How to Properly Pass an Array of Objects to an MVC Controller Using jQuery Ajax?

Using jQuery Ajax to Send an Array of Objects to an MVC Controller

When sending an array of objects to an MVC controller using jQuery's ajax() method, the controller's parameter might receive a null value. This article outlines the solution.

Troubleshooting the Null Value

The problem typically stems from incorrect data serialization and content type handling. Here's how to fix it:

1. Setting Content Type and Data Type:

   The ajax() function requires explicit contentType and dataType settings:

   contentType: 'application/json; charset=utf-8',
   dataType: 'json',

2. JSON Serialization:

   The array of objects must be serialized into JSON format using JSON.stringify(). Structure the data like this:

   things = JSON.stringify({ things: things });

Illustrative Example

This example demonstrates how to successfully pass an array of objects:

$(document).ready(function() {
    const things = [
        { id: 1, color: 'yellow' },
        { id: 2, color: 'blue' },
        { id: 3, color: 'red' }
    ];

    const data = JSON.stringify({ things: things });

    $.ajax({
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        type: 'POST',
        url: '/Home/PassThings',
        data: data,
        success: function() {
            $('#result').html('"PassThings()" successfully executed.');
        },
        error: function(response) {
            $('#result').html(response.responseText); // Display error details
        }
    });
});

Corresponding Controller Method (C# Example):

public void PassThings(List<Thing> things)
{
    // Process the 'things' list here
}

Remember to replace /Home/PassThings with your actual controller and action. Using error instead of failure provides more informative error handling. This revised approach ensures proper data transmission and prevents the null value issue.

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