AngularJS Application

Now is the time to create a real AngularJS single page web application (SPA).

AngularJS Application Example

You have learned enough about AngularJS, and now you can start creating your first AngularJS application:

My Notes



Remaining characters:100


Application Explanation

AngularJS Examples

<html ng-app="myNoteApp">
<head>
<meta charset="utf-8">
<script src="https://cdn.staticfile.net/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>

<div ng-controller="myNoteCtrl">

<h2>My Notes</h2>

<p><textarea ng-model="message" cols="40" rows="10"></textarea></p>

<p>
<button ng-click="save()">Save</button>
<button ng-click="clear()">Clear</button>
</p>

<p>Number of characters left: <span ng-bind="left()"></span></p>

</div>

<script src="myNoteApp.js"></script>
<script src="myNoteCtrl.js"></script>

</body>
</html>

Try it Yourself »

The application file "myNoteApp.js":

var app = angular.module("myNoteApp", []);

The controller file "myNoteCtrl.js":

app.controller("myNoteCtrl", function($scope) {
    $scope.message = "";
    $scope.left  = function() {return 100 - $scope.message.length;};
    $scope.clear = function() {$scope.message = "";};
    $scope.save  = function() {alert("Note Saved");};
});

<html> element is the AngularJS application: ng-app="myNoteApp" 's container:

<html ng-app="myNoteApp">

The <div> element is the controller in the HTML page: ng-controller="myNoteCtrl" 's scope:

<div ng-controller="myNoteCtrl">

ng-modelThe directive binds the <textarea> to the controller variable message:

<textarea ng-model="message" cols="40" rows="10"></textarea>

Twong-clickEvents invoke controller functionsclear()andsave():

<button ng-click="save()">Save</button>
<button ng-click="clear()">Clear</button>

ng-bindDirectives bind controller functionsleft()to <span>, used to display the remaining characters:

Number of characters left: <span ng-bind="left()"></span>

The application library file needs to be executed after AngularJS is loaded:

<script src="myNoteApp.js"></script>
<script src="myNoteCtrl.js"></script>

AngularJS application architecture

The above example is a complete AngularJS single page web application (SPA).

The <html> element contains the AngularJS application (ng-app=)。

The <div> element defines the scope of the AngularJS controller (ng-controller=)。

An application can have many controllers.

Application file(my...App.js) defines the application model code.

One or more controller files (my...Ctrl.js) defines the controller code.

Summary - How does it work?

The ng-app directive is placed at the root element of the application.

For a single page web application (SPA), the root of the application is typically the <html> element.

One or more ng-controller directives define the controllers of the application. Each controller has its own scope: : the defined HTML element.

AngularJS starts automatically on the HTML DOMContentLoaded event. If the ng-app directive is found, AngularJS loads the module specified in the directive and compiles the application with ng-app as its root.

The root of an application can be the entire page, or a small part of the page; if it is a small part, it will compile and execute faster.

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