How to prevent form submission using the keyboard (esp. the space key)

I have a web application where on one specific screen I have to make sure the user clicked the button using the mouse as opposed to just pressing enter or space.

I have written this code:

$('button').keydown(function (e) {
    if (e.which === 10 || e.which === 13 || e.which === 32) {
        return false;
    }
});

However, this only works for enter. The form can still be submitted by pressing space on a button. I am just wondering what caused this inconsistency and how to get around it?

Edit:

Example fiddle: http://jsfiddle.net/billccn/3JmtY/1/. Check the second check box and pressing enter while the focus is on the button will have no effect. If I further disable the input and expand the keydown trapping to the whole form, then enter cannot be used to submit the form.

Edit 2:

I do have a backup plan which is replacing the button with a link or even a plain div and use the click event to submit the form programmatically. However, extra work is required to make it look like a button so I'd rather use a button is possible.

Solution

Just found out: handling space (32) on keyup will prevent the click event.

Updated fiddle: http://jsfiddle.net/3JmtY/2/