This AngularJS tutorial is designed for beginners as well as professionals, which covers a wide range of important topics, including AngularJS Expressions, AngularJS directives, AngularJS Data Binding, AngularJS controllers, AngularJS modules, AngularJS scopes, filters, and more.
Additionally, we also provide AngularJS interview questions to help you deepen your understanding of the framework and prepare for potential job opportunities.
What is AngularJS?
AngularJS is an open-source, client-side framework that allows developers to build dynamic and responsive web applications. It extends HTML with new attributes and binds data to HTML with expressions. The framework is designed to make both the development and testing of such applications more accessible by providing a well-defined structure and a set of tools.
Key Concepts in AngularJS
- MVC Architecture: AngularJS follows the Model-View-Controller (MVC) architectural pattern, which separates the application logic into three interconnected components:
- Model: Represents the data and business logic.
- View: Handles the presentation and user interface.
- Controller: Manages the communication between the Model and the View.
- Two-Way Data Binding: One of the standout features of AngularJS is its two-way data binding. This means that changes in the user interface automatically update the underlying data model and vice versa. This simplifies the synchronization of data between the view and the model, reducing the need for manual manipulation.
- Directives: Directives are markers in the DOM that tell AngularJS to attach a specified behavior to a DOM element or transform the DOM’s structure. They enhance HTML with new functionalities and enable the creation of reusable components. Common directives include
- Services: AngularJS includes a set of built-in services that provide common functionalities, such as HTTP requests, routing, and more. Developers can also create custom services to encapsulate specific features and share them across different components.
- Dependency Injection: Dependency Injection (DI) is a design pattern used in AngularJS that allows components to be loosely coupled. This enhances modularity and makes testing more straightforward. AngularJS has its own dependency injection system that manages the creation and injection of components.
Getting Started with AngularJS
- Setting Up the Environment: To start using AngularJS, you can include it in your project using a CDN or download it locally. You’ll also need a text editor for coding and a web browser for testing.
- Creating Your First AngularJS App: AngularJS applications typically consist of modules, controllers, and views. Create an HTML file, define an AngularJS module, and attach a controller to it. Use directives to bind data and create dynamic content.
- Understanding Data Binding: Experiment with two-way data binding to see how changes in the UI affect the underlying data and vice versa. This is a fundamental aspect of AngularJS that enhances the responsiveness of your applications.
- Working with Directives and Services: Explore built-in directives like
ng-repeat for iterating through arrays and
ng-if for conditional rendering. Additionally, leverage services like
$http for making HTTP requests to external APIs.
- Implementing Routing: AngularJS supports client-side routing, allowing you to create SPAs with multiple views. Integrate the AngularJS router to navigate between different sections of your application without full-page reloads.
Why use AngularJS?
- Time-saving: AngularJs allows us to work with components and hence we can use them again which saves time and unnecessary code.
- Ready to use template: AngularJs is mainly plain HTML, and it mainly makes use of the plain HTML template and passes it to the DOM and then the AngularJS compiler. It traverses the templates and then they are ready to use.
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