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Make your Backbone.js apps dance with a composite application architecture!

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readme.md

Make your Backbone.js apps dance with a composite application architecture!

Backbone.Marionette

Backbone.Marionette is a composite application libarary for Backbone.js that aims to simplify the construction of large scale JavaScript application through common design and implementation patterns found in composite application architectures, such as Microsoft's "Prism" framework.

Unlike other composite application frameworks, Backbone.Marionette is designed to be a lightweigt and flexible library of tools that you can use when you want to. Like Backbone.js itself, you're not required to use all of Backbone.Marionette just because you want to use some of it.

Download And Annotated Source Code

You can download the raw source code above. For the development version, grab "backbone.marionette.js". For the production version, grab "backbone.marionette.min.js".

For a good time, call.. err... read through the annotated source code.

Marionette's Pieces

There are only a few pieces to the marionette at this point:

  • Backbone.Marionette.Application: An application object that starts your app via initializers, and more
  • Backbone.Marionette.ItemView: A view that renders a single item
  • Backbone.Marionette.CollectionView: A view that iterates over a collection, and renders individual ItemView instances for each model
  • Backbone.Marionette.RegionManager: Manage visual regions of your application, including display and removal of content
  • Backbone.Marionette.BindTo: An event binding manager, to facilitate binding and unbinding of events
  • Backbone.Marionette.TemplateManager: Cache templates that are stored in <script> blocks, for faster subsequent access
  • Application.vent: Every instance of Application comes with a .vent property, an event aggregator

The Application, RegionManager, ItemView and CollectionView use the extend syntax and functionality from Backbone, allowing you to define new versions of these objects with custom behavior.

Marionette.Application

The Backbone.Marionette.Application object is the hub of your composite application. It organizes, initializes and coordinate the various pieces of your app. It also provides a starting point for you to call into, from your HTML script block or from your JavaScript files directly if you prefer to go that route.

The Application is meant to be instantiate directly, although you can extend it to add your own functionality.

MyApp = new Backbone.Marionette.Application();

Adding Initializers

Your application needs to do useful things, like displaying content in your regions, starting up your routers, and more. To accomplish these tasks and ensure that your Application is fully configured, you can add initializer callbacks to the application.

MyApp.addInitializer(function(options){
  // do useful stuff here
  var myView = new MyView({
    model: options.someModel
  });
  MyApp.mainRegion.show(myView);
});

MyApp.addInitializer(function(options){
  new MyAppRouter();
  Backbone.history.start();
});

These callbacks will be executed when you start your application. The options parameters is passed through the start method (see below).

Application Events

The Application object raises a few events during its lifecycle. These events can be used to do additional processing of your application. For example, you may want to pre-process some data just before initialization happens. Or you may want to wait until your entire application is initialized to start the Backbone.history.

The two events that are currently triggered, are:

  • "initialize:before": fired just before the initializers kick off
  • "initialize:after": fires just after the initializers have finished
MyApp.bind("initialize:before", function(options){
  options.moreData = "Yo dawg, I heard you like options so I put some options in your options!"
});

MyApp.bind("initialize:after", function(options){
  if (Backbone.history){
    Backbone.history.start();
  }
});

The options parameter is passed through the start method of the application object (see below).

Starting An Application

Once you have your application configured, you can kick everything off by calling: MyApp.start(options).

This function takes a single optional parameter. This parameter will be passed to each of your initializer functions, as well as the initialize events. This allows you to provide extra configuration for various parts of your app, at initialization/start of the app, instead of just at definition.

var options = {
  something: "some value",
  another: "#some-selector"
};

MyApp.start(options);

Event Aggregator

An event aggregator is an application level pub/sub mechanism that allows various pieces of an otherwise segmented and disconnected system to communicate with each other. Backbone.Marionette provides an event aggregator with each application instance: MyApp.vent.

You can use this event aggregator to communicate between various modules of your application, ensuring correct decoupling while also facilitating functionality that needs more than one of your application's modules.

(function(MyApp){

  MyApp.vent.bind("some:event", function(){
    alert("Some event was fired!!!!");
  });

})(MyApp);

MyApp.vent.trigger("some:event");

For a more detailed discussion and example of using an event aggregator with Backbone applications, see the blog post: References, Routing, and The Event Aggregator: Coordinating Views In Backbone.js

Marionette.RegionManager

Regions can be added to the application by calling the addRegions method on your application instance. This method expects a single hash parameter, with named regions and either jQuery selectors or RegionManager objects. You may call this method as many times as you like, and it will continue adding regions to the app. If you specify the same name twice, last one in wins.

