Amazon Top 20 Scanner

amazon_top_20_scanner.user.js

// ==UserScript==
// @name         Amazon Top 20 Scanner
// @namespace    http://www.paulbaker3.com
// @version      1.0
// @description  Scans Amazon bestseller urls similar to http://www.amazon.com/gp/bestsellers/*
// @author       Paul Baker
// @grant        MIT License
// @require      https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js
// @include      https://www.amazon.com/*
// @include      http://www.amazon.com/*
// ==/UserScript==

var max_price, max_reviews, min_price, min_reviews, nr_700plus_revs, price, prices, rating, ratings, _fn, _fn1, _i, _j, _len, _len1;

console.log("Scanning page for Amazon Top 20 data...");
prices = $(".price").contents();
ratings = $(".crAvgStars").children("a");
max_price = 0;
min_price = 999999999999;
max_reviews = 0;
min_reviews = 999999999999;
nr_700plus_revs = 0;

_fn = function() {
  price = parseFloat(price.data.replace(/\$|,/g, ''));
  if (price > max_price) {
    max_price = price;
  }
  if (price < min_price) {
    return min_price = price;
  }
};
for (_i = 0, _len = prices.length; _i < _len; _i++) {
  price = prices[_i];
  _fn();
}

_fn1 = function() {
  var rt;
  rt = parseFloat(rating.textContent.replace(/\$|,/g, ''));
  if (rt > max_reviews) {
    max_reviews = rt;
  }
  if (rt < min_reviews) {
    min_reviews = rt;
  }
  if (rt > 700) {
    return nr_700plus_revs += 1;
  }
};
for (_j = 0, _len1 = ratings.length; _j < _len1; _j++) {
  rating = ratings[_j];
  _fn1();
}

msg = '';
msg += "Max Price:            " + max_price + '\n\n'
msg += "Min Price:             " + min_price + '\n\n'
msg += "Nr with 700 Reviews:  " + nr_700plus_revs + '\n\n'
msg += "Max Reviews:          " + max_reviews + '\n\n'
msg += "Min Reviews:           " + min_reviews + '\n\n'

if (min_price < 999999999999) {
  alert(msg);
} else {
  console.log("Scan complete. Nothing to report.");
}