Backbone Js Interview Questions And Answers

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Top Backbone Js interview questions and answers for freshers and experienced

What is Backbone Js ?

Answer : Backbone.js is a JavaScript library that provides structure to RESTful web applications.

Questions : 1 :: Explain what is backbone.js ?

Backbone.js is a JavaScript client-side (front end) framework, which helps to organize your code and makes it easier to develop single page applications.  It allows you to structure...View answers

Questions : 2 :: What are the main components of Backbone.js ?

The main component of Backbone.js are ModelViewCollectionRouterEvent class object

Questions : 3 :: Explain what is Backbone.js collections ?

An ordered set of models are represented by Backbone.js collections. Any event in model will trigger an event in collection directly.  For example, you can bind “change”...View answers

Questions : 4 :: Explain what is Backbone.js router is used for ?

Whenever an application want to change their URL fragment in order to provide bookmarkable and shareable URLs for an Ajax heavy application, backbone.js router is...View answers

Questions : 5 :: What is Backbone events ?

Backbone events is a module that can be mixed in to any object,  giving the object the ability to bind and trigger custom named events.  Events are not declared before they are...View answers

Questions : 6 :: What are the keypoints of Backbone ?

-It has hard dependency with underscore.js to make it more functional and supporting a range of useful collection based operations-With jQuery it has a soft dependency-When the model changes it can...View answers

Questions : 7 :: Why you have to use Backbone ? Advantages ?

-By using JavaScript with the minimal set of data-structuring ( models & collections) and user interface (views & URLs) it enables you to develop a web application-Backbone is best useful to...View answers

Questions : 8 :: What are the three js files that you require to setup a working environment for backbone?

you are required following three js files to setup a working environment for backbone jQueryBackboneUnderscore In your application put these files within js folder and use it in your...View answers

Questions : 9 :: Explain when you require Backbone.js ?

Backbone.js is required in following condition -When developing a web application that requires a lot of JavaScript-It is required when you want to give structure to your code, if your application...View answers

Questions : 10 :: Explain what is view in Backbone.js?

Backbone view is a Javascript object that manages a specific DOM element and descendants. Views are not HTMLIt is a description of a modelThe HTML code comes from templatesWorks with any template...View answers

Questions : 11 :: Explain what is Backbone.js Models?

Backbone.js models are object and core of backbone.js. It contains an array of attributes and listens for events. To represent your data, Backbone provides a model object.  For...View answers

Questions : 12 :: Explain what is Modelbinder in Backbone.js ?

To make synchronization process of views and models together, ModelBinder class is...View answers

Questions : 13 :: What is the most powerful capabilities of the ModelBinder ?

The most powerful capabilities of ModelBinder class is that it enables you to define scope when you create your bindings using jQuery. *If your views are simple, you can rely on default scoping...View answers

Questions : 14 :: Explain what is Converter in Backbone.js ?

A function is called when model’s attribute is copied to an html element or when an html element value is copied into a model’s attribute, this function is referred as Converter...View answers

Questions : 15 :: What is model.attributes ?

The attributes property is the internal hash containing the model’s state,  usually a form of the JSON object representing the model data on the server. It is often a...View answers

Questions : 16 :: What is the function of toJSON ?

It returns a shallow copy of the model’s attribute for JSON stringification. This function is used for persistence, serialization and for augmentation before being sent to the server....View answers

Questions : 17 :: Explain when you can use Unbinding function in Backbone.js ?

When you want to remove the validation binding on the model or all models , removing all events hooked up on the collection, you can use Unbinding function. For example...View answers

Questions : 18 :: What are the configuration options available ?

The configuration options available are -InitialCopyDirection-modelSetOptions-change...View answers

Questions : 19 :: Mention what are the typical problems you might face with the Backbone view code ?

*Application models don’t change very often*Application pages are frequently refreshed from scratch from the server*Between different view models are not shared

Questions : 20 :: What is the function of escape ?

It gets the current value of an attribute from the model but returns the HTML-escaped version of a model’s attribute.  It is helpful in preventing XSS attacks, if you are...View answers

Questions : 21 :: Explain what is the function of parse ?

Whenever a model’s data is returned by the server, in fetch and save , this data is called parse. It is called by Backbone whenever a collection’s models are returned...View answers

Questions : 22 :: What is Backbone.sync is used for ?

When Backbone wants to save or read a model to the server it calls out a function called as...View answers

Questions : 23 :: In Backbone View, what is the use of setElement ?

setElement function is used when Backbone view has to be applied to a different DOM...View answers

Questions : 24 :: Explain what is model.cid ?

Model.cid works as a unique identifier. It is a special property of models, the cid or client id is automatically assigned to all models when they are first created. This property is useful...View answers

Questions : 25 :: How to override Backbone.sync?

Basically Backbone.sync should be a function that takes 4 arguments:Backbone.sync = function(method, model, options) { };You need to fire either options.success or options.error depending on whether...View answers

Questions : 26 :: What is the purpose of backbone.js?

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...View answers

Questions : 27 :: How do I fetch a single model in Backbone?

url : function() { var base = 'clocks'; if (this.isNew()) return base; return base + (base.charAt(base.length - 1) == '/' ? '' : '/') +;}, This approach assumes that you have...View answers
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