What is the purpose of backbone js

Question

I tried to understand the utility of backbone js from its site http   documentcloud github com backbone  but I still couldn t figure out much   Can anybody help me by explaining how it works and how could it be helpful in writing better JavaScript

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So many good answers already  Backbone js helps to keep the code organised  Changing the model collection takes care of the view rendering automaticallty which reduces lot of development overhead    Even though it provides maximum flexibility for development  developers should be careful to destroy the models and remove the views properly  Otherwise there may be memory leak in the application

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Backbone was created by Jeremy Ashkenas who also wrote CoffeeScript  As a JavaScript-heavy application  what we now know as Backbone was responsible for structuring the application into a coherent code base  Underscore js  backbone s only dependency  was also part of the DocumentCloud application   Backbone helps developers manage a data model in their client-side web app with as much discipline and structure as you would get in traditional server-side application logic   Additional benefits of using Backbone js   See Backbone as a library  not as a framework Javascript is now getting organized in a structured way  the  MVVM  Model Large user community

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If you re going to build complex user interfaces in the browser then you will probably find yourself eventually inventing most of the pieces that make up frameworks like Backbone js and Sammy js  So the question is  are you building something complicated enough in the browser to merit using it  so you don t end up inventing the same thing yourself    If what you plan to build is something where the UI regularly changes how it displays but does not go to the server to get entire new pages then you probably need something like Backbone js or Sammy js  The cardinal example of something like that is Google s GMail  If you ve ever used it you ll notice that it downloads one big chunk of HTML  CSS  and JavaScript when you first log in and then after that everything happens in the background  It can move between reading an email and processing the inbox and searching and back through all of them again without ever asking for a whole new page to be rendered   It s that kind of app that these frameworks excel at making easier to develop  Without them you ll either end up glomming together a diverse set of individual libraries to get parts of the functionality  for example  jQuery BBQ for history management  Events js for events  etc   or you ll end up building everything yourself and having to maintain and test everything yourself as well  Contrast that with something like Backbone js that has thousands of people watching it on Github  hundreds of forks where people may be working on it  and hundreds of questions already asked and answered here on Stack Overflow   But none of it is of any importance if what you plan to build is not complicated enough to be worth the learning curve associated with a framework  If you re still building PHP  Java  or something else sites where the back end server is still doing all the heavy lifting of building the web pages upon request by the user and JavaScript jQuery is just icing upon that process  you aren t going to need or are not yet ready for Backbone js

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It also adds routing using controllers and views with KVO  You ll be able to develop  AJAXy  applications with it   See it as a lightweight Sproutcore or Cappuccino framework

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backbone js is Model-View-Controller  MVC  with JavaScript but Extjs better than backbone  for MVC Pattern by java script  With backbone you got freedom to do almost anything you wish for  Rather than trying to fork through the api and customize I would use Backbonejs for it s simplicity and ease of implementation  Again it is hard to say what you require out of the two one is a library another a component

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Here s a quick Get Started post I wrote on BackboneJS  Hope it helps  http   www infragistics com community blogs nanil archive 2013 04 01 exploring-javascript-mv-frameworks-part-1-hello-backbonejs aspx

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This is a pretty good introductory video  http   vimeo com 22685608  If you are looking for more on Rails and Backbone  Thoughtbot has this pretty good book  not free   https   workshops thoughtbot com backbone-js-on-rails

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Here s an interesting presentation   An intro to Backbone js  Hint  from the slides      Rails in the browser  No    An MVC framework for JavaScript  Sorta    A big fat state machine  YES

