Which keycode for escape key with jQuery

Question

I have two functions   When enter is pressed the functions runs correctly but when escape is pressed it doesn t  What s the correct number for the escape key       document  keypress function e         if  e which    13      save   click         enter  works as expected      if  e which    27      cancel   click       esc    does not work

User · Answer

Just posting an updated answer than e keyCode is considered DEPRECATED on MDN   Rather you should opt for e key instead which supports clean names for everything  Here is the relevant copy pasta  window addEventListener  keydown   function  event      if  event defaultPrevented        return     Do nothing if the event was already processed        switch  event key        case  ArrowDown            Do something for  down arrow  key press        break      case  ArrowUp            Do something for  up arrow  key press        break      case  ArrowLeft            Do something for  left arrow  key press        break      case  ArrowRight            Do something for  right arrow  key press        break      case  Enter            Do something for  enter  or  return  key press        break      case  Escape            Do something for  esc  key press        break      default        return     Quit when this doesn t handle the key event            Cancel the default action to avoid it being handled twice   event preventDefault       true

User · Answer

To find the keycode for any key  use this simple function   document onkeydown   function evt        console log evt keyCode

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Try the jEscape plugin  download from google drive     document  escape function         alert  ESC button pressed           or get keycode for cross browser  var code    e keyCode   e keyCode   e which   if  code     27  alert  ESC    if  code     13  alert  ENTER      maybe you can use switch   var code    e keyCode   e keyCode   e which   switch  code        case 27         alert  ESC           break       case 13         alert  ENTER           break

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Rather than hardcode the keycode values in your function  consider using named constants to better convey your meaning   var KEYCODE ENTER   13  var KEYCODE ESC   27     document  keyup function e      if  e keyCode    KEYCODE ENTER      save   click      if  e keyCode    KEYCODE ESC      cancel   click          Some browsers  like FireFox  unsure of others  define a global KeyEvent object that exposes these types of constants for you  This SO question shows a nice way of defining that object in other browsers as well

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I m was trying to do the same thing and it was bugging the crap out of me   In firefox  it appears that if you try to do some things when the escape key is pressed  it continues processing the escape key which then cancels whatever you were trying to do   Alert works fine   But in my case  I wanted to go back in the history which did not work   Finally figured out that I had to force the propagation of the event to stop as shown below     if  keyCode    27        history back         if  window event                   IE works fine anyways so this isn t really needed         e cancelBubble   true          e returnValue   false            else if  e stopPropagation                   In firefox  this is what keeps the escape key from canceling the history back           e stopPropagation            e preventDefault               return  false

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Try with the keyup event     document  keyup function e      if  e keyCode     13      save   click           enter   if  e keyCode     27      cancel   click         esc

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I have always used keyup and e which to catch escape key

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27 is the code for the escape key

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Your code works just fine  It s most likely the window thats not focused  I use a similar function to close iframe boxes etc     document  ready function            Set focus     setTimeout  window focus    1000           document  keypress function e            Enable esc     if  e keyCode    27          parent document getElementById  iframediv   style display  none         parent document getElementById  iframe   src   views view empty black html

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Your best bet is     document  keyup function e         if  e which     13      save   click         enter      if  e which     27      cancel   click       esc            OPTIONAL  Only if you want other elements to ignore event        e preventDefault        e stopPropagation          Summary   which is more preferable than keyCode because it is normalized keyup is more preferable than keydown because keydown may occur multiple times if user keeps it pressed  Do not use keypress unless you want to capture actual characters    Interestingly Bootstrap uses keydown and keyCode in its dropdown component  as of 3 0 2   I think it s probably poor choice there   Related snippet from JQuery doc     While browsers use differing   properties to store this information  jQuery normalizes the  which   property so you can reliably use it to retrieve the key code  This   code corresponds to a key on the keyboard  including codes for special   keys such as arrows  For catching actual text entry   keypress   may   be a better choice    Other item of interest  JavaScript Keypress Library

User · Answer

To explain where other answers haven t  the problem is your use of keypress   Perhaps the event is just mis-named but keypress is defined to fire when when an actualcharacteris being inserted  I e  text  Whereas what you want is keydown keyup  which fires whenever  before or after  respectively  the user depresses akey  I e  those things on the keyboard   The difference appears here because esc is a control character  literally  non-printing character   and so doesn t write any text  thus not even firing keypress  enter is weird  because even though you are using it as a control character  i e  to control the UI   it is still inserting a new-line character  which will fire keypress   Source  quirksmode

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To get the hex code for all the characters  http   asciitable com

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A robust Javascript library for capturing keyboard input and key combinations entered  It has no dependencies     http   jaywcjlove github io hotkeys   hotkeys  enter esc   function event handler       switch handler key           case  enter      save   click   break          case  esc      cancel   click   break              hotkeys understands the following modifiers    shiftoption altctrlcontrolcommand  and     The following special keys can be used for shortcuts backspacetab clear enter return esc escape space up down left right home end pageup pagedown del delete andf1 throughf19

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I know this question is asking about jquery  but for those people using jqueryui  there are constants for many of the keycodes     ui keyCode ESCAPE   http   api jqueryui com jQuery ui keyCode

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Answer extracted from my previous comment   You need to use keyup rather than keypress   e g      document  keyup function e      if  e which    13      save   click           enter   if  e which    27      cancel   click         esc       keypress doesn t seem to be handled consistently between browsers  try out the demo at http   api jquery com keypress in IE vs Chrome vs Firefox  Sometimes keypress doesn t register  and the values for both  which  and  keyCode  vary  whereas keyup is consistent   Since there was some discussion of e which vs e keyCode   Note that e which is the jquery-normalized value and is the one recommended for use      The event which property normalizes event keyCode and event charCode  It is recommended to watch event which for keyboard key input     from http   api jquery com event which

[javascript] Which keycode for escape key with jQuery

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