I have a listbox with selection mode is multiple
<asp:ListBox id="Listbox1" runat="server" Width="230px" Height="168px"
SelectionMode="Multiple"></asp:ListBox>
I am databinding using a datasource
Me.Listbox1.Items.Clear()
Me.Listbox1.DataSource = ayl_arraylist_memberslist
Me.Listbox1.DataTextField = "Key"
Me.Listbox1.DataValueField = "Value"
Me.Listbox1.DataBind()
I am sending one listbox listbox1 item into userlistbox but after pressing add I can't get scrolled to selected item.
Better to take html list box
<select id="ListBox1" runat="server" size="10" style="width:230px; height:168px"></select>
<%--<asp:ListBox id="ListBox1" runat="server" Width="230px" Height="174px" SelectionMode="Multiple" ></asp:ListBox>--%>
and using jquery listbox change function in document.ready we can modify at the multiple mode as
$("#ListBox1").attr("multiple", false);
$("#ListBox1").change(function () { $("#ListBox1").attr("multiple", true); });
and write behind .cs code to get slected index
来源：https://stackoverflow.com/questions/11840034/how-to-scroll-selected-item-in-asp-listbox-in-multiple-mode