Keyup not firing when keydown opens an alert

Question

I have two event handlers, one for keydown and one for keyup. The keydown event handler triggers an alert message, but this prevents the keyup event from firing.

Answer 1

The alert prevents the event from happening. What you could do instead is trigger this function manually, because it happens anyways.

var keyupfunction = function(e){
    alert('up');
    console.log('up');
}

window.addEventListener('keyup', keyupfunction);

window.addEventListener('keydown', function(e) {
    if (i++ % 2) alert('down');
    console.log('down');
    keyupfunction(e);
});

But really, you shouldn't be using alerts. It prevents these events, but who knows what else it might break. Use something custom instead.