What Is Backbone.js?
The Backbone.js
is a JavaScript framework which facilitates us to organize your code and make
it easier to develop single page applications and reduce the development time.
It is font-end framework and also allows us to
structure JavaScript code in MVC (Model, View, and Controller) architecture.
It is developed by Jeremy Ashkenas, DocumentCloud Inc.
ü Initial release - October 13, 2010; 7 years ago
ü Stable release
- 1.3.3 / April 5, 2016; 22 months ago
It is designed for developing SPA (single-page applications) and
organizes way and reduces the development time by providing lots of inbuilt
functions.
It is a data binding frameworks and provides
functionality to access database and manipulates data.
Backbone.js follows Model-View- Controller (MVC) architecture.
ü Model
- It is a part of your code that populates and retrieves the data
ü View
- It is the HTML representation of this model
ü Controller
- It enables you to save your JavaScript application via a hash bang URL
What Are the Architecture of Backbone.js?
What Are the Initial Setup Steps of backbone.js?
ü Save
a reference to the global object
ü Create
a local reference to slice or splice
ü Save
the previous value of the Backbone variable, so that it can be restored later
on, if noConflict is used
ü Current
version of the library, Keep in sync with package.json
ü Require
Underscore, if we are on the server, and it’s not already present
ü Set
the JavaScript library that will be used for DOM manipulation and Ajax calls
ü Returns
a reference to this Backbone object
ü Turn
on emulateHTTP to support legacy HTTP servers
ü Turn
on emulateJSON to support legacy servers that can't deal with direct
application/json requests
Why you use backbone.js, not other frameworks?
ü It's
smaller
ü Backbone
is a library, not a framework, and plays well with others
ü Supports
to Two-way data-binding
ü Its
major focus on helpful methods to manipulate and query your data not HTML
widgets
ü Backbone
does not force you to use a single template engine.
ü Supports
to synchronous events
What Are the main components of backbone.js?
The main components are –
ü Model
ü View
ü Router
ü Event
class object
Model
- A Model manages an internal table of data attributes and triggers events when
any of data is modified.
View
- A View a JavaScript object that manages specific DOM elements
Router
- Backbone Router is used for routing client-side applications and connects
them to actions and events using URLs. Backbone.Router is used to create a
Router with Backbone.
Event
class object - Events is a module that can be
mixed in to any object, giving the object the ability to bind and trigger
custom named events.
In which language, backbone Js is written?
The backbone.js is written in JavaScript
language.
What Are the Advantages of backbone.js?
ü Provides
minimal set of data structure
ü API
with tons of functions
ü API
connection over a RESTful JSON interface
ü Provides
a way to manage and organize code
ü Robust
event handling
ü Views
and URL are user interface which are capable of binding to model and event
ü BackboneJs
provides the large scale application
What Are the disadvantages of backbone.js?
ü Application
models do not change very often
ü Application
pages are frequently refreshed from scratch from the server
ü Between
different view models are not shared
What Are the configuration options available in backbone.js?
ü InitialCopyDirection
ü modelSetOptions
ü Change
Triggers
ü boundAttribute
ü suppressThrows
ü converter
What is Model in Backbone.js?
The Models are used to represent s the data from
your server and its contains the -
ü Interactive
data
ü Conversions
ü Validations
ü Computed
properties
ü Access
control
ü Business
Logic
What is ModelBinder in Backbone.js?
The ModelBinder class is used to make
synchronization process of views and models together and It is ModelBinder most
powerful and useful capability of ModelBinder class.
What Is Events in backbone.js?
A backbone event is a module that can be mixed
into any object, giving the object the ability to bind and trigger custom named
events. Events are not declared before they are bound to any object.
Events
reflect the state of the model.
What Is Router in backbone.js?
Backbone Router is used for routing client-side
applications and connects them to actions and events using URLs.
Backbone.Router is used to create a Router with Backbone.
What Is collection in Backbone.js?
A collection is a group of models, handling the
loading which binds events when the model has been modified in the collection.
It is also supports sorting, filtering and saving
of new models to the server.
Example looks like -
var UserModel = Backbone.Model.extend({
initialize: function(){
console.log("Hey, I am
Anil Singh!");
}
});
var UsersCollection = Backbone.Collection.extend({
model: User
});
What Are the Dependencies of backbone.js?
What Are the three JS files that are required to setup a working
environment for Backbone.js?
There are three Dependencies in BackboneJs files
to setup a working environment for Backbone.js
ü Underscore.js
- It used for RESTful persistence and DOM manipulation.
