When keypress events are generated for special keys, the browser needs to return some non-ASCII value to indicate which key ways pressed. We'll see that various different browsers do this in different ways. Some browsers avoid this problem by not generating keypress events for special keys. A good case can be made that this is the right thing ...
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I'm trying to create a Custom Renderer in Android for my Xamarin Forms project and I want to capture the keypress from the user and handle it. I put the event in and when debugging the event is never hit... though others like TextChanged are.
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The long-button press is not handled in the software stack. That is why it works even when the Android OS is not-responding. The power-button long-press event is generally implemented in hardware i.e as an interrupt to the PMIC (power-management chip).
jQuery: Filter out non-printable keypress events Posted by twig at 6:36 PM Thursday, February 18, 2010 Its pretty handy to listen in for keydown, keyup and keypress events, but it also listens in for a bunch of stuff that, most of the time, we're really not interested in (such as ESC, Tab, F1-F12, backspace, CTRL+C, ALT+Tab, etc).