Javascript Question posted in
A very good W3school tutorial can be found here.

Where do you suggest that keyboard constants be added to Javascript?

I saw this code here:

myCombobox.addEventListener('keydown', function(event) {
  if (event.key === 'Escape') {
    myCombobox.close();
    event.stopPropagation();
  }
});

My education and experience tells me that the code should be comparing a constant.

myCombobox.addEventListener(MouseEvents.KEYDOWN, function(event) {
  if (event.key === KeyboardConstants.ESCAPE) {
    myCombobox.close();
    event.stopPropagation();
  }
});

Is there a class or object in JavaScript that has a list of all the keys and keyboard events on it?

Other languages do this for very obvious specific reasons, to prevent typos, which prevent errors and non-functioning code.

Does Javascript love errors or do these classes exist and I couldn’t find them?

I tried to suggest this to TC39 and they said it’s not a language feature. Where do I suggest this feature?

Tags:

2

Answers


  1. 0

    If you really want to make this suggestion, you can make it here:
    https://github.com/w3c/uievents-code/issues/

    You can refer to this list whenever you need:
    https://www.w3.org/TR/uievents-code/#key-alphanumeric-writing-system

    There’s all the current KeyboardEvent codes described there.

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  2. 0

    Nothing stopping you from creating your own list of event.key string values…

    For a start:

    const KeyboardConstants = Object.freeze( 
  { BACKSPACE  : 'Backspace'
  , TAB        : 'Tab'
  , ENTER      : 'Enter'
  , ESCAPE     : 'Escape'
  , SPACE      : 'Space'
  , PAGE_UP    : 'PageUp'
  , PAGE_DOWN  : 'PageDownq'
  , END        : 'End'
  , HOME       : 'Home'
  , LEFT       : 'ArrowLeft'
  , UP         : 'ArrowUp'
  , RIGHT      : 'ArrowRight'
  , DOWN       : 'ArrowDown'
  , INSERT     : 'Insert'
  , DELETE     : 'Delete'
  // ...
  });
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