Issue with Ajax not sending query string to ASP.NET controller

I am currently working with an Ajax function that serializes data sent from my view into a query string. Here is the code snippet:

UpdateFIConfig: function ($appForm) {

    var valid = $appForm.valid();
    //if not valid the validate plugin will take care of the errors
    if (valid) {

        $appForm.serialize();
        $.ajax({
            url: '/IdentifiConfig/DefaultConfiguration/UpdateFIConfig',
            data: $appForm,
            dataType: 'application/json',
            cache: false,
            type: 'POST',
            success: function (data) {
                if (data.Error) {
                    cc.jqUtils.openDialog(data.ErrorDescription, 'Error', 'OK', null, null, null);
                } else {
                    window.location.href = '/IdentifiConfig/DefaultConfiguration';
                }
            }
        });

    }
},

After serializing the data correctly and verifying it using console.log($appForm), the issue arises when trying to retrieve this serialized data in my controller function. The controller function snippet looks like this:

 [HttpPost]
 public ActionResult UpdateFIConfig(string query)
 {
     NameValueCollection nvc = HttpUtility.ParseQueryString(query);

     System.Diagnostics.Debug.WriteLine(nvc);
 }

However, I encounter a null pointer error on the line that attempts to parse the query string. I am unsure why this is happening and would appreciate any guidance or assistance on resolving this issue.

Answer №1

My project also uses AJAX, but with a slight difference - I do not use dataType. Instead, I use contentType: "application/json; charset=utf-8"

data: "{'query' : '" + $appForm + "'}"

Answer №2

Take a look at this snippet:

$appForm.serialize();

You might not realize it, but the serialize function actually returns a string that you are currently ignoring. In order to make use of this data, store it in a variable and pass it along like so:

var formData = $appForm.serialize();

$.ajax({
    url: '/IdentifiConfig/DefaultConfiguration/UpdateFIConfig',
    data: formData,
    /* etc */
});

Answer №3

To work around this inconvenience, I prefer accepting an Object with a string property rather than just a string. For example:

 [HttpPost]
 public ActionResult ModifyFIConfiguration(MyTypeWithQry query)
 { ...

Additionally,

    $.ajax({ url: '/IdentifiConfig/DefaultConfiguration/ModifyFIConfiguration',
             data: { 'query' : $appForm },
             dataType: 'application/json',
...

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