Wt

Maybe in your signal handler, you should call preventDefaultAction(true) if you detect a function key (or whatever you're wanting to prevent), and call preventDefaultAction(false) otherwise?

Neither preventDefaultAction(true) nor preventPropagation(true) has no effect when called from the event handler. I tried calling it on the widget object keyWentDown() signal and also on the Wt::WApplication::instance()->globalKeyWentDown() signal. Both work if called in the widget constructor, but there it applies on any key pressed. And both do not work in the event handler, where I have an event object with the information on which key was pressed.

Any other ideas how to do workaround this? I can of course prevent default action for all keys in the constructor and then handle myself typing into the input fields, but I still hope for an easier solution))

I thought about capturing all keyboard events and "manually" acting for some of them, but that's terribly onerous. When I press CTRL+A, you're going to select all the text? When the user selects a word and presses "a", you're going to remove the word and replace it with 'a'? I anticipate only confusion and delay down those tracks.

Sorry, I'm out of ideas. On the other hand, you neatly answered my inquiry of earlier: https://redmine.webtoolkit.eu/boards/2/topics/14729

Glad to know this solved your problem. So you will disable browser default action and process all key events manually to respond with b to a? By the way you could post a link to this thread in your topic or just post an answer there ;)