There are 2 previous versions of this script.
/*
GreaseMonkey userscript for showing prices in your local currency.
Customize to your own currency below.
Exchange rates provided by Yahoo @ www.yahoo.com
New to GreaseMonkey? Visit <http://www.greasespot.net/>
2005-04-17 Carl Henrik Lunde chlunde+greasemonkey <at> ping.uio.no
http://www.ping.uio.no/~chlunde/stuff
Maintainer:
Ori Avtalion ori <at> avtalion.name
Contributors:
Simon Pope skjpope -> gmail.com
Changelog:
2005-09-14
* Added GM menu options to change the local currency coin and
symbol.
* Added price rounding.
* Added option to toggle whether or not to display the
local currency symbol.
* Fixed double printing of converted currency
2005-10-08
* Fixed occasions where the price would show up several times
* Prices are now converted even when they're part of a large sentence,
such as in the check-out process ("total price is $42.13")
2006-02-25
* Added handling for prices that are not the first element in a tag,
such as in amazon UK's wish list: <span><b>Price:</b>$13.37</span>
2008-03-14
* The converted price now appears right next to the original price.
* All of the prices in a piece of text are converted, instead of just the first one.
2008-15-12
* Added support for Amazon.ca
* The regex now matches 0 or more spaces after the currency symbol. Useful for amazon.ca
(I could just add the single space to the canadian dollar currency regex pattern, but
other websites might behave differently).
2009-05-02
* Added support for Amazon.de (Euros).
* Refactored a bit to allow for different price parsers.
TODO:
* Add GM menu options to change source currency
* Add option and GUI to choose whether the local currency symbol
should be prefixed or suffixed to the currency
* Figure out the local currency automatically, so one would be able to use this script
on every website, even if it's using GBP on a .com domain
*/
// ==UserScript==
// @name Amazon Local Currency - Dynamic version
// @namespace http://userscripts.org/scripts/show/1476
// @description Show prices in you local currency
// @include http://www.amazon.com/*
// @include https://www.amazon.com/*
// @include http://amazon.com/*
// @include https://amazon.com/*
// @include http://www.amazon.co.uk/*
// @include https://www.amazon.co.uk/*
// @include http://amazon.co.uk/*
// @include https://amazon.co.uk/*
// @include http://www.amazon.ca/*
// @include https://www.amazon.ca/*
// @include http://amazon.ca/*
// @include https://amazon.ca/*
// @include http://www.amazon.de/*
// @include https://www.amazon.de/*
// @include http://amazon.de/*
// @include https://amazon.de/*
// ==/UserScript==
(function() {
// Helper function. From the Prototype Javascript Framework:
String.prototype.endsWith = function (pattern) {
var d = this.length - pattern.length;
return d >= 0 && this.lastIndexOf(pattern) === d;
};
var amazonCurrencies = ["USD", "GBP", "CAD"];
var currencyFrom;
// Decimal separator: .
// Thousands separator: ,
function regularPriceParser(price, currency) {
return parseFloat(price.replace(/,/g, ""));
}
// Decimal separator: ,
// Thousands separator: .
function europeanPriceParser(price, currency) {
function replacer(character) {
var translate = {".":"", ",":"."};
return translate[character];
}
return regularPriceParser(price.replace(/[,.]/g, replacer), currency);
}
// priceRegex explanation:
// Match a string that begins with the symbol, and then
// has 0 or more spaces, digits, commas and periods, ending with a digit.
// The actual numeric price portion MUST BE enclosed in parentheses.
