How to compare locale String's in GWT?

yeah, because GWT not support java.text.Collator (and java.uti开发者_如何学JAVAl.Locale also) ;/

Any solutions?

I found this solution which uses javascript. This is because GWT doesn't support Collator.

http://osdir.com/ml/GoogleWebToolkit/2009-06/msg01572.html

public class Collator {

   public static final Collator getInstance() {
      return instance;
   }

   private static final Collator instance = new Collator();

   public native int compare( String source, String target ); /*-{
     return source.localeCompare( target );
   }-*/
}

I have never used it personally, but it looks promising. You might have to make changes so that there are no cross browser issues.

Edit:
Read up on JSNI.
This allows GWT to invoke raw "javascript" code within your Java code. This is what we are doing in the above class. The method "compare" makes a native call to javascript.
http://code.google.com/webtoolkit/doc/latest/DevGuideCodingBasicsJSNI.html#writing

Add Collator.java to your current work space.

You should be able to compare as follows.

Collator customCollator = Collator.getInstance();
if ( customCollator.compare( srcString , targetString ) > 0 )
{
     //the compare method will return an int.
     // write your code here.
}

Hope this helps.

the easiest way is to add a locale property to the constants class.

I have a GeneralConstants class which is defined like so

import com.google.gwt.i18n.client.Constants;

public interface GeneralConstants extends Constants {

   @DefaultStringValue( "de" )
   String locale();

in every constants class I can inherit the locale and I can easily define it in every language

to know what locale I'm in. I just call the attribute

private static GeneralConstants c = GWT.create( GeneralConstants.class );

...

formData.getForm().getName( c.locale() )

there is also a way to get the currently set locales but I can't remember :-)