Delete Validation

[Igor]

I my code bellow in the delete button i have OnClientClick="return confirm('Are you sure you want to delete?')
and it works great. However if no check boxes are checked and delete button is pressed i want to display different validation message. 

An example on how to check if any check boxes are checked from client side would be great.

<telerik:RadGrid GridLines="None" ID="grdInventory" AllowMultiRowSelection="True"
Style="border: 1" runat="server" AllowPaging="True" AllowSorting="True" PageSize="10"
Width="95%" Height="220px" AllowAutomaticDeletes="True" EnableLinqExpressions="false"
OnNeedDataSource="grdInventory_NeedDataSource" OnItemCommand="grdInventory_ItemCommand">
<MasterTableView AutoGenerateColumns="False" Width="100%" CommandItemDisplay="Bottom" DataKeyNames="Id">
    <CommandItemTemplate>
        <div style="padding: 5px 5px;">
            <asp:LinkButton ID="btnAdd" runat="server" OnClick="btnAdd_Click">Add</asp:LinkButton>

            <asp:LinkButton ID="btnDelete" runat="server"
                OnClientClick="return confirm('Are you sure you want to delete?');" OnClick="btnDelete_Click">
                    Delete</asp:LinkButton>
        </div>
    </CommandItemTemplate>
    <Columns>
        <telerik:GridClientSelectColumn UniqueName="SelectColumn">
            <HeaderStyle Width="30px" />
        </telerik:GridClientSelectColumn>
        <telerik:GridBoundColumn DataField="SizeName" DataType="System.String" HeaderText="Size"
            UniqueName="SizeName">
            <HeaderStyle Width="100px" />
            <ItemStyle Wrap="False" />
        </telerik:GridBoundColumn>
        <telerik:GridBoundColumn DataFormatString="{0:d}" DataField="Date" DataType="System.DateTime"
            HeaderText="Reserved Date" SortExpression="Date" UniqueName="Date">
            <HeaderStyle Width="100px" />
            <ItemStyle Wrap="False" />
        </telerik:GridBoundColumn>
        <telerik:GridBoundColumn DataField="Available" DataType="System.String" HeaderText="Available"
            UniqueName="Available">
            <HeaderStyle Width="100px" />
            <ItemStyle Wrap="False" />
        </telerik:GridBoundColumn>
        <telerik:GridButtonColumn CommandName="Delete" ButtonType="ImageButton"
            ConfirmText="Are you sure you want to delete?"
            UniqueName="DeleteColumn" ImageUrl="../../Images/MediaTree/DeleteIcon.png">
            <HeaderStyle Width="30px" />
        </telerik:GridButtonColumn>
    </Columns>
</MasterTableView>
</telerik:RadGrid>

[Princy]

Hello Igor,

The following code snippet shows how to achieve this.

C#:

protected void grdInventory_ItemCreated(object sender, GridItemEventArgs e)
  {
     if (e.Item is GridDataItem)
      {
          GridDataItem item = (GridDataItem)e.Item;
          CheckBox chkbox = (CheckBox)item["SelectColumn"].Controls[0];
          ImageButton deletebtn = (ImageButton)item["DeleteColumn"].Controls[0];
          deletebtn.Attributes.Add("onclick","btnclick('"+chkbox.ClientID+"');");
      }
  }

Java Script:

<script type="text/javascript">
    function btnclick(checkbox) {
        var chekbox = document.getElementById(checkbox);
        if(chekbox.checked)
            confirm("new confirmation message");
        else
        confirm("Are you sure you want to delete?");
     }
</script>

Thanks,
Princy.