How to Call Controller Function from JavaScript in ASP.NET Core and Redirect Securely

Discover how to securely call a controller function from JavaScript in ASP.NET Core and handle redirection efficiently. Learn step-by-step for smooth implementation.
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How to Call Controller Function from JavaScript in ASP.NET Core and Redirect Securely

In the world of ASP.NET Core MVC, there's often a need to pass data between JavaScript and your server-side C- controller. This challenge commonly arises when you want your JavaScript to call a controller function, passing data and ensuring a redirect happens afterward. If you're struggling with this issue, you're not alone!

The Problem

A user expressed their frustration while trying to call a controller function from JavaScript to handle a list and redirect after that. They already had a basic implementation but it wasn’t secure enough for their requirements. The limitations of using AJAX calls, which do not support redirection directly, added to their dilemma. They sought a solution that could bridge the gap between JavaScript functionality and server-side redirection securely.

Understanding the Solution

The good news is that a simple yet effective solution exists! The following sections will break down the steps to achieve calling a controller function from JavaScript along with a proper redirect mechanism.

Step 1: JavaScript to Handle Button Click

The first part of the solution revolves around triggering the function with a button click. Here's how that looks in code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

When the button with the ID btn is clicked, the array PostData contains the data you want to send.

The if statement checks if there's any data to process. If yes, it constructs the URL for the controller function, passing the array as a query parameter.

Otherwise, it alerts the user to indicate that no data was found.

Step 2: C- Controller Function

The next part of the implementation is in the controller where you'll receive the data and handle the redirect. Here’s how that function looks:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

This controller method, Test, accepts the data passed as a query string.

It utilizes RedirectToAction to navigate to the desired controller function while passing the received data along with it.

Conclusion

By following the outlined steps, you create a seamless interaction between your JavaScript front-end and your ASP.NET Core controller with a smooth redirect mechanism. This solution not only meets the requirement for passing data but does so in a secure manner compared to a direct AJAX call that lacks redirection capabilities.

Now you're all set to implement this process in your own ASP.NET Core application. Happy coding!