Register a tap with a callback for mobile devices. Adjustable sensitivity and class name for "being touched." Supports mouse clicking in browsers too.

tap.js

isMobile = function() {
	if (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test((navigator.userAgent||navigator.vendor||window.opera))||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test((navigator.userAgent||navigator.vendor||window.opera).substr(0,4)))
		return true;
	else
		return false;
}

var registerTap = function(element, callback, long_callback) {
    touchstart = function(e) {
    		e.stopPropagation();
        var touchclass = 'being-touched';
        var sensitivity = 20;
        var start = {
            x: event.touches[0].pageX,
            y: event.touches[0].pageY
        };
        //setTimeout(function() {
            element.className += " "+touchclass;
        //}, 0);
        if (typeof(long_callback) == "function") {
					longpress = setTimeout(function(element, callback) {
		        setTimeout(function() {
		            callback.call(element);
		          }, 0);
	            element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
	            element.removeEventListener('touchend', touchend);
	            element.removeEventListener('touchmove', touchmove);
					}, 500, element, long_callback);
				}
        touchend = function() {
        	setTimeout(function() {
            callback.call(element);
          }, 0);
            //setTimeout(function() {
                element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
            //}, 0);
            element.removeEventListener('touchend', touchend);
            element.removeEventListener('touchmove', touchmove);
            if (typeof(longpress) != "undefined")
	            clearTimeout(longpress);
        };
        element.addEventListener('touchend', touchend, false);
        touchmove = function() {
            if (Math.abs(start.x - event.touches[0].pageX) > sensitivity || Math.abs(start.y - event.touches[0].pageY) > sensitivity) {
            //setTimeout(function() {
                element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
            //}, 0);
            element.removeEventListener('touchend', touchend);
            element.removeEventListener('touchmove', touchmove);
            if (typeof(longpress) != "undefined")
	            clearTimeout(longpress);
            }
        };
        element.addEventListener('touchmove', touchmove, false);
    };

    mousedown = function(e) {
    		e.stopPropagation();
        var touchclass = 'being-touched';
        var sensitivity = 20;
        var start = {
            x: e.x,
            y: e.y
        };

        element.className += " "+touchclass;

        if (typeof(long_callback) == "function") {
					longpress = setTimeout(function(element, callback) {
		        setTimeout(function() {
		            callback.call(element);
		          }, 0);
	            element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
	            element.removeEventListener('mouseup', mouseup);
	            element.removeEventListener('mousemove', mousemove);
					}, 500, element, long_callback);
				}

        mouseup = function() {
        	setTimeout(function() {
            callback.call(element);
          }, 0);
            //setTimeout(function() {
                element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
            //}, 0);
            element.removeEventListener('mouseup', mouseup);
            element.removeEventListener('mousemove', mousemove);
            if (typeof(longpress) != "undefined")
            	clearTimeout(longpress);
        };
        element.addEventListener('mouseup', mouseup, false);

        mousemove = function(e) {
        	if (Math.abs(start.x - e.x) > sensitivity || Math.abs(start.y - e.y) > sensitivity) {
            //setTimeout(function() {
                element.className = element.className.replace(new RegExp('\\b' + touchclass + '\\b'),'');
            //}, 0);
            element.removeEventListener('mouseup', mouseup);
            element.removeEventListener('mousemove', mousemove);
            if (typeof(longpress) != "undefined")
            	clearTimeout(longpress);
          }
        };
        element.addEventListener('mousemove', mousemove, false);
    };
    if (!isMobile())
    	element.addEventListener('mousedown', mousedown, false);
    element.addEventListener('touchstart', touchstart, false);
}