IntelliJ: how to force editor to treat a file as javascript?

I'm creating a Grails app in IntelliJ 10 and have a javascript file that is created dynamically, as a Grails view.

For that reason the javascript file doesn't end in '.js'. It ends in '.gsp' because it's a Groovy Server Page that spits out javascript.

IntelliJ doesn't know it's a javascript file so it doesn't give me code completion or warnings.

I want my code complete and syntax checking! Is there a way to force IntelliJ to 开发者_如何学Pythontreat this specific file as Javascript, WITHOUT messing up the IntelliJ's correct treatment of .gsp files everywhere else?

Thanks!

The above answer is slightly outdated. You can do the same in IntelliJ 14 by doing the following:

1. Go to Preferences (Mac OSX : Cmd + Comma)
2. Under Editor -> File Types
3. In the Recognized File Types Highlight JavaScript files (JavaScript)
4. Under Registered Patterns press the + button
5. Enter your regex pattern (for example: *.js.scala.html) and press OK

Cheers!

You can add additional extensions to the JavaScript in Settings (Preferences on Mac) | File Types.

See also Settings | Template Data Languages where you can configure certain files in the project as templates producing specified language to get proper code completion.