Hello,

I am trying to use a RadListBox to display items that a user has selected on a RadGrid.

There is an instance where, on a button click, I am attempting to add 2000+ items to the radlistbox.  This is all being done in JavaScript.

When adding this many items, the browers (IE 8) displays a message stating that there is script being run on the page that is causing the page to not respond.  I believe this is being caused by having to add so many items to the RadListBox.

Is there a workaround for this, or another control that i can use to display selected items from the grid?  I need to keep this on client side in Javascript.

Here is the script that I am using to add items to the RadListBox (my radlistbox is named rlbSelectedContacts):

                            var rlbSelectedContacts = $find("<%=rlbSelectedContacts.ClientID %>");
                            if (rlbSelectedContacts)
                            {
                                    for (each item in my list of items to add) //this FOR loop could iterate thousands of times
                                    {
                                        var item = new Telerik.Web.UI.RadListBoxItem();
                                        if (item)
                                        {
                                            item.set_text(contactName);
                                            item.set_value(contactId);
                                            rlbSelectedContacts.trackChanges();
                                            rlbSelectedContacts.get_items().add(item);
                                            rlbSelectedContacts.commitChanges();
                                         }
                                    }
                             }

Hello Dave Hollen,

It's expected behavior, because IE doesn't handle dom elements so good and you're adding too many items.
I recommend using RadComboBox instead and load the items on demand as it's demonstrated here.

Greetings,
Yana
the Telerik team