Constantly encountering errors instead of obtaining results with each AJAX call

I have a button on my webpage that triggers a JavaScript function I've created. I have successfully debugged into this function.

However, whenever the function reaches the AJAX part, it always returns with an error message alert.

I aim for the AJAX call to send my parameters to the Index method in the ResultsController.

var params =
    {
        state: "California",
        county: "Los Angeles County",
        city: "Los Angeles",
        lastname: "Doe", 
        firstname: "John"
    }
//^ Verified!  Params is populated successfully

$.ajax({
    url: '/Results/Index',
    data: JSON.stringify(params),
    contentType: 'application/json',
    type: 'POST',
    success: function () {
        if (data) {
            alert('life is good');
        }
    },
    complete: function () {
        // something
    },
    error: function () { alert('An error has occured. '); }
});

Below is the header of the controller method I am attempting to access (in the ResultsController)

public ActionResult Index(string state, string county, string city, string lastname, string firstname) 

Answer №1

The callback for success should always include the parameter data. Take a look at the example below:

success: function (data) {
    if (data) {
        alert('all is well');
    }
},

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