A problem surfaced on Stack Overflow recently from a Delphi developer, Tom Byrnes, who discovered that on Android, the Enter (or Return) key no longer triggers the OnKeyDown and OnKeyUp events. The keydown and keyup events provide a code indicating which key is pressed, while keypress indicates which character was entered. Answer: No, unfortunately, not all key codes are standardized.
… For example, a lowercase "a" will be reported as 65 by keydown and keyup, but as 97 by keypress.An uppercase "A" is reported as 65 by all events. This was unfortunate as Tom wanted to code to run in (one of) those handlers. The following key codes differ across browsers: keydown/keyup event.keyCode Opera MSIE Firefox Safari Chrome Key pressed _____ 173 173 181 173 173 Mute On|Off 174 174 … Protected Overridable Sub OnKeyUp (e As KeyEventArgs) Parameters. The following code example uses the KeyUp event with the Help class to display pop-up style help to the user. e KeyEventArgs . It can be attached to any element, but the event is only sent to the element that has the focus.
You can compare the virtual key code that you want to the Key parameter in the OnKeyUp and OnKeyDown events of each control. // This example demonstrates how to use the KeyUp event with the Help class to display // pop-up style help to the user of the application. For example, the minus key has different key codes in different browsers. A KeyEventArgs that contains the event data. When a keydown, keyup, or keypress event occurs, JavaScript records the key code of the key that was pressed or released. onkeydown, onkeypress und onkeyup (in dieser Reihenfolge) werden vom einfachen Drücken und Loslassen einer Taste auf der Tastatur erzeugt. onkeydown und onkeypress feuern kontinuierlich so lang der Benutzer die Taste gerückt hält. Javascript Key Codes The following are javascript key codes. ... ‡ Key code 219 also corresponds to the Win Key (Start) in older versions of Opera.
These key codes also apply to Delphi XE5 and AppMethod. Wenn der Benutzer die Taste loslässt, feuert onkeyup … onkeydown und onkeypress feuern kontinuierlich so lang der Benutzer die Taste gerückt hält. Examples. onkeydown, onkeypress und onkeyup (in dieser Reihenfolge) werden vom einfachen Drücken und Loslassen einer Taste auf der Tastatur erzeugt. When using binding, on enter key pressed I do not receive the actual input value #15635 List Of All Virtual Key Codes For OnKeyDown And OnKeyUp In Delphi XE6 Firemonkey On Android And IOS By Admin on July 6, 2014 If you are building any kind of cross platform app where you use the keyboard you will probably need to know the various virtual key code constants which are listed in the System.UITypes unit in Delphi XE6 Firemonkey. jQuery normalizes the .which property of the eventObj so you can reliably use it to retrieve the key code.