jQuery Cross Domain Ajax

Question

My ajax code is

$.ajax({
    type: 'GET',
    dataType: "jsonp",
    processData: false,
    crossDomain: true,
    jsonp: false,
    url: "http://someotherdomain.com/service.svc",
    success: function (responseData, textStatus, jqXHR) {
        console.log("in");
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');
    }
});

This is a cross domain ajax request.

I am getting correct response for the request, while checking with firebug i can see that response.

This is the response I am getting in firebug response and while accessing this url through web browser

{"AuthenticateUserResult":"{\"PKPersonId\":1234,\"Salutation\":null,\"FirstName\":\"Miqdad\",\"LastName\":\"Kumar\",\"Designation\":null,\"Profile\":\"\",\"PhotoPath\":\"\/UploadFiles\/\"}"}

But I am getting error

SyntaxError: invalid label

{"AuthenticateUserResult":"{\"PKPersonId\":8970,\"Salutation\

Whether I need to use any other method to get it works. I want to implement this in phonegap+jquery mobile app.

Also, I don't have any access to the web service

If I disable chrome web security it's working fine

Answer 1

Looks like the inner JSON struct is passed along as a string. You'll have to JSON.parse() it once more to get that data as an object.

try {
  responseData = JSON.parse(responseData);
}
catch (e) {}

Edit: Try the following:

$.ajax({
    type: 'GET',
    dataType: "json",
    url: "http://someotherdomain.com/service.svc",
    success: function (responseData, textStatus, jqXHR) {
        console.log("in");
        var data = JSON.parse(responseData['AuthenticateUserResult']);
        console.log(data);
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');
    }
});

Answer 2

Unfortunately it seems that this web service returns JSON which contains another JSON - parsing contents of the inner JSON is successful. The solution is ugly but works for me. JSON.parse(...) tries to convert the entire string and fails. Assuming that you always get the answer starting with {"AuthenticateUserResult": and interesting data is after this, try:

$.ajax({
    type: 'GET',
    dataType: "text",
    crossDomain: true,
    url: "http://someotherdomain.com/service.svc",
    success: function (responseData, textStatus, jqXHR) {
        var authResult = JSON.parse(
            responseData.replace(
                '{"AuthenticateUserResult":"', ''
            ).replace('}"}', '}')
        );
        console.log("in");
    },
    error: function (responseData, textStatus, errorThrown) {
        alert('POST failed.');
    }
});

It is very important that dataType must be text to prevent auto-parsing of malformed JSON you are receiving from web service.

Basically, I'm wiping out the outer JSON by removing topmost braces and key AuthenticateUserResult along with leading and trailing quotation marks. The result is a well formed JSON, ready for parsing.