Skip to Content
Greasemonkey Hacks
book

Greasemonkey Hacks

by Mark Pilgrim
November 2005
Intermediate to advanced
496 pages
11h 9m
English
O'Reilly Media, Inc.
Content preview from Greasemonkey Hacks

Hack #90. Translate Any Web Page

Add a form at the top of every web page to translate it into your language.

Google Language Tools offers automated online translation of any web page. It's simple to use; just visit http://translate.google.com, enter the URL of the page, and select the source and target languages.

As is the case with so many web services, it would be even simpler to use if it were integrated with the web pages you visit. This hack adds a form at the top of every web page to hook it into Google's translation service.

The Code

This user script runs on all pages. It contains a hardcoded matrix of all the translations that Google Language Tools can perform automatically. English dominates the lists, as both a source and a target language. The script attempts to autodiscover the page's language by looking for a lang attribute on the <html> element. In XHTML, authors can also specify the language in the xml:lang attribute, but that functionality is left as an exercise for the reader. In theory, authors can also specify the language in the Content-Language HTTP header, but HTTP headers are not accessible to user scripts, so we can't check for that either.

On the bright side, the script does remember your previous choices for source and target languages, using the GM_setValue and GM_getValue functions to store your preferences in the local Firefox preferences registry.

Save the following user script as translatepage.user.js:

 // ==UserScript== // @name Translate Page // @namespace ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

Read now

Unlock full access

More than 5,000 organizations count on O’Reilly

AirBnbBlueOriginElectronic ArtsHomeDepotNasdaqRakutenTata Consultancy Services

QuotationMarkO’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
QuotationMarkI wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
QuotationMarkI’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
QuotationMarkI'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Mark W.
Embedded Software Engineer

You might also like

The Joy of JavaScript

The Joy of JavaScript

Luis Atencio
Ruby by Example

Ruby by Example

Kevin C. Baird
What Successful Project Managers Do

What Successful Project Managers Do

W. Scott Cameron, Jeffrey S. Russell, Edward J. Hoffman, Alexander Laufer
How to Overcome a Power Deficit

How to Overcome a Power Deficit

Cyril Bouquet, Jean-Louis Barsoux

Publisher Resources

ISBN: 0596101651Errata Page