disable text selection while pressing 'shift'
Try a combo of JavaScript and css to prevent the selection in the first place:
$('li').attr('unselectable', 'on'); // IE
css (for browsers not IE):
li {
user-select: none; /* CSS3 (little to no support) */
-ms-user-select: none; /* IE 10+ */
-moz-user-select: none; /* Gecko (Firefox) */
-webkit-user-select: none; /* Webkit (Safari, Chrome) */
}
Try this after the Shift + click...
document.getSelection().removeAllRanges();
If that is not effective enough, you might have to also cancel the onselectstart event...
window.onload = function() {
document.onselectstart = function() {
return false;
}
}