![]() ![]() esc is usually processed via KeyDown: KeyPress doesn’t fire and KeyUp behaves differently for inputs and textareas in different browsers (mostly due to loss of focus).KeyDown is usually better for games when you have to provide better responsiveness to their actions.Suprisingly, when you hold a key, say in textarea, both KeyPress and KeyDown fire multiple times (Chrome 71), I’d use KeyDown if I need the event that fires multiple times and KeyUp for single key release.Also, in some cases you can easily prevent propagation of KeyDown but can’t (or can’t that easily) prevent propagation of KeyUp (for instance, if you want to submit on enter without adding newline to the text field). For handling arrows, you’ll probably need to use onKeyDown: if user holds ↓, KeyDown fires several times (while KeyUp fires only once when they release the button).By the way, I’ve noticed quite a quirk: in Chrome, when I press ctrl+ a and the input/ textarea is empty, for KeyPress fires with event.ke圜ode (and event.which) equal to 1! (when the input is not empty, it doesn’t fire at all). Read More: Passing a JS ArrayBuffer or TypedArray to Emscripten w/o CopyingĪlso, you should keep in mind that event.ke圜ode (and event.which) usually have same value for KeyDown and KeyUp but different one for KeyPress. So it seems that the browser (Firefox 43) erases the user’s selection, then fires the keypress event, then updates the fields contents, then fires keyup. The user selection is an empty string (preventing you from determining what was deleted by overwriting the selection).When the keypress event fires after entering the letter A, the text box now contains only the letter A. The user types 12345 into an input element.This is of critical importance if you are doing something that relies on knowing the new value after the input rather than the current value such as inline validation or auto tabbing. The value of the input element will be 1 (new value) inside the keyup handler. The value of the input element will be an empty string (old value) inside the keypress handler If the user types 1 into an empty input element: Most of the answers here are focused more on theory than practical matters and there’s some big differences between keyup and keypress as it pertains to input field values, at least in Firefox (tested in 43).
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