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Prevent Spacebar Doing Page Down

When the Spacebar key is received outside a text entry area, discard it

  1. // ==UserScript==
  2. // @name        Prevent Spacebar Doing Page Down
  3. // @author      Jefferson "jscher2000" Scher
  4. // @namespace   JeffersonScher
  5. // @description When the Spacebar key is received outside a text entry area, discard it
  6. // @include     *
  7. // @version     1.0
  8. // @grant       none
  9. // @copyright   Copyright 2018 Jefferson Scher
  10. // @license     BSD 3-clause
  11. // ==/UserScript==
  12.  
  13. function PSDPD_KeyCheck(key){
  14.   // Don't modify text editing
  15.   if (key.target.nodeName == "INPUT" || key.target.nodeName == "TEXTAREA" || key.target.nodeName == "SELECT") return;
  16.   if (key.target.hasAttribute("contenteditable") && key.target.getAttribute("contenteditable") == "true") return;
  17.   // Don't modify certain combinations
  18.   if (key.ctrlKey || key.altKey || key.metaKey) return;
  19.   // If it's a space character, kill the event
  20.   if (key.key == ' '){
  21.     key.stopPropagation();
  22.     key.preventDefault();
  23.     return false;
  24.   }
  25. }
  26. // Monitor the keydown event
  27. document.addEventListener('keydown', PSDPD_KeyCheck);