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jQuery.getJSON callback not executing

 
Rob Dennett
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posted 9 years ago
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I added the following code to my page.



I am getting the expected result from the server, namely a 200 status code, the mime type is application/json and the content is as expected. However, "test" isn't printing in the console. What gives?

Thanks,
Rob
 
Gregg Bolinger
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posted 9 years ago
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Are you sure your JSON response is well formed?
 
Rob Dennett
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The response is returning "true", which was working before. I cribbed it from some sample code in the jQuery tools validation docs.

Namely


Here we have used a simple return value true to indicate that the data was valid on the server-side.

 
Gregg Bolinger
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I don't think you understand my question. More than "true" needs to be returned in a properly formatted JSON response from the server. Otherwise, $.getJSON can't parse it which can result in the behavior you are seeing. If you can show us your complete (scrubbed if need be) response from the server, we can help you determine if it is formatted properly.
 
Gregg Bolinger
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Also note that if all you are returning from the server is "true", there is no need for $.getJSON. A simple $.get would suffice.
 
Bear Bibeault
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Newer versions of jQuery use more stringent JSON validation. Questionable JSON that might have worked before is not guaranteed to work now.

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Rob Dennett
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Ah, I upgraded from jQuery-1.4.4 to jQuery-1.5.1.

I also tried the following and am now getting an "Uncaught SyntaxError: Unexpected token :"

 
Gregg Bolinger
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I have no idea what the Gson API is. And as far as your problem goes, I don't think we care. Please show us the JSON that gets sent to the browser, not the code generating the JSON. If you are using Firefox, you should really be using Firebug. Otherwise, just log it in your servlet and copy and paste the results here.
 
Rob Dennett
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This is the response

{"foo":"bar"}
 
Bear Bibeault
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That should be fine.

Why the .getBytes()? I've never done that.

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Rob Dennett
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The getBytes was from an example I found that another developer had used. So if there is nothing wrong with the JSON, why am I getting "Uncaught SyntaxError: Unexpected token :" ? All my googling reveals is some stuff peculiar to JSONP responses from facebook and google.

Thanks,
Rob
 
Bear Bibeault
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I've never run into any problems using Gson in combination with response.getWriter().write(result).

Hmmm, grasping at straws... Have you actually looked at the response with Firebug or HttpFox?

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Rob Dennett
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Yes. In Firebug the response is

{"foo":"bar"}

I get the same thing in Chrome. (although the SyntaxError is from Chrome and the error is invalid label in FF).
 
Bear Bibeault
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Could you post a SCCE servlet and HTML file that demonstrates the issue? I'd like to run it locally.

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Rob Dennett
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here is the html code, but I have no idea what an SCCE servlet is

 
Bear Bibeault
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SCCE = simple self-contained example

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Rob Dennett
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I guess you mean something like this

 
Rob Dennett
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I forgot this import

import com.google.gson.Gson;
 
Bear Bibeault
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The script in your HTML has syntax errors.

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Bear Bibeault
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And what you probably didn't want to hear: after fixing your syntax error, your example worked perfectly for me.

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