I'm having trouble sending the XML data through AJAX to an MVC controller - it doesn't seem to be arriving. What could

Currently, I am facing an issue while attempting to send an XML string from the client side in HTML/JavaScript to the ASP.NET MVC server side. Interestingly, when sending a regular "non-XML" string, the transfer is successful.

Here is the relevant JavaScript code on the client side:

function TransferXmlDataToServer() {
    var sXml = "<Tag>This is an XML test string.</Tag>"
    $.ajax({
        type: "POST",
        url: '@Url.Action("TransferXMLData", "Home")',
        data: { sInputXml: sXml },                             
        dataType: "json",
        success: function(sReturnValue) {
            alert("Value returned from server is: " + sReturnValue);
        },
        error: function() {
            alert("There was an error on the server side");
        }
    })
};

The corresponding function in the MVC Home controller on the server side looks like this:

public JsonResult TransferXMLData(string sInputXml) {
    // The arguments' name must match those used in the View's Ajax call
    return Json("Success");
}

When invoking TransferXmlDataToServer from the client side, the message There was an error on the server side is displayed. Debugging print statements within TransferXMLData server-side are not triggered, indicating that the function is not being accessed.

Interestingly, switching the XML string:

sXml = "<Tag>This is an XML test string.</Tag>"
with:
sXml = "This is a test string."
results in everything working as expected.

Some additional points:

  • This problem occurred in testing with IE11 and Edge browsers.
  • I also attempted converting the XML string to Serialized JSON before transmission, but encountered the same issue.

Your insights and guidance would be greatly appreciated. Thank you.

Answer №1

The reason for this is that ASP.NET has a default protection mechanism in place to prevent HTML mark-up from being sent un-encoded to a controller action. To allow such content to pass through, you can use the ValidateInputAttribute by decorating your action with it:

[ValidateInput(false)]
public JsonResult ProcessXMLData(string inputXml) 
{
    // Ensure that the argument names match those specified in the Ajax call from the View
    return Json("Operation successful");
}

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