Jquery adding and removing items from listbox

Question

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

Answer 1

Get existing list of options, check if those you're adding already exist, if not, add them:

http://jsfiddle.net/bZXs4/

$('#add').click(function () {
     var inHTML = "";
     var $opts = $('#SelectedItems').find('option'); 

     $("#SelectBox2 option:selected").each(function () {
         var allowItemToBeAdded = true;
         var selectedVal = $(this).val();
         $opts.each(function(index, element){
             if($(this).val() === selectedVal){
                 allowItemToBeAdded = false;
             }
         });

         if(allowItemToBeAdded){
             inHTML += '<option value="' + selectedVal + '">' + $(this).text() + '</option>';
         }
     });

     if(inHTML !== ''){
         $("#SelectedItems").append(inHTML);
     }
 });

Answer 2

SEE THE LINK

write if condition as

 if($("#SelectedItems option:contains("+$(this).val()+")").length<=0)                
   inHTML += '<option value="' + $(this).val() + '">' + $(this).text() + '</option>';

Then add

$('#remove').click(function(){

  $('#SelectedItems  :selected').each(function(i, selected) {
    $(this).remove();
});
});

Answer 3

Have a look at this solution:- Using the data attribute to keep track of the items parent list selector and avoiding a loop with the help of this selector and data attribute.

http://jsfiddle.net/pramodsankar007/rMpBv/

 $('#add').click(function () {
        var itemsToAdd = [];
        $("#SelectBox2 option:selected").each(function () {
            var optionVal = $(this).val();
            var key = $(this).data('key');
           if($('#SelectedItems option[value="' + optionVal + '"][data-key="' + key +'"]').length == 0)
           {
                 itemsToAdd.push($(this).removeAttr('selected').clone(true));
           }
        });
        $("#SelectedItems").append(itemsToAdd);
    });
});