Passing Multiple Types of Data via AJAX to MVC C# Controller

Learn how to send an array and a string from your Razor View to a C# MVC controller using `AJAX`, with clear examples and explanations.
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This video is based on the question https://stackoverflow.com/q/71969704/ asked by the user 'Daniel Lima Fortes' ( https://stackoverflow.com/u/13124127/ ) and on the answer https://stackoverflow.com/a/71974334/ provided by the user 'kblau' ( https://stackoverflow.com/u/5547573/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Passing Multiple Types of Data via AJAX to MVC C# Controller

In modern web applications, it’s common to communicate with the server using AJAX (Asynchronous JavaScript and XML). This practice allows developers to send and retrieve data without refreshing the entire page, thus creating a smoother user experience. However, when you want to send different types of data together, such as arrays and strings, it can become a bit tricky. In this guide, we will explore how to effectively pass multiple types of data from an AJAX call to your MVC C# controller.

Understanding the Problem

In a typical scenario, you might need to gather user input from a webpage and send that to your server. For instance, let’s consider a situation where you need to send both a string (like an ID) and an array (like multiple selected options) to your MVC controller. You might encounter challenges when attempting to structure your data properly for transmission. The core question is:

How can you send two different types of data (like a string and an array) from JavaScript using AJAX to a C# MVC Controller?

The Solution

The good news is that it is possible and can be done by following the structure outlined below. Let’s break it down into clear sections for better understanding.

Step 1: Define Your MVC Controller Method

You need to define a method in your controller that is capable of accepting both types of data. Here’s how you can set it up:

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

Step 2: Prepare Your View with AJAX Call

In your Razor View, you’ll need to set up a button that triggers the AJAX call and collects the required data. Here’s a simple front-end code example:

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

Explanation of the Code

Controller Method: The Index900 method is decorated with [HttpPost], meaning it responds to POST requests. It takes a string (theValue) and an array of strings (stringArray).

JavaScript: When the button is clicked, it collects the ID key and the array of selected values. This data is sent as a JSON object to the server with proper content-type.

AJAX Call: Utilizing JSON.stringify(), the data is formatted correctly before being sent to the controller.

Conclusion

With the above steps, you can successfully pass both string and array data from your Razor view to an MVC C# controller using AJAX. This allows for greater flexibility in how you gather and process user input on your web applications. Feel free to modify the examples to suit your specific needs, and happy coding!

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