I\'ve created this fiddle, it allows the user to click on either art or video, dynamically populating the the second listbox with the list associated with those selections. Ther
I think you would want to do something like this: Check if value is in select list with JQuery.
Modifying your code to something like this should work:
$("#SelectBox2 option:selected").each(function () {
var optionVal = $(this).val();
var exists = false;
$('#SelectedItems option').each(function(){
if (this.value == optionVal) {
exists = true;
}
});
if(!exists) {
inHTML += '';
}
});
Removing selected items would look like this:
$('#remove').click(function () {
$("#SelectedItems option:selected").remove();
});