MyApp.addRegions({
  mainRegion: "#main-content",
  navigationRegion: "#navigation"
});

var FooterRegion = Backbone.Marionette.RegionManager.extend({
  el: "#footer"
});

MyApp.addRegions({footerRegion: FooterRegion});

Note that if you define your own RegionManager object, you must provide an el for it. If you don't, you will receive an runtime exception saying that an el is required.

Additionally, when you pass a RegionManager directly into to the addRegions method, you must specify the constructor function for your region manager, not an instance of it.

Marionette.ItemView

An ItemView is a view that represents a single item. That item may be a Backbone.Model or may be a Backbone.Collection. Whichever it is, though, it will be treated as a single item.

ItemView render

An item view has a render method built in to it. By default it uses underscore.js templates.

The default implementation will use a template that you specify (see below) and serialize the model or collection for you (see below).

You can provide a custom implementation of a method called renderTemplate to change template engines. For example, if you want to use jQuery templates, you can do this:

Backbone.Marionette.ItemView.extend({
  renderTemplate: function(template, data){
    return template.tmpl(data);
  }
});

The template parameter is a jQuery object with the contents of the template that was specified in the view (see below).

The data parameter is the serialized data for either the model or the collection of the view (see below).

After the view has been rendered, a onRender method will be called. You can implement this in your view to provide custom code for dealing with the view's el after it has been rendered:

Backbone.Marionette.ItemView.extend({
  onRender: function(){
    // manipulate the `el` here. it's already
    // been rendered, and is full of the view's
    // HTML, ready to go.
  }
});

ItemView template

Item views should be configured with a template. The template attribute should be either a valid jQuery selector, or a function that returns a valid jQuery selector:

MyView = Backbone.Marionette.ItemView.extend({
  template: "#some-template"
});

AnotherView = Backbone.Marionette.ItemView.extend({
  template: function(){
    return $("#some-template")
  }
});

new SomeItemView({
  template: "#some-template"
});

ItemView serializeData

Item views will serialize a model or collection, by default, by calling .toJSON on either the model or collection. If both a model and collection are attached to an item view, the model will be used as the data source. The results of the data serialization will be passed to the template that is rendered.

If the serialization is a model, the results are passed in directly:

var myModel = new MyModel({foo: "bar"});

new MyItemView({
  template: "#myItemTemplate",
  model: myModel
});

MyItemView.render();
<script id="myItemTemplate" type="template">
  Foo is: <%= foo %>
</script>

If the serialization is a collection, the results are passed in as an items array:

var myCollection = new MyCollection([{foo: "bar"}, {foo: "baz"}]);

new MyItemView({
  template: "#myCollectionTemplate",
  collection: myCollection
});

MyItemView.render();
<script id="myCollectionTemplate" type="template">
  <% _.each(items, function(item){ %>
    Foo is: <%= foo %>
  <% }); %>
</script>

If you need custom serialization for your data, you can provide a serializeData method on your view. It must return a valid JSON object, as if you had called .toJSON on a model or collection.

Backbone.Marionette.ItemView.extend({
  serializeData: function(){
    return {
      "some attribute": "some value"
    }
  }
});

ItemView events

ItemView extends Marionette.BindTo. It is recommended that you use the bindTo method to bind model and collection events.

MyView = Backbone.Marionette.ItemView.extend({
  initialize: function(){
    this.bindTo(this.model, "change:foo", this.modelChanged);
    this.bindTo(this.collection, "add", this.modelAdded);
  },

  modelChanged: function(model, value){
  },

  modelAdded: function(model){
  }
});

The context (this) will automatically be set to the view. You can optionally set the context by passing in the context object as the 4th parameter of bindTo.

ItemView close

ItemView implements a close method, which is called by the region managers automatically. As part of the implementation, the following are performed:

  • unbind all bindTo events
  • unbind all custom view events
  • unbind all DOM events
  • remove this.el from teh DOM
  • call an onClose event on the view, if one is provided

By providing an onClose event in your view definition, you can run custom code for your view that is fired after your view has been closed and cleaned up. This lets you handle any additional clean up code without having to override the close method.

