Livestyle is a small web server that refreshes the stylesheets on your web sites live as you edit them.
The server then notifies the client to reload specific stylesheets when they are updated on the file system.
The livestyle client also falls back to active polling, which means you can use the client as a standalone script on your normal web server.
Use livestyle to get live feedback while staying in your favorite editor. Effective use cases spotted so far:
- Styling parts of web applications that require several clicks to get to the state you are working on.
- Getting instant feedback from many browsers at the same time, including mobile browsers!
- Testing several media queries at the same time with different devices or browser window sizes.
Livestyle installs an executable script on your system called
To get started quickly just change the directory to where your
document root is and run the
livestyle command. The server will now
listen on port 3000.
Here's the full set of command line options:
The directory to serve static files from. Unless
specified, it defaults to the current working directory. If you want
to serve static files in
--root must be specified
The local hostname or IP-address to listen on. Defaults to
The local post number to listen on. Defaults to
Instructs livestyle to proxy requests for everything but CSS files to
a remote server, as determined by the
Accept request header.
Translate the paths of incoming requests. Think of it as a very
primitive mod_rewrite that only works on request path prefixes. For
example, to translate all requests for
/bar/*, use this
Multiple --map switches are allowed. When used in conjunction with
--proxy, the mappings are applied before proxying the request.
Outputs a bunch of debugging information on both the server and the client.
If set, will use fs.watchFile instead of fs.watch. If you experience problems that the server stops watching a file after the first time you save a file, this method will help.
Only notify clients about a changed file if its
increased. Experimental, only supported when using
Livestyle requires NodeJS and npm to be installed. See this page for installation instructions: https://github.com/joyent/node/wiki/Installation
When the prerequisites are in place, run the following command:
npm install -g livestyle
And you are done.
Currently there are some troubles with updating stylesheets using @import in IE, which you want to avoid anyway http://www.stevesouders.com/blog/2009/04/09/dont-use-import/
Since livestyle watches the css files that are actually served to the browser, livestyle work with any CSS preprocessor that runs on the server out of the box.
If you want live updates you will of course need to enable your preprocessor's option to automatically build a new CSS files for each file update. livestyle will then detect the update in the built file and push it to the client.
There are two CSS preprocessors that run in the browser, which is a bit of a special case:
Prefixfree inserts vendor prefixes for the style properties that need them. It does this runtime in the browser by fetching the stylesheet content through XHR and replace the link tags with a style block with prefixed CSS. Livestyle now supports prefixfree.
Less.js injects preprocessed style into the page by loading .less files and reworking the content to real CSS. Livestyle supports live updates using Less.js by refreshing all less stylesheets on the page.