Last Updated: 08 Nov 2021 12:26 by ADMIN
Release R1 2022
Created by: Asif Pathan
Comments: 0
Category: MultiSelect
Type: Bug Report

The SelectionChanged event is fired before Page_Load, hence when the ViewState is applied, it overrides the changes made inside the OnSelectionChanged handler.

Example - Clearing the CheckBox selection of a RadComboBox inside SelectionChanged

Workaround - Create a custom boolean property on the page and set it to true inside the SelectionChanged. Then, in Page_Load or the OnLoad event of any control, execute your logic based on the custom boolean property value.

Last Updated: 04 Feb 2021 00:42 by Hugo Augusto

A "Control 'RadMultiSelect1' referenced by the ControlToValidate property of 'MultiSelectValidator1' cannot be validated" error is thrown when the RadMultiSelect id is passed to the ControlToValidate property of the RequiredFieldValidator or CustomValidator.

Workaround: Using a CustomValidator with no ControlToValidate

<telerik:RadMultiSelect ID="RadMultiSelect1" runat="server" DataTextField="text" DataValueField="value">
        <telerik:MultiSelectItem Text="Item 1" Value="1"></telerik:MultiSelectItem>
        <telerik:MultiSelectItem Text="Item 2" Value="2"></telerik:MultiSelectItem>
        <telerik:MultiSelectItem Text="Item 3" Value="3"></telerik:MultiSelectItem>

<telerik:RadButton runat="server" ID="RadButton1" Text="Postback" AutoPostBack="true" />

<asp:CustomValidator ErrorMessage="Please select an item" ClientValidationFunction="ClientValidationFunction" runat="server" />
    function ClientValidationFunction(sender, args) {
        var multiselect = $find("<%= RadMultiSelect1.ClientID %>");

        if (multiselect.get_value().length == 0) {
            args.IsValid = false;

Last Updated: 06 Nov 2020 20:06 by ADMIN
Created by: Aurigo IT
Comments: 1
Category: MultiSelect
Type: Feature Request
Currently, to make the MultiSelect control work in an EditTemplate of a Grid in Batch EditMode, custom implementation is needed.
Last Updated: 21 Oct 2020 15:39 by ADMIN
Created by: Chris Vaughn
Comments: 0
Category: MultiSelect
Type: Bug Report

Scenario 1)

- Set MultiSelect1.Enabled=false; 
- Do a postback;

Expected: MultiSelect remain disabled
Actual: MultiSelect gets enabled

Workaround: set MultiSelect1.Enable = false instead of .Enabled.

Scenario 2)

- Add a MultiSelect inside asp:Panel
- Disable the asp:Panel

Expected: MultiSelect is disabled
Actual: MultiSelect remains enabled


Last Updated: 22 Jun 2020 17:19 by ADMIN
<telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" RenderMode="Lightweight" DecoratedControls="All" />
<telerik:RadMultiSelect runat="server"
    Placeholder="Select attendees..."
        <telerik:MultiSelectItem Text="Steven White"></telerik:MultiSelectItem>
        <telerik:MultiSelectItem Text="Nancy King"></telerik:MultiSelectItem>
        <telerik:MultiSelectItem Text="Nancy Davolio"></telerik:MultiSelectItem>