When the Lightbox image appears, I can only close the modal by clicking outside of it. I would like to close the modal by clicking anywhere within the viewport, as well as with Esc or Space Bar.
I hope I'm understanding your question properly. The way I read is that you also want to close the modal/ lightbox when clicking inside it. This would be accomplished like this:
$('#yourModalID').on('click', function(){
$(this).modal('close');
});
You also want to close the modal on a spacebar press. You could do this like that:
$('body').on('keyup', function(event){
if (event.keyCode == 32){ //check if the key pressed was the space bar
$('#yourModalID').modal('hide');
}
});
You should probably only add this event listener when opening the modal and remove it when the modal is closed to get better performance.