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I'm trying Eclipse (with JavaEE and Web Development plugins) as a JavaEE/GoogleAppEngine IDE. In HTML editor if I put a <script ... src="..." /> in <head> I automatically get content assist for JavaScript in the referenced file. I was wondering if it was possible to obtain content assist for other JavaScript files (e.g. jQuery or homebrew js library) inside JavaScript editor.
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imo, Aptana is the best eclipse plugin for js editing. It includes support for many of the major libraries like jQuery, yui, dojo, etc.
Spket, however is also good. Though mostly if you do firefox extension development (getting a little out of date though)
The built in js editor is terrible. it claims there are errors all over the place even when there clearly are not.
For latest Eclipse Kepler Release there is one more option to consider which is VJET JavaScrip IDE. Originally developed in eBay and recently contributed to Eclipse foundation. It is still in incubation phase, but can be installed from nightly update site. Initial functionality is described in 'VJET: JavaScript Toolkit' proposal. It provides content assists in JavaScript editor for various JS libraries like:
through VJET ANVILs Projects imported into workspace.
For Eclipse Juno 4.2 and Aptana Studio 3 and JQuery (jquery-1.7.2.js)
I did get this working and upvoted magjis answer above with a caveat.
Dropping the minified JQuery library as per magjis above into a subfolder of an existing project didn't work for me. It did work for me after creating a new project and using the uncompressed library.
There are dozens of outdated posts on SO and elsewhere that refer to deprecated Aptana dialogs and provide information that isn't pertinent to the current Eclipse version. All I know is that for Eclipse Juno 4.2, Aptana 3 and JQuery 1.7.2, here's what works (for me, at least):
Make sure you have the Aptana plugin installed and are in the Web perspective. That's what the Aptana Studio perspective is called...it would be less confusing if they named it something that had the word 'Aptana' in it.
Make sure your default editor is 'JavaScript Source Editor'. Set this in Window -> Preferences -> General -> Editors -> File Associations and choosing the .js extension in the list. There is more than one option in the list box below. Using any other editor didn't even give me code coloring...this is the only one I could get code assist to work with.
I did this before following magjis's advice above, so I don't know if it was even necessary. But I installed the JQuery ruble as below: http://wiki.appcelerator.org/display/tis/JavaScript+Library+Support#JavaScriptLibrarySupport-jQuery%28
Then, to expound on magjis' answer above: Create a new project and add the uncompressed JQuery library by dropping jquery-1.7.2.js onto the project in the Project Explorer and selecting the Link To File option in the dialog that appeared. I linked to the jquery-1.7.2.js in the /js folder of the project root which is where the library usually goes anyway. Drop jquery1.4.2.sdocml into the project and choose to either copy or link to the file. I copied the file into the root of the project.
If I may make a further comment, in retrospect I wish I had given up on Eclipse two months ago and stuck with Notepad++ or spent the time looking for leaner, faster, more stable PHP/JS/HTML/CSS environment.
For recent Eclipse versions (like my Indigo SR2), two things need to be done to get code assist for jQuery in a GAE project.
Configure the project to be a JavaScript project by: Right click project -> Configure (right above Property) -> Convert to JavaScript Project
Do right as Mr. Butterworth and jQuery autocompletion said, install the JSDT jQuery pluggin and add jQuery to the project's JavaScript Resources
Disclaimer I'm the author of the tern.java.
I suggest you that you install tern.java which extends JSDT to improve JavaScript support (completion, hover, hyperlink, validation) for a lot of modern JavaScript frameworks (jQuery, jQuery UI, jQuery Mobile, YUI, Dojo, Cordova, etc) See the full list of tern modules