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preventEvent( event )

preventEvent( event )

Aug 16, 2023



This function cancels an event and prevents it from bubbling up.

Parameters:

  • event ā€“ reference to the event to cancel

Example:

The following can be used on the onkeydown event to restrict which keys can be pressed.Ā 

function gradeKeys(event, element) { Ā  var key = event.keyCode; Ā  switch (key) { Ā  Ā  case 65: // allow A Ā  Ā  case 66: // allow B Ā  Ā  case 67: // allow C Ā  Ā  case 68: // allow D Ā  Ā  case 70: // allow F Ā  Ā  case 8: // allow backspace Ā  Ā  case 46: // allow delete Ā  Ā  case 37: // allow left arrow Ā  Ā  case 39: // allow right arrow Ā  Ā  case 40: // allow down arrow Ā  Ā  case 38: // allow up arrow Ā  Ā  case 13: // allow enter Ā  Ā  Ā  break; Ā  Ā  default: // disallow all other keys Ā  Ā  Ā  preventEvent(event); Ā  }Ā  }