Re: Problem trying to use JSNI to eval() a JSON string

[Glenn Simon]

I finally figured this out (a while ago) and thought I would post the
solution in case anybody else has the same problem.  It turns out I
needed to add an inherit line to my .gwt.xml file, as follows:

  
  

By doing that it made the JSONParser and related classes available on
the client side.  I couldn't find that documented anywhere, but
stumbled upon it on my own.

Happy Apping!
Glenn

On Jan 17, 1:03 am, Glenn Simon  wrote:
> Thanks for trying to help, guys, but after modifying and checking the
> string with JsonUtils, trying com.google.gwt.json.client.JSONParser
> (tells me the code is unavailable and fails to load my app), and
> reading Google docs 'til my eyes hurt I can't for the life of me
> figure out how to make JSON work in my app.  I know I'm doing
> something wrong but I can't figure out what it is.  I just want a way
> of getting some formatted string data from the server to the client in
> push mode using the Channel.  I can get what looks like a JSON string
> to the client in push mode, but can't find any tools that work to help
> me parse the JSON string once it is at the client.  I'll try switching
> to XML.

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Need help with how to handle system events like the system sleeping/waking

[Glenn Simon]

I have written an app that works fine, but when the user PC sleeps due
to power settings and the channel times out, I have to refresh the
browser to restart the app.  I would like to find a handler that will
do something just before the system sleeps and do something else as
the system wakes up again.  I'm looking for a window or browser
handler with onSleep() and onWake() methods or something like that.
Anybody know where I can find it?

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Re: Problem trying to use JSNI to eval() a JSON string

[Glenn Simon]

Thanks for trying to help, guys, but after modifying and checking the
string with JsonUtils, trying com.google.gwt.json.client.JSONParser
(tells me the code is unavailable and fails to load my app), and
reading Google docs 'til my eyes hurt I can't for the life of me
figure out how to make JSON work in my app.  I know I'm doing
something wrong but I can't figure out what it is.  I just want a way
of getting some formatted string data from the server to the client in
push mode using the Channel.  I can get what looks like a JSON string
to the client in push mode, but can't find any tools that work to help
me parse the JSON string once it is at the client.  I'll try switching
to XML.

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Re: Problem trying to use JSNI to eval() a JSON string

[Glenn Simon]

Yeah, that makes sense.  And this is only client side anyway.  But I
have tried with and without the Serializable implementation and get
the same result.  Do I somehow need to convert the string to a JSON
object before passing it to eval()?

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Problem trying to use JSNI to eval() a JSON string

[Glenn Simon]

Here is some of my code:

public abstract class Message extends JavaScriptObject implements
Serializable { // does it need to be serializable?
protected Message() {}
public final native String getType() /*-{ return this.type; }-*/;
public final native Long getTimeLeft() /*-{ return this.timeleft; }-
*/;
}

public static native Message parseJson(String jsonStr) /*-{
return eval(jsonStr);
}-*/;

String myString = "{ \"type\" : \"complete\", \"timeleft\" : -5000 }";

Message message = parseJson(myString);

Window.alert("type: " + message.getType());

During the parseJson call, I get kicked into MethodDispatch.class when
an exception is caught:

} catch (InvocationTargetException e) {
  // If we get here, it means an exception is being thrown from
  // Java back into JavaScript
  wrapException(returnValue, e.getTargetException());
  return true;
}

I have read the docs numerous times, and can't figure out what I am
doing wrong.  Can anyone help me?  Thanks in advance.

Glenn

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