AngularJS Interview Questions with Answers: Guide to Success

The purpose of this question is to assess the candidate’s understanding of the AngularJS framework and its core functionalities. 

Here’s a sample answer: 

AngularJS is a structural framework for dynamic web applications. It allows HTML to be used as the template language and extends HTML's syntax to express application components clearly and succinctly. AngularJS features MVC architecture, two-way data binding, dependency injection, directives, and testing capabilities for robust, scalable front-end applications.

The purpose of this question is to assess the candidate’s understanding of the scope in AngularJS as a crucial execution context.

Here’s a sample answer: 

In AngularJS, a scope is an object that refers to the application model. It acts as an execution context for expressions, serving as the intermediary between the controller and the view. Scopes are hierarchical and can watch expressions and propagate events, which makes them fundamental for data binding in AngularJS applications. 

This question aims to gauge the candidate’s understanding of services in AngularJS, which are essential for maintaining clean code and reusability. 

Here’s a sample answer: 

Services in AngularJS are singleton objects or functions that are used for carrying out specific tasks. They encapsulate reusable functionalities like business logic and models, maintainable through injection into controllers, directives, and services. 

The purpose of this question is to assess the candidate’s comprehension of directives in AngularJS, which are fundamental building blocks of AngularJS applications. 

Here’s a sample answer: 

Directives are markers on DOM elements (such as elements, attributes, comments or CSS classes) that tell AngularJS's HTML compiler ($compile) to attach a specified behaviour to that DOM element (e.g., via event listeners) or even to transform the DOM element and its children. Directives are powerful because they extend HTML and contribute to building reusable components. 

This question aims to evaluate the candidate’s knowledge of the data binding mechanism in AngularJS, which is central to interactive applications. 

Here’s a sample answer: 

Data binding in AngularJS is the automatic synchronisation of data between the model and view components. When the model changes, the view reflects the change, and when the view changes, the model is updated as well. 

The purpose of this question is to evaluate the candidate’s understanding of interpolation in AngularJS, which is a key feature for embedding expressions into HTML. 

Here’s a sample answer: 

Interpolation in AngularJS uses double curly braces ‘{{}}’ to bind data from the model to the view dynamically. It evaluates the expression within the braces and updates the HTML with the result whenever the data changes. 

This question aims to assess the candidate’s ability to integrate AngularJS into HTML, which is crucial for creating interactive and dynamic web applications. 

Here’s a sample answer: 

“To integrate AngularJS with HTML, I would first add the AngularJS library to the HTML document using a ‘

In this example, ‘ng-view’ dynamically loads either ‘home.html’ or ‘about.html’ into the placeholder, depending on the current path in the URL, managed by Angular's routing mechanism. 

The purpose of this question is to evaluate the candidate's practical programming skills in AngularJS, focusing on event handling and DOM manipulation. 

Here’s a sample answer: 

To hide an HTML tag with a button, click in AngularJS; you can use the ‘ng-click’ directive to bind a click event to a function that toggles a Boolean scope variable and ‘ng-show’ or ‘ng-hide’ to conditionally display the HTML tag based on the state of the Boolean variable. For example: 

Html code:
 

Javascript code:
 

The purpose of this question is to evaluate the candidate's understanding of the factory method in AngularJS, which is essential for creating reusable services within an application. 

Here’s a sample answer: 

The factory method in AngularJS defines a service returning an object with methods and properties, facilitating injection and reuse across the app. By defining a function generating this object, it encapsulates functionalities for clean, modular code, separating concerns effectively. 

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