jquery Ajax Request SyntaxError: Unexpected token <

Question

I am trying to return an array of products using a get request. The response returns XML with a 200 request.

Web Service:

[WebMethod]
[ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public List<product> GetAllProducts()
{
    using (SchulteDesignYourOwnEntities db = new SchulteDesignYourOwnEntities())
    {
        return db.products.ToList();
    }
}

Here is my code:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

    <head>
        <title></title>
        <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.3.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function () {

                $.ajax({
                    url: 'http://www.organizeliving.com/designwebservice.asmx/GetAllProducts',
                    dataType: 'json',
                    success: function (result) {
                        alert("Result: " + result.length);
                    },
                    error: function (xhr, ajaxOptions, thrownError) {
                        console.log("Status: " + xhr.status);
                        console.log("Message: " + thrownError);
                    }
                });


            });
        </script>
    </head>

    <body></body>

</html>

check whether any of the string properties in returned product list contains < character — droidbot
– droidbot, Commented Dec 5, 2012 at 15:31
It does. My problem appears that I cannot return json from my .asmx web service. My response is Soap/ XML. — Joseph Anderson
– Joseph Anderson, Commented Dec 5, 2012 at 15:32

Explosion Pills · Accepted Answer · 2012-12-05 15:32:25Z

15

You have the dataType as 'json'. jQuery will automatically try to parse JSON from the response. If it cannot, it considers it an error.

XML is not valid JSON (it will really hate the opening <). You can either change the dataType to 'xml' (or nothing) or actually emit pure JSON from the server instead.

answered Dec 5, 2012 at 15:32

Explosion Pills

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2 Comments

Joseph Anderson Over a year ago

It succeeds, however, my method says result is undefined. It appears it never parses the data.

droidbot Over a year ago

It says undefined because result is a JSON object, not a string. Either use $.param(result).length or use your own JSON serialiser.

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