Getting length of TextBox value during key event?

[rl]

During a key event (down,press or up), is there a way to get the length of the TextBox as it is being modified?  The value isn't updated until the input is accepted so I can't just use getValue().length();  For example, if the value is "HELLO" (length of 5 characters) and the user presses the delete key 4 times, the value length is still 5 until the textbox blurs.   I want to get at the temporary value as it's being edited.

How do I do it?

[linhua]

From my point of view,

You can get which key(like del) has been pressed in the event, you
also can get event source(the text box). You can write a method to
calculate the length yourself.

[Thomas Broyer]

The value should have been updated in KeyUp (it obviously won't be in KeyDown and KeyPress as, as you said, they're cancelable events)