AngularJS introduced several key concepts that were revolutionary at the time:
- Two-way Data Binding: One of the standout features of AngularJS is its two-way data binding. This means that changes made to the user interface (UI) are automatically reflected in the underlying data model, and vice versa. This significantly reduces the amount of manual DOM manipulation and makes it easier to keep the UI and data in sync.
- Directives: Directives are custom HTML elements or attributes that enable the creation of reusable components and behavior. They allow developers to extend HTML syntax and create dynamic content. Examples include ng-model, ng-repeat, and ng-if.
- Dependency Injection: AngularJS has a built-in dependency injection system that makes it easier to manage and test components by allowing you to declare dependencies explicitly. This promotes modularity and maintainability in your code.
- MVC Architecture: AngularJS follows the Model-View-Controller (MVC) architectural pattern, separating the application logic, presentation, and data into distinct components. This helps keep code organized and maintainable.
- Templates and Expressions: AngularJS uses templates, which are HTML files enhanced with special syntax (expressions) that allow you to bind data and manipulate the DOM. Expressions are used to dynamically display data within the HTML template.
- Services: AngularJS allows the creation of services that can be shared across different parts of an application. These services provide a way to encapsulate and manage functionality that doesn’t belong directly to a specific controller or view.
- Routing: Although not as advanced as in later versions of Angular, AngularJS provides basic routing capabilities to create SPAs with multiple views, allowing users to navigate between different sections of an application without full page reloads.
While AngularJS played a pivotal role in the evolution of front-end development, it’s important to note that its official support has decreased as newer versions of Angular have been introduced. Developers are encouraged to migrate to newer versions of Angular for improved performance, security, and features.