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How to control client side ASP.NET Validator checks

Below is the result of my page after running the code below:

I use client-side validation ValidatorEnablein my situation (if you know the best way to do this, let me know.)

My question is:

I have a gridview with a checkbox and a drop down list next to each other, as shown in the screenshot.

So, if the user checked, he included a drop-down list for selection. if the user clicks the submit button, he checks and asks the user to select any parameters from the drop-down list.

Problem:

But the problem is that it checks all the lines instead of what I clicked.

How can I force a check on this particular line that the user has set on the checkbox?

enter image description here

    <asp:GridView ID="gv" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" OnRowDataBound="gv_RowDataBound"
            EnableModelValidation="True">
            <Columns>
                <asp:BoundField DataField="ID" ControlStyle-Width="250px" HeaderText="ID" SortExpression="ID" />
                <asp:BoundField DataField="FirstName" ControlStyle-Width="250px" HeaderText="FirstName"
                    SortExpression="FirstName" />
                <asp:BoundField DataField="LastName" ControlStyle-Width="250px" HeaderText="LastName"
                    SortExpression="LastName" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:CheckBox ID="checkbox1" runat="server" />
                        <asp:DropDownList ID="ddl_PaymentMethod" runat="server">
                                    <asp:ListItem Value="-1">----</asp:ListItem>
                                    <asp:ListItem Value="0">Month</asp:ListItem>
                                    <asp:ListItem Value="1">At End</asp:ListItem>
                                    <asp:ListItem Value="2">At Travel</asp:ListItem>
                                </asp:DropDownList>
                        <asp:RequiredFieldValidator ID="requiredDDL" runat="server" ControlToValidate="ddl_PaymentMethod"
                            ErrorMessage="Please select" InitialValue="-1" Display="Dynamic"></asp:RequiredFieldValidator>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Value">
                    <ItemTemplate>
                        <asp:TextBox ID="txt_Value" runat="server" Width="58px" Text="0"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>


protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
 if (e.Row.RowType == DataControlRowType.DataRow)
 {
    CheckBox checkbox1 = (CheckBox)e.Row.FindControl("checkbox1");
    DropDownList ddl_PaymentMethod = (DropDownList)e.Row.FindControl("ddl_PaymentMethod");
    ddl_PaymentMethod.Attributes.Add("disabled", "disabled");

   checkbox1.Attributes.Add("onclick", "javascript:EnableCheckBox('" + ddl_PaymentMethod.ClientID + "','" + checkbox1.ClientID + "')"); 
 }
}

function EnableCheckBox(ddl, chk) {

  var ddl_PaymentMethod = document.getElementById(ddl);
  var _chkbox = document.getElementById(chk);
  if (_chkbox.checked) {
      ddl_PaymentMethod.disabled = false;
      validateCheckBox(ddl_PaymentMethod, true);
   }
   else { 
      ddl_PaymentMethod.disabled = true;
      validateCheckBox(ddl_PaymentMethod, false);
   }
}

function validateCheckBox(ddl, state) {
    ValidatorEnable(document.getElementById(ddl.id, state));             
}
+3
1

... GridView:

<asp:GridView ID="gv" runat="server" AutoGenerateColumns="False" DataKeyNames="Id"  OnRowDataBound="gv_RowDataBound">
        <Columns>
            <asp:BoundField DataField="ID" ControlStyle-Width="250px" HeaderText="ID" SortExpression="ID" />
            <asp:BoundField DataField="FirstName" ControlStyle-Width="250px" HeaderText="FirstName"
                SortExpression="FirstName" />
            <asp:BoundField DataField="LastName" ControlStyle-Width="250px" HeaderText="LastName"
                SortExpression="LastName" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:CheckBox ID="checkbox1" runat="server" />
                    <asp:DropDownList ID="drpPaymentMethod" runat="server">
                                <asp:ListItem Value="-1">----</asp:ListItem>
                                <asp:ListItem Value="0">Month</asp:ListItem>
                                <asp:ListItem Value="1">At End</asp:ListItem>
                                <asp:ListItem Value="2">At Travel</asp:ListItem>
                            </asp:DropDownList>
                    <asp:RequiredFieldValidator ID="rfv" InitialValue="-1" ControlToValidate="drpPaymentMethod" Enabled="false" Display="Static" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>

                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Value">
                <ItemTemplate>
                    <asp:TextBox ID="txt_Value" runat="server" Width="58px" Text="0"></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

CS:

protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            CheckBox checkbox1 = e.Row.FindControl("checkbox1") as CheckBox;
            RequiredFieldValidator rfv = e.Row.FindControl("rfv") as RequiredFieldValidator;
            DropDownList drpPaymentMethod = (DropDownList)e.Row.FindControl("drpPaymentMethod");
            // you can just pass "this" instead of "myDiv.ClientID" and get the ID from the DOM element
            checkbox1.Attributes.Add("onclick", "UpdateValidator('" + checkbox1.ClientID + "','" + drpPaymentMethod.ClientID + "','" + rfv.ClientID + "');");
            if (!checkbox1.Checked)
                drpPaymentMethod.Attributes.Add("disabled", "disabled");
        }
    }

JavaScript:

function UpdateValidator(chkID, drpID, validatorid) {
        //enabling the validator only if the checkbox is checked
        var enableValidator = $("#" + chkID).is(":checked");

        if (enableValidator)
            $('#' + drpID).removeAttr('disabled');
        else
            $('#' + drpID).attr('disabled', 'disabled');

        var vv = $('#' + validatorid).val();

        ValidatorEnable(document.getElementById(validatorid), enableValidator);
    }
+3

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