CodeMirror

CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. If a mode has been written for the language you are editing, the code will be coloured, and the editor will optionally help you with indentation.

This is the project page for CodeMirror 2, the currently more actively developed, and recommended version. CodeMirror 1 is still available from here.

Supported modes:

Usage demos:

Getting the code

All of CodeMirror is released under a MIT-style license. To get it, you can download the latest release or the current development snapshot as zip files. To create a custom minified script file, you can use the compression API.

We use git for version control. The main repository can be fetched in this way:

git clone http://marijnhaverbeke.nl/git/codemirror2

CodeMirror can also be found on GitHub at marijnh/CodeMirror2. If you plan to hack on the code and contribute patches, the best way to do it is to create a GitHub fork, and send pull requests.

Documentation

The manual is your first stop for learning how to use this library. It starts with a quick explanation of how to use the editor, and then describes all of the (many) options and methods that CodeMirror exposes.

For those who want to learn more about the code, there is an overview of the internals available. The source code itself is, for the most part, also well commented.

Support and bug reports

There is a Google group (a sort of mailing list/newsgroup thing) for discussion and news related to CodeMirror. Reporting bugs is best done on github. You can also e-mail me directly: Marijn Haverbeke.

Supported browsers

The following browsers are able to run CodeMirror:

Firefox 2 or higher
Chrome, any version
Safari 3 or higher
Internet Explorer 6 or higher
Opera 9 or higher (with some key-handling problems on OS X)

I am not actively testing against every new browser release, and vendors have a habit of introducing bugs all the time, so I am relying on the community to tell me when something breaks. See here for information on how to contact me.

Download the latest release

Make a donation

Paypal
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Releases:

25-07-2011: Version 2.12:

Add a SPARQL mode.
Fix bug with cursor jumping around in an unfocused editor in IE.
Allow key and mouse events to bubble out of the editor. Ignore widget clicks.
Solve cursor flakiness after undo/redo.
Fix block-reindent ignoring the last few lines.
Fix parsing of multi-line attrs in XML mode.
Use innerHTML for HTML-escaping.
Some fixes to indentation in C-like mode.
Shrink horiz scrollbars when long lines removed.
Fix width feedback loop bug that caused the width of an inner DIV to shrink.

04-07-2011: Version 2.11:

Add a Scheme mode.
Add a replace method to search cursors, for cursor-preserving replacements.
Make the C-like mode mode more customizeable.
Update XML mode to spot mismatched tags.
Add getStateAfter API and compareState mode API methods for finer-grained mode magic.
Add a getScrollerElement API method to manipulate the scrolling DIV.
Fix drag-and-drop for Firefox.
Add a C# configuration for the C-like mode.
Add full-screen editing and mode-changing demos.

07-06-2011: Version 2.1:

Add a theme system (demo). Note that this is not backwards-compatible—you'll have to update your styles and modes!

07-06-2011: Version 2.02:

Add a Lua mode.
Fix reverse-searching for a regexp.
Empty lines can no longer break highlighting.
Rework scrolling model (the outer wrapper no longer does the scrolling).
Solve horizontal jittering on long lines.
Add runmode.js.
Immediately re-highlight text when typing.
Fix problem with 'sticking' horizontal scrollbar.

26-05-2011: Version 2.01:

Add a Smalltalk mode.
Add a reStructuredText mode.
Add a Python mode.
Add a PL/SQL mode.
coordsChar now works
Fix a problem where onCursorActivity interfered with onChange.
Fix a number of scrolling and mouse-click-position glitches.
Pass information about the changed lines to onChange.
Support cmd-up/down on OS X.
Add triple-click line selection.
Don't handle shift when changing the selection through the API.
Support "nocursor" mode for readOnly option.
Add an onHighlightComplete option.
Fix the context menu for Firefox.

Older releases...

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