Browser based IDE - Textarea with code completion available?

Question

Recently I discovered it's possible to have syntax-highlighting in a <textarea> using JavaScript.

Are there Open Source libraries which also support auto completion? I'd like to make a simple online editor for HTML/CSS templates.

Preferably, the completion is can be extended, so I can add custom rules.

Answer 1

You should check this wikipedia page on javascript based code editors. It lists the MDK-Editor as one that supports auto-completion for html, css and javascript. You can see a demo here.

Answer 2

CodeMirror has ability to support autocompletion

• JS example: http://codemirror.net/demo/complete.html
• XML example http://codemirror.net/demo/xmlcomplete.html