How to capture backspave and delete key events

Hi ,
i would like perform some javascript code on pressing backspace or delete key.
initially i thought of adf clientlsitener keypress event.but this is not capturing backsapce key event
what is the alternate way capture backspace or delete key event?
please help

Hi
the following script cancels the input event when the back key is pressed
       function keyTrap(inputEvent){
         var keycode = inputEvent.getKeyCode();
         if(keycode ==8){
           inputEvent.cancel();
       }Use a clientListener
        <af:inputText label="Label 4" id="it7">
          <af:clientListener method="keyTrap" type="keyDown"/>
        </af:inputText>Frank

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