ASP.NET MVC 2: jQuery post string is null?

Question

I'm not sure what's the issue, but I'm constructing a string and trying to pass it to my Controller Action. But when the action is executed, the data is null.

JavaScript:

var xml = "<Request><ZipCode>92612</ZipCode></Request>";

$.ajax({
    url: "/Home/GetXml",
    contentType: 'application/text; charset=utf-8',
    data: xml,
    success: function (result) { success(result); },
    type: "POST",
    datatype: "text"
});

Controller:

[HttpPost]
public ActionResult GetXml(string data)
{
    if (!String.IsNullOrEmpty(data))
    {    
        return View("Index", data);
    }

    return View("Index");
}

If I set a breakpoint on the if, the "data" is null. What gives?

Community · Accepted Answer · 2017-05-23 12:31:26Z

2

The answer: don't use contentType

Thanks to this question and answer: Asp.Net Mvc JQuery ajax input parameters are null

edited May 23, 2017 at 12:31

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answered Dec 15, 2010 at 17:46

dcolumbus

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5 Comments

Nathan Taylor Over a year ago

I was just about to post that solution after having fiddled with the code in Visual Studio. I'm glad you got it. You'll probably also notice that you're going to need to disable request validation for the GetXml action. ASP.NET will flip a hoo-hah if you try send it a request containing raw XML.

dcolumbus Over a year ago

Disable request validation? What I'm noticing is that my ajax request is giving me a success, but none of my breakpoints within the controller action are being executed. Tells me that I'm not actually getting to the action...

Lorenzo Over a year ago

If you dont disable request validation I suspect that the request is handled at an higher level and rejected from the MVC framework with maybe an HTTP 500 error

dcolumbus Over a year ago

@Nathan, there's obviously a problem with sending raw XML to the controller. What would be my alternative?

Nathan Taylor Over a year ago

As I said, disable request validation. Above the GetXml action definition add [ValidateInput(false)].

Lorenzo · Accepted Answer · 2010-12-15 17:50:58Z

1

try with

$.ajax({
    url: "/Home/GetXml",
    contentType: 'application/text; charset=utf-8',
    data: { data: xml },
    success: function (result) { success(result); },
    type: "POST",
    datatype: "text"
});

edited Dec 15, 2010 at 17:50

answered Dec 15, 2010 at 17:24

Lorenzo

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10 Comments

Nathan Taylor Over a year ago

He's passing a text dataType, not JSON. This will change the parameters of the request.

dcolumbus Over a year ago

No matter what I do, the data is always null. I've tried using both post and ajax. No difference.

Lorenzo Over a year ago

@dcolumbus: I have edited my answer. I wrote so fast and forgot to add the variable name. The default ModelBinder will do the job

dcolumbus Over a year ago

@Lorenzo, any idea why I might be getting a success but my controller action isn't actually being executed?

Lorenzo Over a year ago

@dcolumbus: you mean that the request will succeed but you are not able to debug in the code? You can try using Fiddler and see what's going on with the request/response

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