ü jQuery
ü json2.js
In your application put these files within js
folder and use it in your index.html page.
What Is the use of backbone.js setElement?
The BackboneJs setElement function is used when
Backbone view has to be applied to a different DOM element.
What Is the function of toJSON?
The toJSON function is used for persistence,
serialization and for augmentation before being sent to the server.
What Is view in Backbone.js?
ü The
View is a JavaScript object that manages specific DOM elements
ü Views
are not HTML
ü View
is a description of a model
ü The
HTML code comes from templates
ü View
can work with any template system
What Is Unbinding function in Backbone.js?
The Unbinding function is used to remove the
validation binding on the model and removing all events hooked up on the
collection.
Its looks like -
Backbone.Validation.Unbind (view)
How to Create a Model in backbone.js?
Creating a Model in BackboneJs and its looks like
-
Users = Backbone.Model.extend({
initialize: function(){
alert("Welcome You, Anil!");
}
});
var person = new Users;
How to access a models data from a view in Backbone.js?
In order to access a models data from a view in
backbone.js you have to initialize your Model and it looks like -
var bookAuthor= Backbone.Model.extend({
initialize: function(){
console.log('intailized method called!');
},
defaults:{
names:['Anil','Sunil','Sushil']
}
});
var person_view = Backbone.View.extend({
initialize: function() {
this.model = new bookAuthor();
},
output: function(){
console.log(this.model.get('names'))
}
});
How To Use to Backbone.Sync function?
The Backbone.sync is a function that is BackboneJs
call every time it attempts to read or save a model to the server. By default,
it uses jQuery.ajax to make a RESTful JSON request and returns a jqXHR.
The method signature of Backbone.sync is sync (method, model, [options])
ü Method
– It is CRUD methods like create, read, update and delete
ü Model
– The model to be saved
ü Options
– It is a success and error callback
The default sync
handler maps CRUD to REST like -
ü Create
- POST /collection
ü Read
- GET /collection[/id]
ü Update
- PUT /collection/id
ü Patch
- PATCH /collection/id
ü Delete
- DELETE /collection/id
The Example looks like -
Backbone.sync = function(method, model) {
model.set('id', 786);
alert(JSON.stringify(model));
};
var author= new Backbone.Model({
author: "Anil Singh",
website: "https://www.code-sample.com"
});
author.save();
author.save({author: "Reena Singh"});
How To Use to Backbone.ajax function?
If you want to use your custom AJAX function, you must to do by
setting the Backbone.ajax and doesn't support the jQuery.ajax.
Syntax
-
Backbone.ajax = function(request) { ... };
What Are Events Types?
There are following events are available in -
ü on
- Used to bind a callback function to an object
ü off
- Used to Remove a previously-bound callback function from an object.
ü Trigger
- Used to Trigger callbacks for the given event
ü once
- It is very similar to On but only difference that is - bound callback to fire
only once before being removed.
ü listenTo
- Tell an object to listen to a particular event on another object
ü stopListening
- Tell an object to stop listening to events
ü listenToOnce
- It is very similar to listenTo but bound callback to fire only once before
being removed.
What Are the difference between id and cid?
The id
(model.id) is a special property of models,
arbitrary string and integer.
The cid
(model.cid) is a special property of
models, unique identifier automatically assigned to all models when they're
first created.
What Are the difference between idAttribute and attributes?
The idAttribute
(model.idAttribute) is model's unique identifier is stored under the id
attribute.
The attributes
property is the internal hash containing the model's state.
What Are the difference between Backbone.noConflict and Backbone.$
?
Backbone.noConflict
-
The Backbone.noConflict function is used to
displays the original value of Backbone object and also allows us to store
reference to a backbone.
Its looks like -
var noConflict = Backbone.noConflict();
Backbone.$
-
If you have multiple copies of jQuery on the
page, or simply want to tell Backbone to use a particular object as its DOM /
Ajax library, this is the property for you.
Its looks like -
Backbone.$ = require('jquery');
The BackboneJs contains the pieces -
ü Backbone.Model
– Like a Rails model minus the class methods. Wraps a row of data in business
logic
ü Backbone.Collection
– A group of models on the client-side, with sorting/filtering/aggregation
logic
ü Backbone.Router
– Rails routes.rb + Rails controller actions. Maps URLs to functions
ü Backbone.View
– A logical, re-usable piece of UI.
I hope you are
enjoying with this post! Please share with you friends. Thank you so much!
|
Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
|
