Online AngularJS Code Editor
Write, preview, and debug AngularJS applications in your browser. Experiment with scopes, controllers, two-way data binding, and custom directives.
🚀 AngularJS Live Editor
Comprehensive AngularJS Examples - Learn by Doing!
Architectural Guide to AngularJS (1.x)
AngularJS pioneered client-side Single Page Application (SPA) architecture by extending HTML with declarative custom attributes. By introducing the Model-View-Controller (MVC) paradigm to the frontend, it separated application state from direct DOM manipulation.
1. Two-Way Binding ($scope)
The model ($scope) and the view are synchronized automatically. When user input changes in the view, the model updates; when the model changes via code, the view reflects it without manual DOM queries.
2. Directives Ecosystem
Directives like ng-model, ng-repeat, and ng-click extend native HTML tags with reactive capabilities, eliminating procedural jQuery spaghetti code.
3. Dependency Injection
AngularJS features a built-in dependency injection system that automatically resolves and provides services (like $http, $timeout, $q) to your controllers.
Starter Template & Controller Recipe
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script>
</head>
<body ng-controller="MainCtrl">
<h2>Welcome, {{ username }}!</h2>
<input type="text" ng-model="username" placeholder="Enter your name" />
<h3>Your Tasks:</h3>
<ul>
<li ng-repeat="task in tasks">{{ task }}</li>
</ul>
</body>
<script>
angular.module('myApp', [])
.controller('MainCtrl', function($scope) {
$scope.username = 'Developer';
$scope.tasks = ['Learn Controllers', 'Master Scopes', 'Explore Filters'];
});
</script>
</html>Frequently Asked Questions
What is AngularJS and how does its two-way data binding work?
AngularJS (1.x) is Google's original MVW (Model-View-Whatever) JavaScript framework. Its signature feature is two-way data binding: changes in the view (input fields) automatically update the model ($scope), and model updates immediately re-render in the DOM via the $digest cycle and dirty checking.
What are directives in AngularJS?
Directives are special markers on DOM elements (such as attributes, element names, or CSS classes) that instruct AngularJS's HTML compiler ($compile) to attach specific behavior or transform the DOM. Key built-in directives include ng-app (bootstraps the application), ng-controller, ng-model (binds inputs to $scope), ng-repeat (iterates collections), and ng-show/ng-hide.
How does this in-browser AngularJS editor execute code?
The editor encapsulates your HTML markup, controller definition, and styles inside a real-time sandboxed preview pane that initializes the AngularJS runtime library. As you edit your controllers or templates, the preview recompiles and bootstraps your application automatically.
What is the difference between AngularJS (1.x) and modern Angular (v2+)?
AngularJS is based on JavaScript, $scope, controllers, and two-way dirty-checking. Modern Angular (v2 through v18+) is an entirely rewritten framework built with TypeScript, component hierarchies, unidirectional data flow, reactive RxJS signals, and ahead-of-time (AOT) compilation.
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