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AngularJS supports Single Page Application via multiple views on a single page. To do this, AngularJS has provided ng-view and ng-template directives, and $routeProvider services.

ng-view Directive

The ng-view directive simply creates a place holder where a corresponding view (HTML or ng-template view) can be placed based on the configuration.

Usage

Define a div with ng-view within the main module.

<div ng-app = "mainApp"> ... <div ng-view></div> </div>

ng-template Directive

The ng-template directive is used to create an HTML view using script tag. It contains id attribute which is used by $routeProvider to map a view with a controller.

Usage

Define a script block with type as ng-template within the main module.

<div ng-app = "mainApp"> ... <script type = "text/ng-template" id = "addStudent.htm"> <h2> Add Student </h2> {{message}} </script> </div>

$routeProvider Service

The $routeProvider is a key service which sets the configuration of URLs, maps them with the corresponding HTML page or ng-template, and attaches a controller with the same.

Usage 1

Define a script block with type as ng-template within the main module.

<div ng-app = "mainApp"> ... <script type = "text/ng-template" id = "addStudent.htm"> <h2> Add Student </h2> {{message}} </script> </div>

Usage 2

Define a script block with main module and set the routing configuration.

var mainApp = angular.module("mainApp", ['ngRoute']); mainApp.config(['$routeProvider', function($routeProvider) { $routeProvider .when('/addStudent', { templateUrl: 'addStudent.htm', controller: 'AddStudentController' }) .when('/viewStudents', { templateUrl: 'viewStudents.htm', controller: 'ViewStudentsController' }) .otherwise ({ redirectTo: '/addStudent' }); }]);

The following points are important to be considered in the above example −

  • $routeProvider is defined as a function under config of mainApp module using key as '$routeProvider'.

  • $routeProvider.when defines a URL "/addStudent", which is mapped to "addStudent.htm". addStudent.htm should be present in the same path as main HTML page. If the HTML page is not defined, then ng-template needs to be used with id="addStudent.htm". We used ng-template.

  • "otherwise" is used to set the default view.

  • "controller" is used to set the corresponding controller for the view.

Example

The following example shows the use of all the above-mentioned directives.

testAngularJS.htm

<html> <head> <title>Angular JS Views</title> <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script> <script src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular-route.min.js"> </script> </head> <body> <h2>AngularJS Sample Application</h2> <div ng-app = "mainApp"> <p><a href = "#addStudent">Add Student</a></p> <p><a href = "#viewStudents">View Students</a></p> <div ng-view></div> <script type = "text/ng-template" id = "addStudent.htm"> <h2> Add Student </h2> {{message}} </script> <script type = "text/ng-template" id = "viewStudents.htm"> <h2> View Students </h2> {{message}} </script> </div> <script> var mainApp = angular.module("mainApp", ['ngRoute']); mainApp.config(['$routeProvider', function($routeProvider) { $routeProvider .when('/addStudent', { templateUrl: 'addStudent.htm', controller: 'AddStudentController' }) .when('/viewStudents', { templateUrl: 'viewStudents.htm', controller: 'ViewStudentsController' }) .otherwise({ redirectTo: '/addStudent' }); }]); mainApp.controller('AddStudentController', function($scope) { $scope.message = "This page will be used to display add student form"; }); mainApp.controller('ViewStudentsController', function($scope) { $scope.message = "This page will be used to display all the students"; }); </script> </body> </html>

Output

Open the file testAngularJS.htm in a web browser and see the result.

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