Question

        itemBox.addKeyUpHandler( new KeyUpHandler()
        {
            public void onKeyUp( KeyUpEvent event )
            {
                String currentValue = itemBox.getValue().trim();
                // handle backspace
                if( event.getNativeKeyCode() == KeyCodes.KEY_BACKSPACE )
                {
                    if( "".equals( currentValue ) )
                    {
                        doTheJob( );
                    }
                }
            }
        } );

Expect behavior:
when the textbox is empty, then i hit delete, will run doTheJob();

Current behavior:
when there is one character, i hit delete, it will trigger doTheJob();

In other word, is there any way i can get textbox content before i hit delete key?
I tried to used a var to hold the last value, but it needs to register another listener and the impl is not so effective.

Thanks for your input.

////////////////////Edit //////////////////////

use KeyDownHandler did solve the above problem, however lead to another problem:
i use itemBox.setValue( “” ); to clear the textbox but it will always have a comma there.

        itemBox.addKeyDownHandler( new KeyDownHandler()
        {
            public void onKeyDown( KeyDownEvent event )
            {
                // handle backspace
                if( event.getNativeKeyCode() == KeyCodes.KEY_BACKSPACE )
                {
                    String currentValue = itemBox.getValue().trim();
                    if( "".equals( currentValue ) )
                    {
                       doTheJob();
                    }
                }
                // handle comma
                else if( event.getNativeKeyCode() == 188 )
                {
                     doOtherJob();
                    //clear TextBox for new input
                     itemBox.setValue( "" );
                     itemBox.setFocus( setFocus );
                }
            }
        } );

Answer 1

after

itemBox.setFocus( setFocus );

prevent event bubbling with

event.preventDefault();
event.stopPropagation();

So the event will be canceled before comma is added to the textbox content.