What you need to know about AngularJS
Published: 2023-10-04 21:13:58

AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. AngularJS’s data binding and dependency injection eliminate much of the code you would otherwise have to write.
AngularJS is a JavaScript-based open-source front-end web application framework maintained by Google and a community of developers. It’s designed to facilitate the development of dynamic, single-page web applications.
Key features and concepts of AngularJS include:
1. Two-Way Data Binding: This allows automatic synchronization between the model and the view, reducing the need for manual DOM manipulation.
2. Directives: Custom HTML attributes or elements that extend the functionality of HTML, enabling the creation of reusable components.
3. Modules: Units of organization within an AngularJS application, helping to structure the code into smaller, manageable pieces.
4. Controllers: JavaScript functions that handle data and behavior for a specific part of the application, maintaining the separation of concerns.
5. Dependency Injection: A design pattern to manage components’ dependencies and promote reusability and testability.
6. Services: Singleton objects that carry out specific tasks, providing a way to share functionality across the application.
7. Templates: HTML with embedded AngularJS expressions, defining how the application’s user interface should be rendered.
8. Routing: Navigation and routing capabilities for creating single-page applications with multiple views.
9. Filters: Used to format data for display in the UI without changing the underlying data.
10. Testing: AngularJS supports testing with tools like Jasmine and Karma, ensuring robust and reliable code.
It’s important to note that AngularJS (often referred to as Angular 1.x) was a pioneering framework in its time. However, Angular (version 2 and onwards) has since been released, providing significant improvements and changes in architecture. If you’re looking for the latest and most widely used version of Angular, you may want to explore Angular (the newer versions) as it offers enhanced features, performance, and development practices.
AngularJS operates using a component-based architecture and utilizes various core concepts to create dynamic and interactive web applications. Here’s a breakdown of how it operates:
1. Modules: AngularJS applications are organized into modules, which are containers for different parts of an application like controllers, services, directives, and more. Modules help in structuring the application and keeping related functionality together.
2. Controllers: Controllers are JavaScript functions that manage the application’s data and behavior. They are responsible for setting up the initial state of the application and binding data to the view. Controllers interact with the view through AngularJS directives.
3. Directives: Directives are custom HTML attributes or elements that extend HTML’s functionality. They allow you to create reusable components and add behavior to the DOM. AngularJS comes with built-in directives and allows you to create custom directives as well.
4. Two-Way Data Binding: AngularJS implements two-way data binding, which means that any changes in the model (JavaScript variables) automatically update the view, and vice versa. This helps in keeping the UI in sync with the underlying data.
5. Templates: Templates are HTML files with special AngularJS expressions embedded in them. These expressions are evaluated and replaced with the actual data from the model. Templates define how the UI should look based on the application’s state.
6. Scope: The scope is a JavaScript object that serves as a bridge between the controller and the view. It provides properties and functions that can be accessed in the HTML, enabling communication between the two.
7. Services: Services are singleton objects used for encapsulating shared business logic, data, or utilities. They provide a way to maintain state and share functionality across different parts of the application.
8. Dependency Injection: AngularJS utilizes a built-in dependency injection system to manage the dependencies of components. It allows for better modularity, testability, and maintainability by making components easier to replace and upgrade.
9. Routing: AngularJS includes a router that enables the creation of single-page applications with multiple views. The router allows users to navigate through different parts of the application without a full page refresh.
By leveraging these core concepts and features, AngularJS provides a robust framework for building dynamic, maintainable, and feature-rich web applications.
Prerequisites for Angular
Knowledge of HTML, CSS, and JavaScript.
JavaScript functions, error handling, and events.
Basic knowledge of the Document Object Model(DOM)
Model-View-Controller(MVC) concepts.
Knowledge of Node JS and Node Package Manager(npm)
Angular CLI.
Libraries such as Rx and JS.
Error handling.
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