在特定行的gridview内启用必需的字段验证器？

Question

I have implemented Grid View as below lines of code

<div  class="overflowX">
    <asp:GridView ID="grdView" AutoGenerateColumns="false" BorderWidth="0" OnRowCommand="grdView_RowCommand" runat="server" CssClass="table">
        <Columns>
            <asp:TemplateField HeaderText="Save It">
                <ItemTemplate>
                    <asp:CheckBox ID="chkbox" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Expiration Date">
                <ItemTemplate>
                    <asp:TextBox ID="txtExpirationDate" style="padding:12px 5px;" placeholder="(mm/dd/yyyy)" CssClass="datepiker" runat="server"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="ValReqExpD" Enabled="false" Display="Dynamic" runat="server" ErrorMessage="Expiry Date cannot be Blank." ControlToValidate="txtExpirationDate"></asp:RequiredFieldValidator>
                    <asp:RegularExpressionValidator Display="Dynamic" ID="ValRegExpD" runat="server" ControlToValidate="txtExpirationDate" ErrorMessage="Enter a valid Expiry Date ." ValidationExpression="([1-9]|0[1-9]|1[012])([-/.])([1-9]|0[1-9]|[12][0-9]|3[01])([-/.])(19[5-9][0-9]|20[0-4][0-9])">
                        <b>Enter a valid Renewal Date</b>
                    </asp:RegularExpressionValidator><br />
                    <asp:CompareValidator ID="ValCmpSD" Display="Dynamic" runat="server" ControlToCompare="txtEffectiveDate" ControlToValidate="txtExpirationDate" ErrorMessage="Expiry Date should be greater than Effective date" Operator="GreaterThan" Type="Date"></asp:CompareValidator>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

Now I want that When user will check boxes of a particular row, then the required feild validation "ValReqExpD" should be enabled in that particular row...

    protected void grdView_RowCommand(object sender, GridViewCommandEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.DataRow)
        {

            CheckBox chk = (CheckBox)e.Row.FindControl("chkbox");

            RequiredFieldValidator rfv = (RequiredFieldValidator)e.Row.FindControl("ValReqED");

            if (chk.Checked == false)
            {
                  rfv.Enabled = false;
            }
        }

    }

I have tried the above code but it is not working !!!

Please help me !!!

Answer 1

1. First you need to add server event on CheckBox control of Change event fire.
2. Then fire of checked event of Checkbox you need to enable/disable RequiredFieldValidator server control.

Answer 2

The probelm with your current code is that gridView's RowCommand event is raised when any event like button click etc is raised but since your Checkbox control is not doing anything this event will not trigger anything.

You can attach a CheckChanged event with your CheckBox control and enable autopostback like this:-

<asp:CheckBox ID="chkbox" runat="server" OnCheckedChanged="chkbox_CheckedChanged" 
     AutoPostBack="true"/>

Then in the code behind, find the RequiredFieldValidator (present inside the row in which the checkbox is checked) and enable it like this:-

protected void chkbox_CheckedChanged(object sender, EventArgs e)
{
   CheckBox chkbox= sender as CheckBox;
   GridViewRow currentRow = chkbox.NamingContainer as GridViewRow;
   RequiredFieldValidator rfv = grdCustomer.Rows[currentRow.RowIndex]
                                      .FindControl("ValReqED") as RequiredFieldValidator;
   if (chkCustomer.Checked)
   {
      rfv .Enabled = true;
   }
}