keypress keydown keyup

http://stackoverflow.com/questions/4843472/javascript-listener-keypress-doesnt-detect-backspace

chrome에서는 keypress()가 delete detect하지 못함.

web browser 마다 keypress의 detect 범위가 다름

Single keyclick events triggered

on Chrome

• keydown/keypress/keyup when browser registers a keyboard input (keypress is fired)

• keydown/keyup if no keyboard input (tested with alt, shift, backspace, arrow keys)

• keydown only for tab?

on Firefox

• keydown/keypress/keyup when browser registers a keyboard input but also for backspace, arrow keys, tab (so here keypress is fired even with no input)

• keydown/keyup for alt, shift