GreaseMonkey script to check Kindle prices in this forum

[kakapo]

I have written a script for GreaseMonkey (a FireFox addon) to check the prices of Kindle ebooks linked in MobileRead forum posts. Once installed, any links to a Kindle ebook will have the price displayed after then. Prices are coloured red for free and blue otherwise.

Currently the script only works in FireFox with GreaseMonkey installed. Even though Google Chrome can use some GreaseMonkey scripts, it can't use this one. I should be able to make it work as a proper Chrome extension, just ask and i will.

The script is set up to check amazon.com links. It can check amazon.co.uk links, just change the appropriate line at the top. Adding of additional Amazon countries should be easy enough. It should even be possible to add other ebook stores, eg Kobo or B&N.

To install the script, go to http://userscripts.org/scripts/show/138544 or copy out the code below.

// ==UserScript==
// @name        MobileRead Kindle Price Check
// @namespace   kakapo.public
// @description Checks price of Kindle ebook links in MobileRead forum posts
// @include     https://www.mobileread.com/forums/showthread.php*
// @version     1
// ==/UserScript==

// change com in line below to co.uk for Amazon UK
var site_regex = /^(http|https):\/\/(www\.)?amazon\.(com)(\/.*)/;

var ebook_url_regexs = [
  /^\/dp\//,
  /^\/[^\/]+\/dp\//,
  /^\/gp\/product\//
];

var check_price = function(element, url) {
  var xhr = GM_xmlhttpRequest({
    method: 'GET',
    url: url,
    onload: function(response) {
      var data = response.responseText;
      var pos0 = data.indexOf('class="priceLarge"');
      var pos1 = data.indexOf('>', pos0);
      var pos2 = data.indexOf('<', pos1);
      var price = data.substring(pos1 + 1, pos2).trim();
      if (price == '') {
        price = 'N/A';
      }
      var color = price == 'Free' || price == '$0.00' || price == '£0.00' ? 'red' : 'blue';
      element.insertAdjacentHTML('afterend', ' <span style="color:'+color+'">('+price+')</span>');
    }
  });
}

var a = document.getElementsByTagName('a');
for (var i = 0; i < a.length; i++) {
  var url = a[i].href;
  var parts = site_regex.exec(url);
  if (parts) {
    for (var j = 0; j < ebook_url_regexs.length; j++)  {
      if (ebook_url_regexs[j].test(parts[parts.length-1])) {
        check_price(a[i], url);
      }
    }
  }
}

[copyrite]

Pretty cool! Thanks!

[sherman]

And still no one knows just WHAT is going on over at Amazon...

This thread on the Amazon discussion boards has quite a number of very confused international Amazon customers.

Us folks from NZ seem to be especially affected. I haven't been able to obtain ANY of the advertised freebies from Amazon for at least a week now

[Joseph R]

Thank you for the good work, kakapo!

Tampermonkey is Chrome's equivalent to greasemonkey.

All you need to do is go to ''add a new script', and Copy and Paste Kakapo's script and you are good to go!

[kyteflyer]

Wonder why its not working here... script installed OK...

[JSWolf]

Anyway want to come up with scripts for Sony, B&N, & Kobo please?

[kyteflyer]

Script is working on the computer, just love it. Thanks

[kyteflyer]

I've given up on Firefox because it has turned into a giant slug... So mostly using Chrome, Opera and Safari.

Sadly, Greasekit for Safari does not any longer seem to be maintained, and the old script isn't compatible with newer versions of Safari... perhaps someone will do something about it.

On Chrome, its Tampermonkey, and in Opera, its Violentmonkey. This script works beautifully in both of those.

[Shack70]

Working fine here (Firefox + Amazon US Store)! Thanks!

[kakapo]

Originally Posted by kyteflyer

Sadly, Greasekit for Safari does not any longer seem to be maintained, and the old script isn't compatible with newer versions of Safari... perhaps someone will do something about it.

Try NinjaKit as a replacement for Greasekit. It works for me on Safari 5.1.7 (still on 10.6 here, so can't get Safari 6).

While i'm here, any suggestions for new features for the Kindle Price Check script? Proper UK/DE/etc versions? Automatic .com to .co.uk link conversion? BN/Kobo/Sony support?

[carld]

This is terrific. Thank you. And yes, Tapermonkey + Script works just fine with Chrome.

Edit: I was surprised, but it also shows prices for linked Android Apps as well.

[kyteflyer]

Originally Posted by kakapo

Try NinjaKit as a replacement for Greasekit. It works for me on Safari 5.1.7 (still on 10.6 here, so can't get Safari 6).

Thanks for that.. I'll give it a try (on 10.8.3 beta and latest safari so should be interesting... will report back)

[edit] WORKING!! Yay! Hope it works for my other scripts for other sites too

[sadievan]

Thanks Kakapo. Karma going to you.

[DustyDisks]

Thanks Kakapo,

This is almost as good as "crispy" bacon!

[darthyoda6]

Thanks, it's working great with Greasemonkey, although I had to add

// @grant       GM_xmlhttpRequest

at the top to get rid of the message that kept poping up about the script needing to grant permission. Is there a way to get the script to use the amazon.com links but check the price against amazon.ca? Or do I just need to change the (com) to (ca).

Thanks