Restrict the max li selected in external JS file

Question

I would like to restrict the li selected to be max 3 or max input to #moduleList is 3. How can I add it into the JavaScript below?

$('#moduleDrop li').click(function(){
$(this).toggleClass('selected');
$('#moduleList').html($('#moduleDrop .selected').clone());
});

Answer 1

Did your find a solution? Im just a js noob