When to Use Controllers with AJAX Calls in ASP.NET MVC?

AJAX Calls to Controllers in ASP.NET MVC

When working with ASP.NET MVC, AJAX calls allow you to send data to and receive data from a server without reloading the entire page. Here's a detailed explanation of making a simple AJAX call to a controller:

Code Breakdown

Controller:

The controller contains the FirstAjax method, which returns JSON data (in this case, the string "chamara").

View:

• The HTML includes JavaScript that uses jQuery to make an AJAX POST call to the FirstAjax method.
• The successFunc function handles successful responses from the controller.

Problem

Initially, the AJAX call was not firing an alert because the data attribute was not removed. The controller did not expect any parameters, so removing the data solved the issue.

Modified Controller

In the updated controller, two FirstAjax methods were added to demonstrate both GET and POST scenarios. POST requires a parameter, but it is not used in this example.

Working AJAX Call

The final working AJAX call uses Razor syntax to dynamically generate the URL and removes the unnecessary data attribute:

$.ajax({
    type: "POST",
    url: '@Url.Action("FirstAjax", "AjaxTest")',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: successFunc,
    error: errorFunc
});

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