Disable scroll down when spacebar is pressed on firefox [duplicate]

Answer 1

This should do the trick. It states that when the spacebar is pressed on the page/document it doesn't just prevent its default behavior, but reverts back to original state.

return false seems to include preventDefault. Source

Check JQuery API's for more information about keydown events - http://api.jquery.com/keydown/

window.onkeydown = function(e) { 
    return !(e.keyCode == 32);
};

JQuery example

$(document).keydown(function(e) {
    if (e.which == 32) {
        return false;
    }
});

EDIT:

As @amber-de-black stated "the above code will block pressing space key on HTML inputs". To fix this you e.target where exactly you want spacebar blocked. This can prevent the spacebar blocking other elements like HTML inputs.

In this case we specify the spacebar along with the body target. This will prevent inputs being blocked.

window.onkeydown = function(e) {
  if (e.keyCode == 32 && e.target == document.body) {
    e.preventDefault();
  }
};

NOTE: If you're using JQuery use e.which instead of e.keyCode Source.

The event.which property normalizes event.keyCode and event.charCode

JQuery acts as a normalizer for a variety of events. If that comes to a surprise to anyone reading this. I recommend reading their Event Object documentation.

Answer 2

Detect if the spacebar is being pressed. If it is, then prevent its default behaviour.

document.documentElement.addEventListener('keydown', function (e) {
    if ( ( e.keycode || e.which ) == 32) {
        e.preventDefault();
    }
}, false);

Answer 3

Have you tried capturing the keydown event in javascript? If you are using jQuery you can read more about capturing key events here: http://api.jquery.com/keydown/

If you aren't you can capture and ignore the space bar keypress as described here: https://stackoverflow.com/a/2343597/1019092