problem with jquery post request

[Pawan Arora]

Hi, I don't know the reason of getting blank data in alert box, whenever I do the post request to servlets from jquery after clicking login button.

Here's the code which's making me bugged:

$.post("Check.do", $('#form').serialize(),
       function(data){
         alert(data); 
       
       });
    } 

the request is passing to servlets(which is mapped to Check.do URL), and in doPost method in servlets I'm just doing:

response.setContentType("text/html");
   PrintWriter out = response.getWriter();
     out.println("HELLO");
     out.flush();
     out.close();

May I know what's the reason of getting an error in above code, and how can I sort this problem out?

[Bear Bibeault]

Have you used a tool such as Firebug to verify that the response is returning the value that you expect?

[Pawan Arora]

I'm alreay using it, and I'm not getting any error, but alert box still displaying blank output.

[Eric Pascarello]

Do you see the form parameters being sent up with Firebug or Fiddler?

Eric

[Pawan Arora]

Hi, if I set async to false with post request in $.ajax(options) method, I can get the output as "HELLO" in alert dialog box. otherwise I'm getting the status code as "0" with no data in response. May I know why?

[Eric Pascarello]

Status 0 normally means you are running on a protocol other than http.

[Pawan Arora]

But I'm sending request from JSP page to servlets, which has extended HttpServlet class, so how that request couldn't be on http protocol?

[Eric Pascarello]

Other cause is you are not canceling the default action of the form and the page is submitting. return false on your button/image clicks.

Eric