Backbone.Marionette.ItemView.extend({
  onClose: function(){
    // custom cleanup or closing code, here
  }
});

Marionette.CollectionView

The CollectionView will loop through all of the models in the specified collection, render each of them using a specified itemView, then append the results of the item view's el to the collection view's el.

CollectionView's itemView

Specify an itemView in your collection view definition. This must be a Backbone view object definition (not instance). It can be any Backbone.View or be derived from Marionette.ItemView.

MyItemView = Backbone.Marionette.ItemView.extend({});

Backbone.Marionette.CollectionView.extend({
  itemView: MyItemView
});

CollectionView: Add / Remove Items

The collection view binds to the "add" and "remove" events of the collection that is specified. It will render any model that is added to the collection and add to the DOM automatically. It will also close any view for a model that is removed from the collection.

CollectionView's appendHtml

By default the collection view will call jQuery's .append to move the HTML contents from the item view instance in to the collection view's el.

You can override this by specifying an appendHtml method in your view definition. This method takes two parameters and has no return value.

Parameter el: the collection view's el, as a jQuery selector object.

Parameter html: the HTML contents that were generated by the item view.

Backbone.Marionette.CollectionView.extend({
  appendHtml: function(el, html){
    el.prepend(html);
  }
});

CollectionView close

CollectionView implements a close method, which is called by the region managers automatically. As part of the implementation, the following are performed:

  • unbind all bindTo events
  • unbind all custom view events
  • unbind all DOM events
  • unbind all item views that were rendered
  • remove this.el from teh DOM
  • call an onClose event on the view, if one is provided

By providing an onClose event in your view definition, you can run custom code for your view that is fired after your view has been closed and cleaned up. This lets you handle any additional clean up code without having to override the close method.

Backbone.Marionette.CollectionView.extend({
  onClose: function(){
    // custom cleanup or closing code, here
  }
});

Marionette.BindTo

The BindTo object provides event binding management and facilitates simple event binding and unbinding for any object that extends from Backbone.Events.

Bind an event:

var binder = _.extend({}, Backbone.Marionette.BindTo);

var model = new MyModel();

var handler = {
  doIt: function(){}
}
binder.bindTo(model, "change:foo", handler.doIt);

You can optionally specify a 4th parameter as the context in which the callback method for the event will be executed:

binder.bindTo(model, "change:foo", someCallback, someContext);

You can call unbindAll to unbind all events that were bound with the bindTo method:

binder.unbindAll();

Backbone.Marionette.TemplateManager

The TemplateManager provides a cache for retrieving templates from script blocks in your HTML. This will improve the speed of subsequent calls to get a template.

Basic Usage

To use the TemplateManager, call it directly. It is not instantiated like other Marionette objects.

Get A Template

Templates are retrieved by jQuery selector, by default:

Backbone.Marionette.TemplateManager.get("#my-template");

Making multiple calls to get the same template will retrieve the template from the cache on subsequence calls:

Backbone.Marionette.TemplateManager.get("#my-template");
Backbone.Marionette.TemplateManager.get("#my-template");
Backbone.Marionette.TemplateManager.get("#my-template");

Override Template Retrieval

The default template retrieval is to select the template contents from the DOM using jQuery. If you wish to change the way this works, you can override the loadTemplate method on the TemplateManager object.

For example, if you want to load templates asychronously from the server, instead of from the DOM, you could replace loadTemplate with a function like this:

Backbone.Marionette.TemplateManager.loadTemplate = function(templateId){
  var that = this;
  $.get(templateId + ".html", function(template){
    // store the template in the cache.
    that.templates[templateId] = template;
  });
}

This will use jQuery to asynchronously retrieve the template from the server, and then store the retrieved template in the template manager's cache (be sure to use the templateId parameter as the key for the cache).

Clear Items From cache

You can clear one or more, or all items from the cache using the clear method. Clearing a template from the cache will force it to re-load from the DOM (or from the overriden loadTemplate function) the next time it is retrieved.

