The challenge of populating information within a Datalist

In my code snippet, I have a JavaScript function that is used to populate a Datalist:

function PopulateDropDown(facility) {
    $.ajax({
        url: '/Rentals/Base/GetContactsForFacility?selectedFacility=' + facility,
        data: { facility: facility },
        dataType: 'json',
        success: function (result) {
            response($.map(result, function (item) {

                $('#custServiceContactsSelection').append($("<option />").val(item.ContactName).text(item.ContactName));

            }));
        },

        cache: false,
        error: function (jqXHR, textStatus, errorThrown) {
            if (errorThrown.indexOf("Your session has timed out") != -1) {
                location.href = "/Rentals/Base/Timeout";
            }
        }
    });
}

Below is the method inside my controller for handling this request:

public ActionResult GetContactsForFacility(string selectedFacility)
{
    var facilityId = new Guid(selectedFacility);

    if (Request.IsAjaxRequest())
    {
        var contacts = SessionService.AllCustomerServiceContactsForFacility(CrmService, facilityId);

        return Json(contacts.Select(x => new { label = x.ContactName }), JsonRequestBehavior.AllowGet); 
    }
    return Content(string.Empty);
}

After running the above code, an error occurs in Visual Studio stating:

JavaScript runtime error: 'response' is undefined

I suspect something is missing in the GetDropDownData() function but I am unsure what exactly it could be. Can you provide some guidance on this issue? Thank you!

Answer №1

When making an AJAX request, be sure to update your code to the following:

success: function (responseData) {
            $.map(responseData, function (contact) {

                $('#custServiceContactsSelection').append($("<option></option>").val(contact.ContactName).text(contact.ContactName));

            });
        },
        // continue with the rest of your code

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