When using: Value = "(null)" Text = "(no user)" as item in the ListBox, the filter must work correctly, and after opening the menu the item should be checked if previously filtered. Additionally if the item have NULL value instead of "(null)" The visible value must be localized.
Replicate by dragging a RadListBox item vertically in the Drag-and-drop demo, on a mobile device.
Setting EnableEmbeddedSkins="false" in RadGrid when FilterType="HeaderContext" is not applied to the ListBox (filterCheckList) hence the following error is thrown:
Enabling/Disabling the ListBox on the client is not persisted across PostBacks.
ListBox markup
<telerik:RadListBox runat="server" ID="RadListBoxA" CheckBoxes="true" Enabled="false">
<Items>
<telerik:RadListBoxItem Text="Item 1" />
<telerik:RadListBoxItem Text="Item 2" />
<telerik:RadListBoxItem Text="Item 3" />
<telerik:RadListBoxItem Text="Item 4" />
</Items>
</telerik:RadListBox>
<telerik:RadButton runat="server" ID="RadButton1" Text="Toggle State" AutoPostBack="false" OnClientClicked="ToggleListBoxStates" />
<telerik:RadButton runat="server" ID="RadButton2" Text="Postback" AutoPostBack="true" />
OnClientClicked event handler
function ToggleListBoxStates(sender, args) {
var listBoxA = $find("<%= RadListBoxA.ClientID %>");
listBoxA.trackChanges();
listBoxA.set_enabled(!listBoxA.get_enabled());
listBoxA.commitChanges();
}
Run the example, change the ListBox state and do a PostBack.
Notice, the state changes back.
<telerik:RadListBox
RenderMode="Lightweight"
runat="server"
ID="RadListBoxSource"
AllowTransfer="true"
TransferToID="RadListBoxDestination"
ButtonSettings-AreaWidth="35px">
<EmptyMessageTemplate>
empty message
</EmptyMessageTemplate>
</telerik:RadListBox>
<telerik:RadListBox
RenderMode="Lightweight"
runat="server"
ID="RadListBoxDestination"
ButtonSettings-AreaWidth="35px">
<EmptyMessageTemplate>
empty message2
</EmptyMessageTemplate>
</telerik:RadListBox>