AngularJS Interview Questions and Answers

How to validate form data in AngularJS?

AngularJS has enriches client-side form filling validation. It support HTML 5 validations and also allow to creationof custom validation to validate data.
For example following can be used to track error: 
•    $dirty - states that value has been changed.
•    $invalid- states that value entered is invalid.
•    $touched-states that value has been touched.

Explain the concept of Watchers, Dirty checking and Digest cycle?

The data-bindings in AngularJS can be achieved via Watchers, Dirty checking and Digest cycle concept-
Watchers: Angular creates a watcher that observes the view property, which will be triggered whenever the model changes, allowing Angular to update the view content.
Dirty checking: It is the process to check whether the item has been changed or not by comparing a value with its previous value, and if it has changed then a change event is fired.
Digest cycle: when any change happens in the model the view gets updated. This updating of the model and the view is done by a loop called as digest cycle.

What is dependency injection and how does it work in Angular?

Dependency injection is a software design pattern where we inject the dependent objects rather than consumer creating the objects. 
There are two big benefits of DI: - Decoupling and Testing.

How to make an Ajax call using AngularJS?

AngularJS provides $http control which works as a service to make ajax call to read data from the server. The server makes a database call to get the desired records. AngularJS needs data in JSON format. Once the data is ready, $http can be used to get the data from server in the following manner:
functionajaxController($scope,$http) {
varurl="serverData.txt";
$http.get(url).success( function(response) {
   $scope.showdataonPage = response; 
});

How do we make HTTP get and post calls in Angular?

To make HTTP calls we need to use the “$http” service of Angular. In order to use the http services you need to make provide the “$http” as an input in your function parameters as shown in the below code.
$http({ method: "GET", url: "http://localhost/SomeMethod"     }).success(function (data, status, headers, config)
        {                   // Here goes code after success        }
$http({ method: "POST", url: "http://localhost/SomeMethod "}).success(function (data, status, headers, config)
    {      // Here goes code after success    }

Explain ng-app directive?

The ng-app directive is used to bootstrap an AngularJS application.It can also be used to declare module for an application and for initialize the angular expression variable.

Explain ng-controller directive?

The ng-controller directive specifies a Controller thatbind with scope to populate view from model data.

Explain ng-model directive?

The ng-model bind the view property by evaluating the expression on the current scope. If the property doesn't already exist on this scope, it will be created implicitly and added to the scope.
The two way binding can enable on property with this directive.

Explain ng-click directive?

The ng-Click directive allows you to specify custom behavior and evaluation of expression when an element is clicked.
For ex;value of count changed when html button are clicked 
<button ng-click="count = count + 1" ng-init="count = 0">Increment</button>
count: {{count}}

Explain ng-repeat directive?

The ng-Repeat directive will repeat the instance of the element upon which it is declared for each item in a collection.

There are following variable we can used with this directive
$index : Iterator offset of the repeated element (0..length-1)
$first : True, if the repeated element is first in the iterator
$middle : True, if the repeated element is between first and last in the iterator
$last : True, if the repeated element is last in the iterator
$even : True, if the iterator position $index is even (otherwise, false)
$odd : True, if the iterator position $index is odd (otherwise, false)

Explain ng-show and ng-hide directive?

The ng-Show directive shows or hides the given HTML element based on the expression provided to the ng-Show attribute. And samethe ng-Hide directive shows or hides the given HTML element based on the expression provided to the ng-Hide attribute.

Latest Updates

Apache Tomcat

What is the difference between Apache Tomcat server and Apache web server?

MS-DOS

What is the full form of DOS?

Explain the use of help DOS Command?

How we can create a directory in DOS?

Analogy

Riddle:Solve

Limp:Walk

Molecule:Atoms

Misfortune:Catastrophe

Pipes and Cistern

A tank can be filled by one tap in 10 minutes and by another in 30 minutes. Both the taps are kept open for 5 minutes and then the first one is shut off. In how many minutes more is the tank completely filled?

Simplification

Assume that a sum of money is divided equally among n girls. Each girl will receive $60. If another girl is added to the group and the sum is divided equally among all the girls, each child girl gets a $50 share. What is the sum of money?

Problems on Trains

A 300 meter long metro train crosses a platform in a metro station in 39 seconds while it crosses a lamp post in 18 seconds. What is the length of the platform?

Problems on Ages

In a group of 7 people, the average age is found to be 17 years. Two more people joined with an average age 19 years. One person left the group whose age was 25 years. What is the new average age of the group?

Profit and Loss

Irvin sold a book at a profit of 12%. If Irvin had sold it for Rs 18 more, then 18% would have been gained. Find the cost price?

Chemistry

Non stick cooking utensils are coated with?

The group of metals Co, Ni, Fe may best called as?

General Knowledge of India

'Kanchipuram' is in which of the following states?

General Knowledge of World

In which year was Pulitzer Prize established?

Indian History

The roads of cities in the Indus Valley Civilization generally divided the city into?

Latest Job Notifications

Jobs in West Bengal

इंडियन पोस्ट सर्विस Indian Post Service - 2357 पद - 19/08/2021 अंतिम तिथि - पश्चिम बंगाल पोस्टल सर्कल

Banking Jobs

भारतीय स्टेट बैंक State Bank of India(SBI) - 6100 पद - 26/07/2021 अंतिम तिथि - CRPD/APPR/2021-22/10

SSC Recruitment

कर्मचारी चयन आयोग Staff Selection Commission(SSC) - 25271 पद - 31/08/2021 अंतिम तिथि

Jobs in Madhya Pradesh

राष्ट्रीय स्वास्थ्य मिशन मध्य प्रदेश National Health Mission MP(NRHM) - 5215 पद - 22/06/2021 अंतिम तिथि

Jobs in Punjab

पंजाब स्टेट पावर कॉर्पोरेशन लिमिटेड Punjab State Power Corporation Limited (PSPCL) - 2632 पद - 20/06/2021 अंतिम तिथि

Jobs in Chhattisgarh

स्वास्थ्य सेवा निदेशालय, छत्तीसगढ़ Department of Health & Family Welfare, Chhattisgarh - 267 पद - 26/06/2021 अंतिम तिथि

Government Jobs

दिल्ली सबऑर्डिनेट सर्विस सिलेक्शन बोर्ड Delhi Subordinate Services Selection Board(DSSSB) - 5807 पद - 03/07/2021 अंतिम तिथि

Jobs in Madhya Pradesh

राष्ट्रीय स्वास्थ्य मिशन मध्य प्रदेश National Health Mission MP(NRHM) - 2850 पद - 31/05/2021 अंतिम तिथि

Government Jobs

इंडियन पोस्ट सर्विस Indian Post Service - 4368 पद - 29/05/2021 अंतिम तिथि

दिल्ली सबऑर्डिनेट सर्विस सिलेक्शन बोर्ड Delhi Subordinate Services Selection Board(DSSSB) - 7236 पद - 24/06/2021 अंतिम तिथि