In this article I will explain with an example, how to use AngularJS, AJAX and JSON in ASP.Net Core 5.
This article will illustrate how to call Controller’s Action method using AngularJS $http service from View in ASP.Net Core 5.
Note: For beginners in ASP.Net Core 5, please refer my article ASP.Net Core 5: Hello World Tutorial with Sample Program example.
 
 

Configuring the JSON Serializer setting

In order to configure the JSON Serializer settings in ASP.Net Core 5, please refer my article ASP.Net Core 5: Changing the default Camel Case JSON Output.
 
 

Model

The Model class consists of following properties.
public class PersonModel
{
    ///<summary>
    /// Gets or sets Name.
    ///</summary>
    public string Name { get; set; }
 
    ///<summary>
    /// Gets or sets DateTime.
    ///</summary>
    public string DateTime { get; set; }
}
 
 

Controller

The Controller consists of following Action methods.

Action method for handling GET operation

Inside this Action method, simply the View is returned.
 

Action method for handling POST operation for AngularJS AJAX operation

This Action method handles the AJAX call made from the AngularJS $http service in the View.
The object of PersonModel class is received as parameter and the Name property holds the value of the TextBox sent from the View.
Note: The FromBody attribute is used for model-binding the data sent from AngularJS $http service.
 
Finally, the Current DateTime of the Server is set into the DateTime property and the PersonModel class object is returned to the View in JSON format.
public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public IActionResult AjaxMethod([FromBody] PersonModel person)
    {
        person.DateTime = DateTime.Now.ToString();
        return Json(person);
    }
}
 
 

View

Inside the View, the following script file is inherited.
1. angular.min.js
The View consists of an HTML DIV to which ng-app and ng-controller AngularJS directives have been assigned.
Note: If you want to learn more about these directives, please refer my article Introduction to AngularJS.
 
The HTML DIV consists of an HTML TextBox and a Button. The Button has been assigned with AngularJS ng-click directive.
Note: If you want to learn more about ng-click directive, please refer my article AngularJS: Implement Button click event using ng-click directive example.
 
When the Button is clicked, the ButtonClick function is executed.
Inside the ButtonClick function, the $http service is used to make an AJAX call to the Controller’s Action method. The $http service has following properties and events.

Properties

1. method – The method type of HTTP Request i.e. GET or POST.
2. url – URL of the Controller’s Action method.
3. datatype – The format of the data i.e. XML or JSON.
4. data – The parameters to be sent to the Controller’s Action method.
5. headers – List of headers to be specified for the HTTP Request.
 

Event Handlers

1. success – This event handler is triggered once the AJAX call is successfully executed.
2. error – This event handler is triggered when the AJAX call encounters an error.
The response from the AJAX call is received in JSON format inside the Success event handler of the $http service and the result is displayed using JavaScript Alert Message Box.
Note: If you want to learn more on displaying JavaScript alert with AngularJS, please refer my article AngularJS: Display (Show) JavaScript Alert Box.
 
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.9/angular.min.js"></script>
    <script type="text/javascript">
        var app = angular.module('MyApp', [])
        app.controller('MyController', function ($scope, $http, $window) {
            $scope.ButtonClick = function () {
                var post = $http({
                    method: "POST",
                    url: "/Home/AjaxMethod",
                    dataType: 'json',
                    data: { name: $scope.Name },
                    headers: { "Content-Type": "application/json" }
                });
 
                post.success(function (data, status) {
                    $window.alert("Hello: " + data.Name + ".\nCurrent Date and Time: " + data.DateTime);
                });
 
                post.error(function (data, status) {
                    $window.alert(data.Message);
                });
            }
        });
    </script>
    <div ng-app="MyApp" ng-controller="MyController">
        <input type="text" ng-model="Name" />
        <input type="button" value="Get Current Time" ng-click="ButtonClick()" />
    </div>
</body>
</html>
 
 

Screenshot

.Net Core 5: AJAX using AngularJS in ASP.Net
 
 

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