If you do not specify any parameters, all items will be cleared from the cache:

Backbone.Marionette.TemplateManager.get("#my-template");
Backbone.Marionette.TemplateManager.get("#this-template");
Backbone.Marionette.TemplateManager.get("#that-template");

// clear all templates from the cache
Backbone.Marionette.TemplateManager.clear()

If you specify one or more parameters, these parameters are assumed to be the templateId used for loading / caching:

Backbone.Marionette.TemplateManager.get("#my-template");
Backbone.Marionette.TemplateManager.get("#this-template");
Backbone.Marionette.TemplateManager.get("#that-template");

// clear 2 of 3 templates from the cache
Backbone.Marionette.TemplateManager.clear("#my-template", "#this-template")

Built In To ItemView

If you're using Marionette.ItemView, you don't need to manually call the TemplateManager. Just specify the template attribute of your view as a jQuery selector, and the ItemView will use the template manager by default.

Backbone.Marionette Example Apps

There are several sample apps available.

BBCloneMail

I'm building a medium sized app to demonstrate Backbone.Marionette. It's a simple clone of a GMail like interface, with email and contact management. There is no back end for data, currently. The sample app does run on top of Ruby and Sinatra, but all the data is hard coded into the HTML/JavaScript right now.

You can find BBCloneMail online at:

http://bbclonemail.heroku.com

And you can find the source code at:

http://github.com/derickbailey/bbclonemail

Steve Gentile' Contact Manager

Steve Gentile is building two versions of the same contact manager app. One of them runs on NodeJS as a back-end, and the other runs on ASP.NET MVC as the back-end.

The NodeJS version is here:

https://github.com/sgentile/BackboneNodeContacts

And the ASP.NET MVC version is here:

https://github.com/sgentile/BackboneContacts

Quick & Dirty Sample

Here's a quick and dirty example to show how to use some of the pieces of Marionette:

// define the application
// options we pass in are copied on to the instance
MyApp = new Backbone.Marionette.Application({
  someOption: "some value";
});

// add a region to the app
myRegion = Backbone.Marionette.RegionManager.extend({
  el: "#my-region"
});
MyApp.addRegions({ myRegion: MyRegion });

// define some functionality for the app
(function(MyApp, Backbone){

  // a view to render into the region
  var SomeView = Backbone.View.extend({
    render: function(){

      // get "someOption" from the app, since we
      // passed it into the app initializer, above
      $(this.el).html(MyApp.someOption);
    },

    doSomething: function(){
      // the applicaiton has an event aggregator on instantiation
      // call out to the event aggregator to raise an event
      MyApp.vent.trigger("something:happened");
    }
  });

  // an initializer to run this functional area 
  // when the app starts up
  MyApp.addInitializer(function(){
    var someView = new SomeView();
    MyApp.myRegion.show(someView);
    someView.doSomething();
  });

})(MyApp, Backbone);

// calling start will run all of the initializers
// this can be done from your JS file directly, or
// from a script block in your HTML
$(function(){
  MyApp.start();
});

Requirements

Backbone.Marionette is built and tested with the following libraries:

  • Underscore.js v1.2.3
  • Backbone.js v0.5.3
  • jQuery v1.7.1

You may not need to be up to date with these exact versions. However, there is no guarantee that the code will work correctly if you are not.

Test Suite Requirements

Backbone.Marionette is also tested with the Jasmine JavaScript test utility, using the Jasmine Ruby gem.

To get the test suite up and running, you need a Ruby installation with the latest RubyGems. Install the 'bundler' gem and then run 'bunle install' from the project's root folder. Then run rake jasmine to run the test suite, and load up http://localhost:8888 to see the test suite in action.

Annotated Source Code Generation

I'm using Docco to generate the annotated source code.

Release Notes

v0.2.3

  • Fixed global variable leaks
  • Removed declared, but unused variables

v0.2.2

  • Fixed binding events in the collection view to use bindTo (#6)
  • Updated specs for collection view
  • Documentation fixes (#7)

v0.2.1

  • Added TemplateManager to cache templates
  • CollectionView binds to add/remove and updates rendering appropriately
  • ItemView uses TemplateManager for template retrieval
  • ItemView and CollectionView set this.el = $(this.el) in constructor

v0.2.0

  • Added ItemView
  • Added CollectionView
  • Added BindTo
  • Simplified the way extend is pulled from Backbone

v0.1.0

  • Initial release
  • Created documentation
  • Generated annotated source code

Legal Mumbo Jumbo (MIT License)

Copyright (c) 2011 Derick Bailey, Muted Solutions, LLC

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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