var currencies = {
"USD" : {
symbol: "$",
priceRegex: /\$\s*([\d,.]+\d)/,
parser: regularPriceParser
},
"GBP" : {
symbol: "£",
priceRegex: /£\s*([\d,.]+\d)/,
parser: regularPriceParser
},
"CAD" : {
symbol: "CDN$",
priceRegex: /CDN\$\s*([\d,.]+\d)/,
parser: regularPriceParser
},
"EUR" : {
symbol: "EUR",
priceRegex: /EUR\s*([\d,.]+\d)/,
parser: europeanPriceParser
}
};
// Check which Amazon we're at:
// amazon.com
if (document.domain.endsWith("com")) {
currencyFrom = "USD";
// amazon.co.uk
} else if (document.domain.endsWith("co.uk")) {
currencyFrom = "GBP";
// amazon.ca
} else if (document.domain.endsWith("ca")) {
currencyFrom = "CAD";
// amazon.de
} else if (document.domain.endsWith("de")) {
currencyFrom = "EUR";
} else {
return;
}
// Configuration keys (not all of them)
var LAST_RUN = "last_run_";
var CURRENCY_RATE = "currency_rate_";
// Customize to fit:
// (Some options are modifiable from the GUI)
var currencyToDefault = "ILS";
var currencyToSymbolDefault = "NIS ";
var decimalPlaces = 2;
var prefixCurrencySymbol = true;
// Only traverse these elements
var elnames = ["td", "font", "b", "span", "strong", "div"];
var rounding = Math.pow(10, decimalPlaces);
// Check last run time
var rate = GM_getValue(CURRENCY_RATE + currencyFrom);
var lastRun = GM_getValue(LAST_RUN + currencyFrom, "01/01/0001");
var currencyTo = GM_getValue("currency_to", currencyToDefault);
var todayDate = new Date();
var todayString = todayDate.getDate() + "/" + todayDate.getMonth() + "/" + todayDate.getFullYear();
var currencyToSymbol = GM_getValue("currency_symbol", currencyToSymbolDefault);
// Function definitions
function fetchCurrencyData(coin, callback) {
GM_xmlhttpRequest({
method: "GET",
url: "http://download.finance.yahoo.com/d/quotes.csv?s=" + coin + currencyTo + "=X&f=l1&e=.csv",
onload: function(responseDetails) {
var rate = responseDetails.responseText.replace(/[\r\n]/g, "");
GM_setValue(CURRENCY_RATE + coin, rate);
GM_setValue(LAST_RUN + coin, todayString);
callback();
},
onerror: function(responseDetails) {
alert("Error fetching currency data for " + coin);
}
});
}
// Receives a price, and converts it. Returns "<original price> (<converted price>)"
function appendConversion(price, matched) {
var originalPrice = currencies[currencyFrom].parser(matched, currencyFrom);
if (isNaN(originalPrice)) {
return price;
}
var converted = formatCurrency(originalPrice * rate, rounding,
currencyToSymbol, prefixCurrencySymbol);
return price + " (" + converted + ")";
}
function formatCurrency(num, rounding, symbol, prefix) {
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*rounding + 0.50000000001);
cents = num % rounding;
num = Math.floor(num / rounding).toString();
if (cents < 10) {
cents = "0" + cents;
}
for (var i = 0; i < Math.floor((num.length - (1 + i)) / 3); i++) {
num = num.substring(0, num.length - (4 * i + 3)) + ',' +
num.substring(num.length-(4*i+3));
}
if (prefix) {
return (symbol + ((sign)?'':'-') + num + '.' + cents);
} else {
return (((sign)?'':'-') + num + '.' + cents + symbol);
}
}
// Convert desired currency
function convertCurrency() {
// Match a string that begins with the symbol, and then
// has 0 or more spaces, digits, commas and periods, ending with a digit
var currency = currencies[currencyFrom];
var i,j,k;
for (i = 0; i < elnames.length; ++i) {
var elems = document.getElementsByTagName(elnames[i]);
for (j = 0; j < elems.length; ++j) {
var price = elems[j];
for (k = 0; k < price.childNodes.length; ++k) {
var currNode = price.childNodes[k];
// Only modify text nodes
if (currNode.nodeType == 3) {
// Quick check before using the regex
if (currNode.nodeValue.indexOf(currency.symbol) != -1) {
// nbsp replacement done to fix some amazon.de prices (e.g. "EUR 1,23")
GM_log(currNode.nodeValue.replace(/ /, " "));
currNode.nodeValue = currNode.nodeValue.replace(/ /, " ").replace(currency.priceRegex, appendConversion);
}
}
}
}
}
}
function setLocalCurrency() {
var newCurrencyTo = prompt("Enter the code for your local currency (e.g. AUD, USD, ILS, etc.)", "");
if (newCurrencyTo === "" || newCurrencyTo === null) {
alert("Currency code is invalid. Please enter again");
return;
}
// GM_log("Currency changed from " + currencyTo + " to " + newCurrencyTo);
GM_setValue("currency_to", newCurrencyTo);
currencyTo = newCurrencyTo;
// Reset the various conversion rates
for (var i = 0; i < amazonCurrencies.length; ++i) {
GM_setValue(LAST_RUN + amazonCurrencies[i], "01/01/0001");
}
// Not really.. at this point, the fetching isn't done yet
alert("Success! Refresh page to see the changes.");
}
function setLocalCurrencySymbol() {
var newSymbol = prompt("Enter the symbol for your local currency ( e.g. A$, $, ¥, £, etc.)", "");
if (newSymbol === '' || newSymbol === null) {
alert("Symbol is invalid. Please enter again");
return;
}
alert("Success! Refresh page to see the changes.");
// GM_log("Currency Symbol changed from " + currencyToSymbol + " to " + newSymbol);
GM_setValue("currency_symbol", newSymbol);
currencyToSymbol = newSymbol;
}
GM_registerMenuCommand("Change Local Currency (" + currencyTo + ")", setLocalCurrency);
GM_registerMenuCommand("Change Local Currency Symbol (" + currencyToSymbol + ")", setLocalCurrencySymbol);
if (rate === undefined || todayString !== lastRun) {
// GM_log("Currency data is out-dated. Fetching new information...");
fetchCurrencyData(currencyFrom, function() {
rate = GM_getValue(CURRENCY_RATE + currencyFrom);
convertCurrency();
});
} else {
convertCurrency();
}
})();