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Backbone is        a very small library of components which you can use to help organise your code  It comes packaged as a single JavaScript file  Excluding comments  it has less than 1000 lines of actual JavaScript  It s sensibly written and you can read the whole thing in a couple of hours   It s a front-end library  you include it in your web page with a script tag  It only affects the browser  and says little about your server  except that it should ideally expose a restful API    If you have an API  Backbone has a few helpful features that will help you talk to it  but you can use Backbone to add interactivity to any static HTML page   Backbone is for        adding structure to JavaScript   Because JavaScript doesn t enforce any particular patterns  JavaScript applications can become very messy very quickly  Anyone who has built something beyond trivial in JavaScript will have likely run up against questions such as    Where will I store my data  Where will I put my functions  How will I wire my functions together  so that they are called in a sensible way and don t turn to spaghetti  How can I make this code maintainable by different developers    Backbone seeks to answer these questions by giving you    Models and Collections to help you represent data and collections of data  Views  to help you update your DOM when your data changes  An event system so that components can listen to each other  This keeps your components de-coupled and prevents spaghettification  A minimal set of sensible conventions  so developers can work together on the same codebase    We call this an MV  pattern  Models  Views and optional extras   Backbone is light  Despite initial appearances  Backbone is fantastically light  it hardly does anything at all  What it does do is very helpful   It gives you a set of little objects which you can create  and which can emit events and listen to each other  You might create a little object to represent a comment for example  and then a little commentView object to represent the display of the comment in a particular place in the browser   You can tell the commentView to listen to the comment and redraw itself when the comment changes  Even if you have the same comment displayed in several places on your page all these views can listen to the same comment model and stay in sync   This way of composing code helps to keep you from getting tangled even if your codebase becomes very large with many interactions   Models  When starting out  it s common to store your data either in a global variable  or in the DOM as data attributes  Both of these have issues  Global variables can conflict with each other  and are generally bad form  Data attributes stored in the DOM can only be strings  you will have to parse them in and out again  It s difficult to store things like arrays  dates or objects  and to parse your data in a structured form   Data attributes look like this    lt p data-username  derek  data-age  42  gt  lt  p gt    Backbone solves this by providing a Model object to represent your data and associated methods  Say you have a todo list  you would have a model representing each item on that list    When your model is updated  it fires an event  You might have a view tied to that particular object  The view listens for model change events and re-renders itself    Views  Backbone provides you with View objects that talk to the DOM  All functions that manipulate the DOM or listen for DOM events go here    A View typically implements a render function which redraws the whole view  or possibly part of the view  There s no obligation to implement a render function  but it s a common convention   Each view is bound to a particular part of the DOM  so you might have a searchFormView  that only listens to the search form  and a shoppingCartView  that only displays the shopping cart   Views are typically also bound to specific Models or Collections  When the Model updates  it fires an event which the view listens to  The view might them call render to redraw itself   Likewise  when you type into a form  your view can update a model object  Every other view listening to that model will then call its own render function   This gives us a clean separation of concerns that keeps our code neat and tidy   The render function  You can implement your render function in any way you see fit  You might just put some jQuery in here to update the DOM manually    You might also compile a template and use that  A template is just a string with insertion points  You pass it to a compile function along with a JSON object and get back a compiled string which you can insert into your DOM   Collections  You also have access to collections which store lists of models  so a todoCollection would be a list of todo models  When a collection gains or loses a model  changes its order  or a model in a collection updates  the whole collection fires an event    A view can listen to a collection and update itself whenever the collection updates   You could add sort and filter methods to your collection  and make it sort itself automatically for example   And Events to Tie It All Together  As much as possible  application components are decoupled from each other  They communicate using events  so a shoppingCartView might listenTo a shoppingCart collection  and redraw itself when the cart is added to    shoppingCartView listenTo shoppingCart   add   shoppingCartView render     Of course  other objects might also be listening to the shoppingCart as well  and might do other things like update a total  or save the state in local storage    Views listen to Models and render when the model changes  Views listen to collections and render a list  or a grid  or a map  etc   when an item in the collection changes  Models listen to Views so they can change state  perhaps when a form is edited    Decoupling your objects like this and communicating using events means that you ll never get tangled in knots  and adding new components and behaviour is easy  Your new components just have to listen to the other objects already in the system   Conventions  Code written for Backbone follows a loose set of conventions  DOM code belongs in a View  Collection code belongs in a Collection  Business logic goes in a model  Another developer picking up your codebase will be able to hit the ground running   To sum up  Backbone is a lightweight library that lends structure to your code  Components are decoupled and communicate via events so you won t end up in a mess  You can extend your codebase easily  simply by creating a new object and having it listen to your existing objects appropriately  Your code will be cleaner  nicer  and more maintainable    My little book  I liked Backbone so much that I wrote a little intro book about it  You can read it online here  http   nicholasjohnson com backbone-book   I also broke the material down into a short online course  which you can find here  http   www forwardadvance com course backbone  You can complete the course in about a day

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JQuery and Mootools are just a toolbox with lot of tools of your project  Backbone acts like an architecture or a backbone for your project on which you can build an application using JQuery or Mootools

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A web application involving lot of user interaction with many AJAX requests  which needs to be changed from time to time  and which runs in real time  such as Facebook or StackOverflow  ought to use an MVC framework such as Backbone js  It s the best way to build good code    If the application is only small though  then Backbone js is overkill  especially for first time users   Backbone gives you client side MVC  and all the advantages implied by this

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I have to admit that all the  advantages  of MVC have never made my work easier  faster  or better   It just makes the whole codeing experience more abstract and time consuming   Maintenance is a nightmare when trying to debug someone elses conception of what separation means   Don t know how many of you people have ever tried to update a FLEX site that used Cairngorm as the MVC model but what should take 30 seconds to update can often take over 2 hours  hunting tracing debugging just to find a single event    MVC was and still is  for me  an  advantage  that you can stuff

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Backbone js is basically an uber-light framework that allows you to structure your Javascript code in an MVC  Model  View  Controller  fashion where      Model is part of your code that retrieves and populates the data    View is the HTML representation of this model  views change as models change  etc     and optional Controller that in this case allows you to save the state of your Javascript application via a hashbang URL  for example  http   twitter com  search q backbone js  Some pros that I discovered with Backbone     No more Javascript Spaghetti  code is organized and broken down into semantically meaningful  js files which are later combined using JAMMIT No more jQuery data bla  bla   no need to store data in DOM  store data in models instead event binding just works extremely useful Underscore utility library backbone js code is well documented and a great read  Opened my eyes to a number of JS code techniques    Cons    Took me a while to wrap my head around it and figure out how to apply it to my code  but I m a Javascript newbie    Here is a set of great tutorials on using Backbone with Rails as the back-end   CloudEdit  A Backbone js Tutorial with Rails   http   www jamesyu org 2011 01 27 cloudedit-a-backbone-js-tutorial-by-example   http   www jamesyu org 2011 02 09 backbone js-tutorial-with-rails-part-2   p s  There is also this wonderful Collection class that lets you deal with collections of models and mimic nested models  but I don t want to confuse you from the start

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Is an MVC design pattern on the client side   believe me    It s gonna save you tons of code  not to mention a more clean and clear code  a more easy to maintain code   Could be a little tricky at first  but believe me it s a great library

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Backbone js is a JavaScript framework that helps you organize your code   It is literally a backbone upon which you build your application  It doesn t provide widgets  like jQuery UI or Dojo     It gives you a cool set of base classes that you can extend to create clean JavaScript code that interfaces with RESTful endpoints on your server

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