What's the best way to detect a 'touch screen' device using JavaScript?

Question

I\'ve written a jQuery plug-in that\'s for use on both desktop and mobile devices. I wondered if there is a way with JavaScript to detect if the device has touch screen capa

Answer 1

var isTouchScreen = 'createTouch' in document;

or

var isTouchScreen = 'createTouch' in document || screen.width <= 699 || 
    ua.match(/(iPhone|iPod|iPad)/) || ua.match(/BlackBerry/) || 
    ua.match(/Android/);

would be a more thorough check I suppose.