A very tiny hash-based JavaScript routing system.
JavaScript CoffeeScript Python
Latest commit 8c321d5 Jul 24, 2012 @nlessmann nlessmann Refined wording


Simrou 1.5

A very tiny hash-based JavaScript routing system

Simrou is a small JavaScript framework that allows to bind event handlers that listen to changes of window.location.hash. This is in particular useful when developing single-page web applications, because this technique helps to write maintainable code and enables deep-linking. See the demo code below to get an idea of how this works.

In contrary to other frameworks with similar features, Simrou is intended to be extremly simple to setup and use. It does not provide any other features beside the routing, hence it is very lightweight and flexible.


// Setup an instance of Simrou
var router = new Simrou();

// Register a route that matches edit requests to any article
var editRoute = router.addRoute('/article/:id/edit');

// Bind an action handler to that route
editRoute.get(function(event, params) {

// HTML Forms are getting watched, so you can even bind an
// action handler to POST/PUT/DELETE requests.

// Start the engine!

// Navigate somewhere (updates location.hash and resolves the URL)

// ..or resolve without touching location.hash
router.resolve('/article/18/edit', 'POST');

Links work just as expected if you prepend them with a hash symbol:

<a href="#/article/182/edit">Edit article 182</a>

A typical url within your application will look like this:


Advanced usage

Create custom routers with CoffeeScript

Simrou can easily be used as a basis for your own routing classes that encapsulates the specific routing logic for your application or for parts of it.

class MyRouter extends Simrou
    initialize: ->
        # Add some routes

    getArticle: (event, params) ->
        Model.loadArticle params.id

    postArticle: (event, params) ->
        # ...

router = new MyRouter

Bulk adding of routes

You can add more than one route or action handler at a time:

var router = new Simrou({
    '/article/:id/edit': {
        get: [ actionHandler11, actionHandler12 ],
        post: actionHandler2,
        put: actionHandler3
    '/downloads/*': { get: actionHandler4 },
    '/homepage': actionHandler5

router.start('/homepage');   // Handing over a default route to navigate to


You can use two different types of wildcards in your routes: Parameters and Splats (this is just the same as in Backbone.js).

  • Parameters are introduced by a colon and end at the next slash.
    e.g. "/test/:name" matches "/test/mike" and "/test/joe", but not "/test/joe/something".

  • Splats work the same way, but start with an asterix instead of a colon and are not limited by slashes. They are an optional part of the route.
    e.g. "/test/*sp" matches "/test" (extracting ""), "/test/joe" (extracting "joe") and "/test/joe/something/more" (extracting "joe/something/more").

Parameters and splats can be mixed:

var articleRoute = router.addRoute('/articles/:edit/*action');

Any action handler attached to this route will be called with the following arguments:

function actionHandler(event, parameters, method)
  • event is a jQuery event object.
  • parameters is a plain object {} that contains the values extracted from the route (parameters and splats).
    With the route from above example, parameter has two properties, "edit" and "action".
  • method is a string such as 'get' or 'post', specifing the desired HTTP method.

Case-insensitive routes

By default, all routes are case-sensitive. For a situation where you need to create a case-insensitive route, addRoute() accepts a second parameter:

var route = router.addRoute('/foo', false); // <-- route is now case-insensitive, e.g. '/FOO' is a match.

Assembling routes

The route object provides a nifty helper method to get a concrete url:

var article = router.addRoute('/articles/:id/*action');
var url = article.assemble(17, 'edit'); // returns: /articles/17/edit

// Equivalent syntax:
url = article.assemble({ id: 17, action: 'edit' });

Attaching event handlers via jQuery events

Action handlers can be attached via jQuery events instead of using Simrou's attachAction() method or the shortcuts get(), post(), put(), delete() and any():

var route = router.addRoute('some/route');

// This..
$(route).on('simrou:get', eventHandler);

// ..equals:

Event handlers for "any" HTTP method

If you want to catch a route regardless which HTTP method was intended, you can do that as well:

route.any(function() {
    // ..do stuff..

Note that it is possible to bind multiple event handlers to a route, e.g.:

var route = router.addRoute('some/route');


router.resolve('some/route', 'get'); // all three event handlers get notified!

Requirements & License

Simrou requires jQuery 1.7 or newer and is released under the MIT license.

Internally, Simrou binds itself to the onHashChange event. If you want to include a fallback for older browser or the IE 7, Simrou works out of the box with Ben Alman's excellent HashChange Plugin for jQuery. No setup required.