🧰 AngularJS Introduction – Get Started with Core Fundamentals
🧲 Introduction – Start Your AngularJS Journey
AngularJS is a structural JavaScript framework maintained by Google for developing dynamic single-page applications (SPAs). It extends HTML’s capabilities through two-way binding, dependency injection, and modular architecture. This guide covers everything you need to understand AngularJS’s foundation, its architecture, setup, and how to build your first app.
🎯 What You’ll Learn:
- The key purpose and philosophy behind AngularJS
- Features that make it suitable for SPAs
- Environment setup and first AngularJS app
- MVC architecture, two-way binding, and controller patterns
📘 Topics Covered
| 🔹 Topic | 📌 Description |
|---|---|
| AngularJS Home, Overview, Features | Introduction to AngularJS, core principles, and key features |
| AngularJS Advantages & Disadvantages | Pros and cons in practical development |
| Environment Setup & First Application | How to install and create your first AngularJS application |
| Basics & MVC Architecture | Understanding models, views, controllers, and bindings |
🏠 AngularJS Home, Overview, Features
AngularJS is a front-end framework released in 2010 by Google, designed to simplify the development of SPAs. Key concepts include:
- Declarative HTML templates
- Two-way data binding
- Dependency Injection
- Built-in directives (
ng-model,ng-repeat,ng-if) - MVC (Model-View-Controller) support
🌟 AngularJS Advantages & Disadvantages
✅ Advantages:
- Two-way data binding makes DOM updates automatic
- Dependency injection enhances modularity and testability
- Built-in form validation and RESTful communication
- Strong community and long-term maintenance by Google
⚠️ Disadvantages:
- Performance issues with large data sets
- Deprecated and replaced by Angular (2+)
- Difficult learning curve with advanced features
- Lacks backward compatibility with Angular 2+
⚙️ AngularJS Environment Setup & First Application
🔧 Setup via CDN:
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script>
🚀 First AngularJS App:
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script>
angular.module('myApp', []).controller('MainCtrl', function($scope) {
$scope.greeting = 'Hello, AngularJS!';
});
</script>
</head>
<body ng-controller="MainCtrl">
<h1>{{ greeting }}</h1>
</body>
</html>
✅ Explanation:
ng-appinitializes the Angular app.ng-controllerbinds controller logic to the view.{{ greeting }}binds data from$scope.
🧱 AngularJS Basics & MVC Architecture
AngularJS follows the MVC pattern:
- Model – application data
- View – the rendered UI (HTML)
- Controller – binds model and view via
$scope
🔁 Two-way Binding:
<input ng-model="name">
<p>Hello, {{ name }}!</p>
Any changes in the input automatically reflect in the view.
📌 Summary – Recap & Next Steps
AngularJS introduces a declarative approach to building front-end applications using HTML templates, controllers, and data binding. Despite being legacy, it remains relevant in maintaining and understanding older web applications.
🔍 Key Takeaways:
- AngularJS is ideal for dynamic single-page apps
- Simplifies DOM handling through data binding
- Easy setup with CDN or npm
- Follows MVC architecture for clean separation of concerns
⚙️ Real-World Relevance:
AngularJS is still widely used in legacy enterprise apps and is crucial for developers supporting older projects or transitioning to Angular 2+.
❓ Frequently Asked Questions (FAQs)
❓ What is AngularJS used for?
✅ AngularJS is used to create dynamic, client-side single-page applications (SPAs) using HTML templates, two-way binding, and dependency injection.
❓ Is AngularJS still maintained?
✅ AngularJS is in Long Term Support (LTS) until December 2026. It is no longer developed with new features but still receives critical security updates.
❓ How is AngularJS different from Angular?
✅ AngularJS (v1.x) is based on JavaScript and MVC, while Angular (v2+) is based on TypeScript and follows a component-based architecture.
❓ Can I still use AngularJS in 2025?
✅ Yes, many legacy applications still use AngularJS. However, for new projects, Angular (v2+) or other modern frameworks are recommended.
❓ How do I start with AngularJS?
✅ You can start by including AngularJS via CDN or npm and defining your first app with ng-app, controllers, and binding expressions.
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