Скачать или смотреть How to Send Multiple Model Objects with AJAX in ASP.NET MVC

A comprehensive guide on passing complex model objects using AJAX in ASP.NET MVC effectively. Learn about AJAX requests, and why you should use POST instead of GET.
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How to Send Multiple Model Objects with AJAX in ASP.NET MVC

In the world of web development, working with multiple model objects can be quite challenging, especially when handling form submissions or data retrieval. Developers often find themselves asking: How can I effectively pass multiple model objects using AJAX in ASP.NET MVC?

In this guide, we will tackle this question and provide a clear, structured solution to ensure you can seamlessly pass complex data structures to your controller.

Understanding the Problem

When using AJAX to send data to a controller in ASP.NET MVC, it’s important to understand how data is serialized and transmitted. In the provided code, the developer tried to send input data structured as model objects, but faced issues with null values in their controller action. The key problem stems from the use of the GET request method.

Why POST Instead of GET?

Limitations of GET

When you use a GET request to transmit data, here’s what happens:

The parameters are appended to the URL query string.

If you have complex objects (like nested models), the serialization process can lead to loss of data.

For example, an object represented in the URL may be transformed into an array-like structure, which the receiving end cannot parse correctly.

Advantages of POST

Switching to a POST request has several advantages:

Handles Complex Data: A POST request allows for complex objects to be serialized correctly.

No URL Limitations: Since data is sent in the request body, there are no size limitations imposed by the URL length.

Step-by-Step Solution

Let's rewrite your AJAX code using POST while ensuring the data is transmitted correctly.

Example AJAX Code

Here's how your AJAX function should look:

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

Adjusting the Controller

Ensure your controller action can properly receive the POST data. It should look something like this:

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

Conclusion

In summary, when passing multiple model objects via AJAX in ASP.NET MVC, always prefer using a POST request. This adjustment simplifies the serialization of complex data structures and ensures that your controller receives the information correctly.

Key Points to Remember:

Use POST for complex data: It allows for better handling of nested models.

Serialize your data: Use JSON.stringify to format your data properly before sending.

Check your action method's attributes: Ensure proper HTTP method usage in your controller actions.

By following these guidelines, you’ll enhance your AJAX functionality and improve the robustness of your application’s data handling.