr('name');
        var $self = $(this);
        modStars(asin, $self);
    });
})();