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Reset RadRadioButtonList state

How to

Deselect RadRadioButtonList with server or client-side code

Deselect the items of RadioButtonList  

Solution

  • Client-side Solution

    You can get reference to all radio list items via the get_items() method and use the set_selected(false); method to reset their state. Note that this will reset it only on the client-side and transferring this reset to the server is not a feature available in the control. You can hack the control into thinking nothing is selected by resetting its _selectedIndex property to -1 and making it updateClientState().

    <telerik:RadRadioButtonList ID="RadRadioButtonList1" runat="server" RepeatDirection="Horizontal">
      <Items>
          <telerik:ButtonListItem Text="Yes" Selected="true" Value="Yes"></telerik:ButtonListItem>
          <telerik:ButtonListItem Text="No" Value="No"></telerik:ButtonListItem>
      </Items>
    </telerik:RadRadioButtonList>
    <asp:Button Text="Reset Radio List" OnClientClick="resetRadioList(); return false;" runat="server" />
    <script type="text/javascript">
    function resetRadioList() {
        var radioButtonList = $find("<%=RadRadioButtonList1.ClientID%>");
        //reset the appearane of the items
        var items = radioButtonList.get_items();
        for (var i = 0; i < items.length; i++) {
            items[i].set_selected(false);
        }
        //transfer the no-items-selected state to the server code
        radioButtonList._selectedIndex = -1;
        radioButtonList.updateClientState();
    }
    </script> 
    
  • Server-side Solution

    To reset the state via the code-behind use the Items collection and Selected property of the component:

    <telerik:RadRadioButtonList ID="RadRadioButtonList1" runat="server" RepeatDirection="Horizontal">
      <Items>
          <telerik:ButtonListItem Text="Yes" Selected="true"  Value="Yes"></telerik:ButtonListItem>
          <telerik:ButtonListItem Text="No" Value="No"></telerik:ButtonListItem>
      </Items>
    </telerik:RadRadioButtonList>
    <asp:Button Text="Reset Radio List" OnClick="Reset_RadioList_Click" runat="server" />
    

    protected void Reset_RadioList_Click(object sender, EventArgs e)
    {
     for (int i = 0; i < RadRadioButtonList1.Items.Count; i++)
     {
        RadRadioButtonList1.Items[i].Selected = false;
     }
    }
    

    Protected Sub Reset_RadioList_Click(ByVal sender As Object, ByVal e As EventArgs)
        For i As Integer = 0 To RadRadioButtonList1.Items.Count - 1
            RadRadioButtonList1.Items(i).Selected = False
        Next
    End Sub
    
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