Angilar Js
AngularJS
You Should Already Know:
- HTML
- CSS
- JavaScript
AngularJS is a JavaScript framework. It can be added to an HTML page with a <script> tag
.AngularJS extends HTML attributes with Directives, and binds data to HTML with Expressions.
.AngularJS extends HTML attributes with Directives, and binds data to HTML with Expressions.
AngularJS is a JavaScript framework written in JavaScript.AngularJS is distributed as a JavaScript file, and can be added to a web page with a script tag.
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Data binding is a very useful and powerful feature used in software development technologies. It acts as a bridge between the view and business logic of the application.
AngularJS follows Two-Way data binding model.
<!DOCTYPE html> <html> <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script> <body> <div ng-app="" ng-init="firstName='Ajeet'"> <p>Input something in the input box:</p> <p>Name: <input type="text" ng-model="firstName"></p> <p>You wrote: {{ firstName }}</p> </div> </body> </html> |
AngularJS extends HTML with ng-directives:
- The ng-app directive defines an AngularJS application.
- The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.
- The ng-bind directive binds application data to the HTML view.
Eg:
<!DOCTYPE html>
<html>
<script src="https://ajax/libs/angularjs/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>
<!DOCTYPE html>
<html>
<script src="https://ajax/libs/angularjs/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>
AngularJS starts automatically when the web page has loaded:
- The ng-app directive tells AngularJS that the <div> element is the "owner" of an AngularJS application.
- The ng-model directive binds the value of the input field to the application variable name.
- The ng-bind directive binds the content of the <p> element to the application variable name.
AngularJS Expressions:
In AngularJS, expressions are used to bind application data to HTML. AngularJS resolves the expression, and return the result exactly where the expression is written.Expressions are written inside double braces {{expression}}.They can also be written inside a directive.
{{ 5 + 5 }} or {{ firstName + " " + lastName }}
Eg:
<!DOCTYPE html> <html> <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script> <body> <div ng-app> <p>A simple expression example: {{ 5 + 5 }}</p> </div> </body> </html>
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