263145 - KeyCode of "Escape" is different in onKeyPress and onKeyUp

Status: RESOLVED INVALID

(Core :: DOM: Events, defect)

Description

[Martin Heidegger]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3

If you add a listener to the onKeyPress event, you get KeyCode == 0 if you press
the escape Key. If you add the same listener to onKeyUp you get KeyCode == 27 by
pressing the escape Key.

Reproducible: Always
Steps to Reproduce:
1. Create a HTML Page 
2. Add

  <script>
	window.onkeypress = function(e) {
	   document.body.innerHTML = "onKeyPress: "+e.which;
	}
    window.onkeyup = function(e) {
	    document.body.innerHTML = document.body.innerHTML + " / onKeyUp" + e.which;
	}
  </script>
  to the content.
3. Open the .html file and press escape.

Actual Results:  
Output display:
onKeyPress: 0 / onKeyUp: 27

Expected Results:  
Output display:
onKeyPress: 27 / onKeyUp: 27

Comment 1

[Hermann Schwab]

Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.8a5) Gecko/20041002
I made a testcase, which I will upload. Results below, 'Press ESC: ' is text
from the testcase, testcase gives:
onKeyPress: 0 / onKeyUp27          ESC

The keys, as seen by another testcase:
https://bugzilla.mozilla.org/attachment.cgi?id=55849&action=view
1) keydown charCode=0 keyCode=27 
2) keypress charCode=0 keyCode=27
3) keyup charCode=0 keyCode=27

If I watch the behaviour of the TAB key, the onKeyPress event gets consumed, if
focus walks away to Location Bar, and gets noted, if focus returns to the window. 

I´ll confirm, that somebody better in the know can resolve the bug.

I´ve tested some other keys with the attached testcase:
onKeyPress: 0                      TAB, then focus elsewhere
onKeyPress: 0 / onKeyUp9           TAB, then focus in Window
Press ESC: / onKeyUp20             Shift-Lock, only once
Press ESC: / onKeyUp20 / onKeyUp16 Left Shift (Shift-Lock was on)
Press ESC: / onKeyUp16             Left Shift, RightShift
Press ESC: / onKeyUp17             LeftCtrl, RightCtrl
Press ESC: / onKeyUp18             Alt
Press ESC: / onKeyUp17 / onKeyUp18 AltGr
onKeyPress: 0 / onKeyUp37          CursorLeft,NumCsrLft

Comment 2

[Hermann Schwab]

Attachment: reporters testcase

testcase can be used with any key

Comment 3

[Brandon Amedee]

With letter keys, for some reason onKeyPress is returning the KeyCode of the
capital letter while onKeyUp is returning the actual KeyCode.  You can see this
by either turning Caps Lock on then pressing and releasing letter keys, or
holding shift as you press and release them.

This bug seems to apply to almost any key you press, including the F-keys.

Comment 4

[Boris Zbarsky [:bzbarsky]]

That testcase is looking at .which, not .keyCode.  The latter is the keycode. 
The former is there for backwards compat with NS4; in NS4 keypress events .which
is the charCode unless it's a return/backspace keypress, in which case it's the
keycode.

Marking invalid.