Question

I am trying to do client side custom validation. I have the following code in my aspx page, but I keep getting an error saying

System.Web.HttpException (0x80004005): Control ‘chkList_Counts’
referenced by the ControlToValidate property of ‘validationCheck’
cannot be validated. at
System.Web.UI.WebControls.BaseValidator.CheckControlValidationProperty(String
name, String propertyName) at
System.Web.UI.WebControls.CustomValidator.ControlPropertiesValid() at
System.Web.UI.WebControls.BaseValidator.OnPreRender(EventArgs e) at
System.Web.UI.Control.PreRenderRecursiveInternal() at

I cannot even see my page. I get the error right away before the page displays.

Below is my code

   <div> 
          <asp:Panel ID="panel3" runat="server" CssClass="cis_edit_pnl" 
              GroupingText="Counts" Width="1240px"> 
              <asp:CheckBoxList ID="chkList_Counts" runat="server" 
                   RepeatDirection="Horizontal" 
                   RepeatColumns="3" Width="1060px"> 
              </asp:CheckBoxList> 
               <asp:CustomValidator ID="validationCheck" runat="server" ControlToValidate="chkList_Counts" ClientValidationFunction="check_checkBoxList" EnableClientScript="true" ErrorMessage="At least one of the check boxes should be checked"> 
                </asp:CustomValidator> 
         </asp:Panel> 
  </div>

and my javascript function is like this

    function check_checkBoxList(sender, args) { 
        debugger; 
        if (check_Counts() == false) { 
            args.IsValid = false; 
            return; 
        } 
        args.IsValid = true; 
        return; 
    } 

 function check_casrepCounts() { 
        var control; 
        control = document.getElementById("<%=chkList_Counts.ClientID %>").getElementsByTagName("input"); 
        if (eval(control)) { 

            for (var i = 0; i < control.length; i++) { 
                if (control[i].checked == true) 
                    return true; 
            } 
            return false; 
        } 
    }

Thanks in advance.

Answer 1

It works fine now, I just had to remove controlToValidate and it worked.