Here is a function that I made make a textbox a number only textbox:
public static void applyNumericMask(TextBox textBox, final boolean
allowDecminal)
{
textBox.addKeyDownHandler(new KeyDownHandler(){
public void onKeyDown(KeyDownEvent keyDownEvent) {
int keyCode = keyDownEvent.getNativeKeyCode();
if ((!((keyCode > 46 && keyCode < 58)) && !((keyCode > 96 &&
keyCode < 108))) && (keyCode != (char) KeyCodes.KEY_TAB)
&& (keyCode != (char) KeyCodes.KEY_BACKSPACE)
&& (keyCode != (char) KeyCodes.KEY_ESCAPE)
&& (keyCode != (char) KeyCodes.KEY_DELETE) && (keyCode
!= (char) KeyCodes.KEY_ENTER)
&& (keyCode != (char) KeyCodes.KEY_HOME) && (keyCode !=
(char) KeyCodes.KEY_END)
&& (keyCode != (char) KeyCodes.KEY_LEFT) && (keyCode !=
(char) KeyCodes.KEY_UP) && (keyCode != 190 || !allowDecminal) && (keyCode !=
110 || !allowDecminal)
&& (keyCode != (char) KeyCodes.KEY_RIGHT) && (keyCode !=
(char) KeyCodes.KEY_DOWN)) {
keyDownEvent.preventDefault();
keyDownEvent.stopPropagation();
}
}
});
textBox.addKeyUpHandler(new KeyUpHandler(){
public void onKeyUp(KeyUpEvent keyUpEvent) {
int keyCode = keyUpEvent.getNativeKeyCode();
if ((!((keyCode > 46 && keyCode < 58)) && !((keyCode > 96 &&
keyCode < 108))) && (keyCode != (char) KeyCodes.KEY_TAB)
&& (keyCode != (char) KeyCodes.KEY_BACKSPACE)
&& (keyCode != (char) KeyCodes.KEY_ESCAPE)
&& (keyCode != (char) KeyCodes.KEY_DELETE) && (keyCode
!= (char) KeyCodes.KEY_ENTER)
&& (keyCode != (char) KeyCodes.KEY_HOME) && (keyCode !=
(char) KeyCodes.KEY_END)
&& (keyCode != (char) KeyCodes.KEY_LEFT) && (keyCode !=
(char) KeyCodes.KEY_UP) && (keyCode != 190 || !allowDecminal) && (keyCode !=
110 || !allowDecminal)
&& (keyCode != (char) KeyCodes.KEY_RIGHT) && (keyCode !=
(char) KeyCodes.KEY_DOWN)) {
keyUpEvent.preventDefault();
keyUpEvent.stopPropagation();
}
}
});
}
You can actually merge the two if statements, but I was just really lazy.
This also blocks copy/paste. There are probably better ways to do this,
but this has been working for me.
On Wed, Apr 28, 2010 at 2:29 PM, Graham J <[email protected]> wrote:
> I had some input checking going on with the old KeyListener interface
> that would cancelKey() the event if the input was not a digit.
>
> I'm trying to convert that over to use a KeyDownHandler, but I can't
> figure out how to check if they key is a digit.
>
> This is the closest I've got:
>
> public void onKeyDown(KeyDownEvent event)
> {
> int keyCode = event.getNativeKeyCode();
> if (!Character.isDigit(keyCode)
> {
> // TextBox.cancelKey() suppresses the current keyboard
> event.
> ((TextBox) event.getSource()).cancelKey();
> }
> }
>
> The catch is, Character.isDigit(int) is not emulated in GWT -- it only
> accepts a char parameter.
>
> So, how do I convert the keyCode to a char, or, check isDigit() on the
> keyCode? Or an entirely different method? IS getNativeKeyCode() the
> right approach for this?
>
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