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

ng-view tag 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-template

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.

…

<h2> Add Student </h2>

</script>

</div>

$routeProvider

$routeProvider is the key service which set the configuration of urls, map them with the corresponding html page or ng-template, and attach a controller with the same.

Usage

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’

});

}]);

Following are the important points to be considered in above example.

$routeProvider is defined as a function under config of mainApp module using key as ‘$routeProvider’.
$routeProvider.when defines a url “/addStudent” which then is mapped to “addStudent.htm”. addStudent.htm should be present in the same path as main html page.If htm page is not defined then ng-template to be used with id=”addStudent.htm”. We’ve used ng-template.
“otherwise” is used to set the default view.
“controller” is used to set the corresponding controller for the view.

Example

Following example will showcase all the above mentioned directives.

testAngularJS.htm

<html>

<head>

<title>Angular JS Views</title>

</script>

</head>

<body>

<h2>AngularJS Sample Application</h2>

<p><a href = “#addStudent”>Add Student</a></p>

<p><a href = “#viewStudents”>View Students</a></p>

<h2> Add Student </h2>

</script>

<h2> View Students </h2>

</script>

</div>

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>

Result

Open textAngularJS.htm in a web browser. See the result.

AngularJS – Scopes

Scope is a special javascript object which plays the role of joining controller with the views. Scope contains the model data. In controllers, model data is accessed via $scope object.

var mainApp = angular.module(“mainApp”, []);

mainApp.controller(“shapeController”, function($scope) {

$scope.message = “In shape controller”;

$scope.type = “Shape”;

});

</script>

Following are the important points to be considered in above example.

$scope is passed as first argument to controller during its constructor definition.
$scope.message and $scope.type are the models which are to be used in the HTML page.
We’ve set values to models which will be reflected in the application module whose controller is shapeController.
We can define functions as well in $scope.

Scope Inheritance

Scope are controllers specific. If we defines nested controllers then child controller will inherit the scope of its parent controller.

var mainApp = angular.module(“mainApp”, []);

mainApp.controller(“shapeController”, function($scope) {

$scope.message = “In shape controller”;

$scope.type = “Shape”;

});

mainApp.controller(“circleController”, function($scope) {

$scope.message = “In circle controller”;

});

</script>

Following are the important points to be considered in above example.

We’ve set values to models in shapeController.
We’ve overridden message in child controller circleController. When “message” is used within module of controller circleController, the overridden message will be used.

Example

Following example will showcase all the above mentioned directives.

testAngularJS.htm

<html>

<head>

<title>Angular JS Forms</title>

</head>

<body>

<h2>AngularJS Sample Application</h2>

<p>{{message}} <br/> {{type}} </p>

<p>{{message}} <br/> {{type}} </p>

</div>

<p>{{message}} <br/> {{type}} </p>

</div>

</script>

var mainApp = angular.module(“mainApp”, []);

mainApp.controller(“shapeController”, function($scope) {

$scope.message = “In shape controller”;

$scope.type = “Shape”;

});

mainApp.controller(“circleController”, function($scope) {

$scope.message = “In circle controller”;

});

mainApp.controller(“squareController”, function($scope) {

$scope.message = “In square controller”;

$scope.type = “Square”;

});

</script>

</body>

</html>

Result

Open textAngularJS.htm in a web browser. See the result.

So, this brings us to the end of blog. This Tecklearn ‘How to create Single Page Application via multiple views’ blog helps you with commonly asked questions if you are looking out for a job in Angular JS and Front-End Development. If you wish to learn Angular JS and build a career in Front-End Development domain, then check out our interactive, Angular JS Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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Creating A Component Through Angular CLI
Ways to specify selectors
Template and styles
Installing bootstrap to design application
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Types of Data Binding
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Need of TypeScript
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Observables
RxJS Library
Angular’s Interaction with Backend
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Forms in Angular
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Various Types of Forms
What is Angular Validation and Model driven approach

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Angular Routing
Angular Routing benefits and features
Building a single page application and updating it dynamically with Angular Routing
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What is Authentication?
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Types of Authentication
Where to store tokens?
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Security threats in web application

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Testing services in Angular Framework
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