Please provide a test case demonstrating this issue. Also, please paste the server’s JSON response including headers.

I'm sorry but I can't seem to get fiddler to work with /echo/json so I can't provide an example right now. I've tested on my server and below are the server response.

jQuery Error: "Uncaught SyntaxError: Unexpected token :"

Response Headers:

Cache-Control:private

Content-Length:53

Content-Type:application/json; charset=utf-8

Date:Thu, 17 Feb 2011 18:05:10 GMT

Server:Microsoft-IIS/7.5

X-AspNet-Version:2.0.50727

X-AspNetMvc-Version:2.0

X-Powered-By:ASP.NET

Response Content

{"result":"OK","message":"Criado evento com o ID 85"}

On more note: I've found out this was happening because both fullcalendar plugin and jquery.form plugin were giving the same error.

I’m not able to reproduce this issue. test case

Im having the same problem, i get parse error and the only way around this is putting dataType="text json"

I get parse error and jQuery15108338082315804084_1298857654378 was not called

Replying to [comment:6 anonymous]:

Im having the same problem, i get parse error and the only way around this is putting dataType="text json" I get parse error and jQuery15108338082315804084_1298857654378 was not called

Nevermind apparently the problem is caused by the validator plugin which is not compatible with version 1.5

I also receive this error, and I revert back to 1.4.4 and re-test, it works fine. Error is:

XHR finished loading: "http://localhost:8882/forms/ajax/validate-captcha?callback=jQuery151036387112317606807_1299043692429".

jquery-1.5.1.min.js:16Uncaught SyntaxError: Unexpected token :

I have a validate-captcha json test and it returns a boolean, however doesn't appear to work for me in 1.5.1.

Have to revert to 1.4.4 for now.

grahamoneale, this ticket is closed. Can you reproduce the bug with fiddle?

I think the problem is with .NET JsonResult.

When I opened the ticket I was using ASP.NET MVC, are you using ASP.NET MVC too?

I believe that the JsonResult returned by microsoft mvc returns something different than what jquery is expecting.

I'm getting the same error - previously worked with jquery-1.4.1. When I change the dataType to "text json", I then get the error "No Transport"

I have same problem.

The difference between test case and case of the issue is content type.

Test case:

Content-Type: application/json

Buggy case:

Content-Type: application/json; charset=utf-8

When using dataType 'text json', it works.

Hi,

I have the same problem, on IE8 works fine with dataType:"text json" but do not works on FireFox 4RC and Chrome 10 (JSON.parse Error).

I solve it removing some special chars from json data that my server page returns. For example, json data like that:

{"htmlData":"

<table>

<tr>

<td></td>

</tr>

</table>"

}

I have to remove the tabs and spaces of the html format.

Replying to [comment:11 igor@…]:

I have same problem. The difference between test case and case of the issue is content type. Test case: Content-Type: application/json Buggy case: Content-Type: application/json; charset=utf-8 When using dataType 'text json', it works.

Using dataType 'text json' seems to have fixed it for me on IE and Chrome.

Reproduced. Here's what I can figure out:

Alots changed with how datatypes are handled with the new jQuery. The bug, i think, is evidenced by this:

For an ajax request:

• jquery 151, datatype: json:

-- Accept:text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01

• jquery 144, datatype: json:

-- Accept:application/json, text/javascript, */*; q=0.01

Setting the data type to text json gives an identical accept header to simply text, disabling the automatic processing:

• Accept:text/html, */*; q=0.01

I figure this change isin't intentional, as it breaks the rails respond_with method completely. From what I can tell from the source, dataTypes is an array ['script', 'json'], and only dataTypes[0] is being used to generate the header. The 'script' is added to the array in this line (6651 about):

s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );

But what's going on there, I can't tell. I tried to do a test, by putting immediately after:

• s.dataTypes[0] = 'json';

But the array remained logged as: ['script', 'json']

I tried instead

• s.dataTypes[0] = 'json!';

And it now displayed as one would expect ['json!']

Well, I'm stumped.

or maybe this has already been solved. Whoops.

[rails] http://stackoverflow.com/questions/4955582/jquery-1-5-and-new-text-json-datatype

I solved using "text json" and eval with result

success: function(result){

var resultProcess = eval(result);

...

}