AngularJS Interview Question and Answers
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1.What is Angular.js?
2.In which language, AngularJS is written?
3.Is it opensource?
Yes, It is free to use.
4.What Are The Main Features Of AngularJS ?
5.Explain what is scope in Angular.js ?
Scope refers to the utility model, it acts like glue among application controller and the view. Scopes are arranged built-in hierarchical structure and impersonate the DOM ( document object model) structure of the application. it could watch expressions and propagate activities.
6.What is data binding in AngularJS?
Data binding is the automatic synchronization of information data between model and view components. ng-model directive is used in data binding.
7.What are the controllers in AngularJS?
8.What are the services in AngularJS?
AngularJS come with numerous built-in services. For example $https: service is used to make XMLHttpRequests (Ajax calls). Services are singleton objects which might be instantiated best only once in app.
9.What are the filters in AngularJS?
Filters choose a subset of items from an array and return a new array. Filters are used to reveal filtered items from a listing of items based on defined criteria.
10.Explain directives in AngularJS?
Directives are markers on DOM elements such as elements, attributes, css, and more Those may be used to create custom HTML tags that serve as new, custom widgets. AngularJS has built-in directives (ng-bind, ng-model, etc) to carry out maximum of the project that developers ought to do.
11.Explain templates in AngularJS?
Templates are the rendered view with data from the controller and model. those can be a single file (like index.html) or multiple perspectives in a single web page the use of "partials".
12.What is routing in AngularJS?
It is concept of switching views. AngularJS based controller makes a decision which view to render based on the business logic.
13.What is deep linking in AngularJS?
Deep linking allows you to encode the state of application with in the URL in order that it can be bookmarked. The application can then be restored from the URL to the identical state.
14.What are the advantages of AngularJS?
Able to create Single Page Application.
data binding capability
code is unit testable
run on all major browsers and smart phones
excellent experience to the end user
15.What are AngularJS expressions?
16.what the different types of Directive in AngularJS?
ng-app − This directive starts an AngularJS Application.
ng-init − This directive initializes application data.
ng-model − This directive ties the value of HTML controls (input, select, textarea) to application data.
ng-repeat − This directive repeats html elements for each item in a collection.
17.What are the key differences between AngularJS and jQuery?
It is a Framework
used for DOM Manipulations
Used for creating SPA (Single Page Applications)
Easy to maintain when project size increases
Difficult to maintain when project size increases
Don't have two-way binding feature
Have two-way binding feature
JQuery is a tool
It is a Toolbox
18.What Are Different Types of Directives?
There are four types of directives:
CSS class directives
19.What is use of $routeProvider in AngularJS?
$routeProvider is the key administration which set the arrangement of urls, maps them with the comparing html website page or ng-layout, and appends a controller with the equivalent.
20.What is $rootScope?
21.What is service method?
Using service method, we define a service after which assign the method to it.
22.Explain what are factory method in angularJs?
Factory method are used to create the directive. It is invoked most effective as soon as, when compiler matches the directive for the first time.
23.What are the differences between service and factory methods?
Factory method is is utilized to define a factory that could be later utilized to create services as and when required whereas service method is used to create a service whose motive is to do some described task.
24.what is an injector?
An injector is a service locator. It is used to retrieve object instances as described by provider, instantiate types, invoke methods and load modules. There is a single injector per Angular application, it allows to look up an object instance by its name.
25.Which components can be injected as a dependency in AngularJS?
AngularJS gives a preferrred Dependency Injection mechanism. It gives following core components which may be injected into every other as dependencies.
26.Is AngularJS extensible?
Yes Sure.In AngularJS we are able to create custom directive to extend AngularJS current functionalities.
27.On which types of component can we create a custom directive?
AngularJS gives support to create custom directives for following kind of elements.
Element directives − It actuates when a matching element is encountered.
Attribute − Directive initiates when a coordinating attribute is experienced.
CSS − It actuates when a coordinating css style is experienced
Comment − It initiates when a matching comment is encountered.
28.What is a scope in AngularJS?
scope is an built-in object that refers to the application model. it's far the glue among utility controller and the view. Both the controllers and directives have reference to the scope, but now not with each different. It is an execution setting for expressions and organised in a progressive structure. Scopes can watch expressions and propagate events.
29.How to validate data in AngularJS?
AngularJS enriches form filling and validation. We are able to use $dirty and $invalid flags to do the validations in seamless manner. Use no validate property with a form declaration to disable any browser specific validation to ensure validation would done by Angular js.
Following may be used to track error.
• $dirty − Denotes that value has been changed.
• $invalid − Denotes that value entered is invalid.
• $pristine The field value has not been modified yet.
• $error − states the precise error.
30.How to implement internationalization in AngularJS?
AngularJS helps inbuilt internationalization for three types of filters currency, date and numbers. We best want to incorporate corresponding js according inline with locale of the country.