How to Make Successful AJAX Calls to ASP.NET MVC Controllers?

Making AJAX calls in ASP.NET MVC

Performing an AJAX call in ASP.NET MVC refers to the web page making a request to a controller method without a complete page refresh. This enables local updates and improves the user experience.

In this case, the AJAX call in the view is intended to retrieve data from the controller method FirstAjax and display it in the alert box.

Original code issue:

There is a small problem with the original JavaScript function. Since no data is sent to the server, the data attribute is unnecessary. This problem can be solved by removing the data attribute.

Modified code:

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

Razor syntax and @Url.Action:

In ASP.NET MVC, it is recommended to use Razor syntax and @Url.Action to build URLs for AJAX calls. This approach ensures that the URL is generated correctly based on the routing configuration.

POST request and parameters (updated):

To handle POST requests with parameters, you can add an extra parameter to the controller method. In the updated code, the parameter a has been added to the FirstAjax method and the [HttpPost] attribute is used. Then modify the JavaScript function to include the data attribute and send the parameters.

With these adjustments, the AJAX call should be able to execute successfully and display the value returned by the controller method in the alert box.

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