disable text selection while pressing 'shift'

Question

I\'m implementing item selection functionality in javascript (using jQuery). item is a li that contains some html.
the user can click on one item (makes it select

Answer 1

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) */
}