Introduction to AngularJS
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AngularJS is a JavaScript framework. It can be added to an HTML page using a <script> tag.
AngularJS throughdirectivesextends HTML attributes and usesExpressionsto bind data to HTML.
AngularJS is a JavaScript framework
AngularJS is a JavaScript framework written in JavaScript.
AngularJS is distributed in the form of JavaScript files and can be added to a web page using the script tag:
<script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script>
AngularJS extends HTML
AngularJS uses ng-directiveIt extends HTML.
ng-app The instruction defines an AngularJS application.
ng-model The instruction binds the value of HTML controls (input, select, textarea) to application data.
ng-bind The instruction binds application data to the HTML view.
AngularJS Examples
<!DOCTYPE html> <html> <script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script> <body> <div ng-app=""> <p>Name: <input type="text" ng-model="name"></p> <p ng-bind="name"></p> </div> </body> </html>
Example explanation:
AngularJS will automatically start when the web page is loaded.
ng-app tells AngularJS that the <div> element is an AngularJS Applicationof the 'owner'.
ng-model The instruction binds the value of the input field to the application variable. name.
ng-bind Directives bind the content of the <p> element to the application variable name.
AngularJS Directives
As you can see, AngularJS directives are with ng prefix HTML attributes.
ng-init Directives initialize AngularJS application variables.
AngularJS Examples
<div ng-app="" ng-init="firstName='Bill'"> <p>Name is <span ng-bind="firstName"></span></p> </div>
or use valid HTML:
AngularJS Examples
<div data-ng-app="" data-ng-init="firstName='Bill'"> <p>Name is <span data-ng-bind="firstName"></span></p> </div>
If you want the HTML page to be valid, you can use data-ng- instead of ng-.
You will learn more about directives later in this tutorial.
AngularJS Expressions
AngularJS expressions are written inside double curly braces:{{ expression }}.
AngularJS will "output" data at the location of the expression:
AngularJS Examples
<!DOCTYPE html>
<html>
<script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script>
<body>
<div ng-app="">
<p>My first expression: {{ 5 + 5 }}</p>
</div>
</body>
</html>
AngularJS expressions bind AngularJS data to HTML, similar to ng-bind In the same way as directives.
AngularJS Examples
<!DOCTYPE html>
<html>
<script src="https://cdn.staticfile.net/angular.js/1.6.9/angular.min.js"></script>
<body>
<div ng-app="">
<p>Name: <input type="text" ng-model="name"></p>
<p>{{name}}</p>
</div>
</body>
</html>
You will learn more about expressions later in this tutorial.
AngularJS Applications
AngularJS ModuleDefine AngularJS application.
AngularJS ControllerControl AngularJS application.
ng-app Directive defines an application,ng-controller Directive defines a controller.
AngularJS Examples
<div ng-app="myApp" ng-controller="myCtrl">
Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.firstName= "Bill";
$scope.lastName= "Gates";
});
</script>
AngularJS Modules define the application:
AngularJS Modules
var app = angular.module('myApp', []);
AngularJS Controllers control the application:
AngularJS Controllers
app.controller('myCtrl', function($scope) {
$scope.firstName= "Bill";
$scope.lastName= "Gates";
});
You will learn more about modules and controllers later in this tutorial.
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