how to disable backspace button in gwt?

[Mohammed Sameen]

Hi! 

My application does not need have any history 

support. 

The problem is that when I type something wrong in textbox,its shows warning in dialogbox and accidentally lose focus and 

then press Backspace key to delete a character from textbox,browser performs application to exit and the whole application is unloaded losing all the 

data. 

How can I disable this?Please give me suggestion.

Thanks! 

[Jens]

Fix your UI and refocus the TextBox/TextArea after the dialog box is closed.

-- J.

[Mohammed Sameen]

Jens,

Once the dialog box is appear that time unfortunately the user click the backspace which causes apps to exit..I need to handle this...any suggestion...

[David]

Install a keyboard listener to catch the backspace and call preventDefault. 

I have done that in an application before, not very nice but it works.

I moved on to using the Activity/Places framework so that my GWT app supports the browser history correctly. Due to the rather limited documentation it looked quite daunting at first, but once put in place it is actually quite simple.

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[Mohammed Sameen]

Hi,

Yeah i have added this listener see the code,

 Event.addNativePreviewHandler(new NativePreviewHandler() {

       @Override

       public void onPreviewNativeEvent(NativePreviewEvent event) {

           if (event.getNativeEvent().getKeyCode() == KeyCodes.KEY_BACKSPACE) {

               if (event.getNativeEvent().getEventTarget() != null) {

                   Element as = Element.as(event.getNativeEvent().getEventTarget());

                   boolean readOnly = as.getPropertyBoolean("readOnly");

                   boolean contentEditable = as.getPropertyBoolean("isContentEditable");

                   if (readOnly || !contentEditable) {

                       event.getNativeEvent().stopPropagation();

                       event.getNativeEvent().preventDefault();

                   }

               }

           }

       }

   });

Backspace issue is solved but one more issue its creating in IE.The error message says "

• Make sure the web address //ieframe.dll/dnserror.htm# is correct." when i click the hyperlink(see the attched image).Thanks for your reply

On Friday, July 11, 2014 2:48:29 PM UTC+5:30, Mohammed Sameen wrote:

[Jens]

Once the dialog box is appear that time unfortunately the user click the backspace which causes apps to exit..I need to handle this...any suggestion...

If you use the GWT DialogBox, have you tried setting it to a modal dialog box? 

-- J.

[Mohammed Sameen]

Yes,Thanks jens got it....

On Friday, July 11, 2014 2:48:29 PM UTC+5:30, Mohammed Sameen wrote:

[Mohammed Sameen]

Thanks for your reply  i solved by using the below snippet code

History.newItem("x");

History.addValueChangeHandler(new ValueChangeHandler<String>() {

@Override

public void onValueChange(ValueChangeEvent<String> event) {

String historyToken = event.getValue();

            if (!historyToken.equals("X"))

             History.newItem("X");

}

});

On Friday, July 11, 2014 2:48:29 PM UTC+5:30, Mohammed Sameen wrote: