Re: GWT native to long conversion

Thanks!

суббота, 1 августа 2015 г., 18:07:56 UTC-4 пользователь Alberto Mancini написал:

Hello,

in your example you are returning  id (a numeric value) as a string ant this is the origin of the unexpected behavior.

Indeed this works

public final native String  _getIdString()/*-{ return ''+this.id; }-*/;

as well as returning a java numeric value:

public final native int  _getIdInt()/*-{ return this.id; }-*/;

(see http://www.gwtproject.org/doc/latest/DevGuideCodingBasicsJSNI.html#passing-javascript for details)

Anyway, in general, is probably not a good idea to use Long for a numeric 'native'  value  

because in js you cannot represent a long number (see f.e. http://stackoverflow.com/questions/17320706/javascript-long-integer).

Hope it helps.

    

      Alberto. 

On Sat, Aug 1, 2015 at 3:38 PM Nikolay Prokofiev <nprok...@gmail.com> wrote:

Hi.

I'm trying to convert js native number to GWT Long and send it over gwt-rpc. But I got very weird results..

public class gwtbugEntryPoint implements EntryPoint {    @Override    public void onModuleLoad() {      String data = "{\"type\":\"upd\", \"id\":123}";      ServerEvent serverEvent = JsonUtils.<ServerEvent>safeEval(data);      RootPanel.get().add(new HTML("GWT id="+serverEvent.getId()));    }    }  class ServerEvent extends JavaScriptObject {      protected ServerEvent() {      }    public final native String getType()/*-{ return this.type; }-*/;    public final Long getId(){      String idStr = _getId();      GWT.log("idSTr:" + idStr);      Long id = new Long(idStr);      GWT.log("id:"+id);      return id;  }    public final native String  _getId()/*-{ return this.id; }-*/;  }

console output:

idSTr:123

id:0

Can anyone explain me, how that could happen?

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