keyCode vs which

Question

I thought this would be answered somewhere on Stack Overflow  but I can   t find it   If I   m listening for a keypress event  should I be using  keyCode or  which to determine if the Enter key was pressed   I   ve always done something like the following       someid   keypress function e      if  e keyCode     13        e preventDefault           do something           But I   m seeing examples that use  which instead of  keyCode  What   s the difference  Is one more cross-browser friendly than the other

User · Answer

In Firefox  the keyCode property does not work on the onkeypress event  will only return 0   For a cross-browser solution  use the which property together with keyCode  e g   var x   event which    event keyCode      Use either which or keyCode  depending on browser support

User · Answer

I d recommend event key currently  MDN docs  https   developer mozilla org en-US docs Web API KeyboardEvent key  event KeyCode and event which both have nasty deprecated warnings at the top of their MDN pages  https   developer mozilla org en-US docs Web API KeyboardEvent keyCode https   developer mozilla org en-US docs Web API KeyboardEvent which  For alphanumeric keys  event key appears to be implemented identically across all browsers  For control keys  tab  enter  escape  etc   event key has the same value across Chrome FF Safari Opera but a different value in IE10 11 Edge  IEs apparently use an older version of the spec but match each other as of Jan 14 2018    For alphanumeric keys a check would look something like   event key      a    For control characters you d need to do something like   event key      Esc     event key      Escape    I used the example here to test on multiple browsers  I had to open in codepen and edit to get it to work with IE10   https   developer mozilla org en-US docs Web API KeyboardEvent code  event code is mentioned in a different answer as a possibility  but IE10 11 Edge don t implement it  so it s out if you want IE support

User · Answer

If you are staying in vanilla Javascript  please note keyCode is now deprecated and will be dropped      This feature has been removed from the Web standards  Though some browsers may still support it  it is in the process of being dropped  Avoid using it and update existing code if possible  see the compatibility table at the bottom of this page to guide your decision  Be aware that this feature may cease to work at any tim   https   developer mozilla org en-US docs Web API KeyboardEvent keyCode  Instead use either   key or  code depending on what behavior you want   https   developer mozilla org en-US docs Web API KeyboardEvent code https   developer mozilla org en-US docs Web API KeyboardEvent key  Both are implemented on modern browsers

User · Answer

A robust Javascript library for capturing keyboard input and key combinations entered  It has no dependencies     http   jaywcjlove github io hotkeys   hotkeys  ctrl a ctrl b r f   function event handler       switch handler key           case  ctrl a  alert  you pressed ctrl a    break          case  ctrl b  alert  you pressed ctrl b    break          case  r  alert  you pressed r    break          case  f  alert  you pressed f    break              hotkeys understands the following modifiers     shift  option     alt  ctrl  control  command  and     The following special keys can be used for shortcuts  backspace  tab  clear  enter  return  esc  escape  space  up  down  left  right  home  end  pageup  pagedown  del  delete and f1 through f19

User · Answer

look at this  https   developer mozilla org en-US docs Web API event keyCode  In a keypress event  the Unicode value of the key pressed is stored in either the keyCode or charCode property  never both  If the key pressed generates a character  e g   a    charCode is set to the code of that character  respecting the letter case   i e  charCode takes into account whether the shift key is held down   Otherwise  the code of the pressed key is stored in keyCode  keyCode is always set in the keydown and keyup events  In these cases  charCode is never set  To get the code of the key regardless of whether it was stored in keyCode or charCode  query the which property  Characters entered through an IME do not register through keyCode or charCode

User · Answer

jQuery normalises event which depending on whether event which  event keyCode or event charCode is supported by the browser      Add which for key events if   event which    null  amp  amp   event charCode    null    event keyCode    null         event which   event charCode    null   event charCode   event keyCode      An added benefit of  which is that jQuery does it for mouse clicks too      Add which for click  1     left  2     middle  3     right    Note  button is not normalized  so don t use it if    event which  amp  amp  event button     undefined         event which    event button  amp  1   1     event button  amp  2   3     event button  amp  4   2   0

User · Answer

Note  The answer below was written in 2010  Here many years later  both keyCode and which are deprecated in favor of key  for the logical key  and code  for the physical placement of the key   But note that IE doesn t support code  and its support for key is based on an older version of the spec so isn t quite correct  As I write this  the current Edge based on EdgeHTML and Chakra doesn t support code either  but Microsoft is rolling out its Blink- and V8- based replacement for Edge  which presumably does will     Some browsers use keyCode  others use which   If you re using jQuery  you can reliably use which as jQuery standardizes things  More here   If you re not using jQuery  you can do this   var key    which  in e   e which   e keyCode    Or alternatively   var key   e which    e keyCode    0       which handles the possibility that e which might be 0  by restoring that 0 at the end  using JavaScript s curiously-powerful    operator

[javascript] .keyCode vs. .which

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