Steps to Reproduce

https://zkfiddle.org/sample/2vcj3e7/2-inconsistent-android-keyboards

Run locally with the tablet-ui disabled

https://www.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_Library_Properties/org.zkoss.zkmax.tablet.ui.disabled

Click in the timebox

Use the android virtual keyboard "backspace" key to delete the content

Current Result

Some keyboards delete the colon

Some keyboards do not delete the colons

Some keyboards can type free text

Some keyboards cannot type free text

Some keyboards will fail add more than 3 number characters

Some keyboards will cause the "addTime" method to add a large number of characters in one time.

(Ask matt for further test cases if needed)

test cases:

delete everything with backspace, type in 12:34 (including colon)

delete everything with backspace, type in 12345

delete everything with backspace, type foobar, then blur, then type a real time

Expected Result

consistent behavior regardless of virtual keyboard

Debug Information

each tested keyboard had a different sequence of events when using the backspace key.

backspace button on android virtual keyboard generates events:
– samsung keyboard: keydown / keyup
– Gboard (En-Us): keydown / input / keyup
– Gboard (pinyin): keydown / keyup/ select

PC:
– mobile emulation: keydown / select / keyup
– regular PC chrome: keydown / select / keyup
– FF / Edge same
– IE 11: keydown / keyup

This also apply to other key presses.

likely related to:

https://tracker.zkoss.org/browse/ZK-4721

Workaround