Hi all I need your helpI need set enabled equal to true the RequiredFieldValidator rftxt when at least one of the three DropDownLists contains KO valueI dont have error but the RequiredFieldValidator rftxt remains disabledMy code belowltaspTemplateField HeaderText34t134 ItemStyleCssClass34ddlClassnew34 ItemStyleHorizontalAlign34Center34gt ltItemTemplategt ltdivgt ltaspDropDownList ID34ddl134 runat34server

Refer below codeHTMLltaspGridView ID34gridview34 runat34server34 AutoGenerateColumns34false34gt ltColumnsgt ltaspTemplateField HeaderText34t134 ItemStyleCssClass34ddlClassnew34 ItemStyleHorizontalAlign34Center34gt ltItemTemplategt ltdivgt ltaspDropDownList ID34ddl134 runat34server34 AutoPostBack34true34 OnSelectedIndexChanged34OnSelectedIndexChanged34 BackColor34Yellow34 CssClass34ddlClassnew34gt ltaspListItem Text34 34 Value3434gtltaspListItemgt ltaspListItem Text34OK34 Value34OK34gtltaspListItemgt ltaspListItem Text34KO34 Value34KO34gtltaspListItemgt ltaspDropDownListgt ltdivgt

Enable Disable ASP.Net RequiredFieldValidator in ASP.Net GridView based on DropDownList using C#

Vincenzo...

SOLVED CLOSED ACTIVE ANSWERED
User: Vincenzo67
Posted: on Oct 26, 2023 04:46 AM
Forum: Data Controls
Answer: 1
Views: 863
Sample Code: Download

Hi all, I need your help.

I need set enabled equal to true the RequiredFieldValidator "rftxt" when at least one of the three DropDownLists contains KO value.

I don't have error but the RequiredFieldValidator "rftxt" remains disabled.

My code below

<asp:TemplateField
    HeaderText="t1"
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <div>
            <asp:DropDownList ID="ddl1" runat="server"
                AutoPostBack="true"
                OnSelectedIndexChanged="OnSelectedIndexChanged"
                BackColor="Yellow"
                CssClass="ddl_Class_new">
                <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
            </asp:DropDownList>
        </div>
        <br />
    </ItemTemplate>
</asp:TemplateField>
 
<asp:TemplateField
    HeaderText="t2"
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <div>
            <asp:DropDownList ID="ddl2" runat="server"
                AutoPostBack="true"
                OnSelectedIndexChanged="OnSelectedIndexChanged"
                BackColor="Yellow"
                CssClass="ddl_Class_new">
                <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
            </asp:DropDownList>
        </div>
        <br />
    </ItemTemplate>
</asp:TemplateField>
 
<asp:TemplateField
    HeaderText="t3"
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <div>
            <asp:DropDownList ID="ddl3" runat="server"
                AutoPostBack="true"
                OnSelectedIndexChanged="OnSelectedIndexChanged"
                BackColor="Yellow"
                CssClass="ddl_Class_new">
                <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
            </asp:DropDownList>
        </div>
        <br />
    </ItemTemplate>
</asp:TemplateField>
 
<asp:TemplateField
    HeaderText="Note"
    ItemStyle-CssClass="ddl_Class_new"
    ItemStyle-HorizontalAlign="Center">
    <ItemTemplate>
        <div>
            <br />
            <asp:TextBox ID="t_txt" runat="server"
                CssClass="ddl_Class_new"
                TextMode="MultiLine"
                Enabled="true"></asp:TextBox>
            <asp:RequiredFieldValidator ID="rftxt" runat="server"
                ControlToValidate="t_txt"
                Enabled="false"
                SetFocusOnError="true"
                ErrorMessage="Insert value"
                Display="None"
                ValidationGroup="Validation2"
                CssClass="validation-summary-errors-one"></asp:RequiredFieldValidator>
        </div>
    </ItemTemplate>
</asp:TemplateField>
 
<asp:ImageButton ID="btn"
    ImageUrl="/aspnet/img/btn.gif"
    ValidationGroup="Validation2"
    runat="server"
    OnClick="btn_Click"
    OnClientClick="return confirm('Are you sure?')"
    CssClass="ddl_Class_new"
    Visible="true" />

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList ddl = (DropDownList)sender;
    GridViewRow row = (GridViewRow)ddl.NamingContainer;
 
    DropDownList t1 = (DropDownList)row.FindControl("ddl1");
    DropDownList t2 = (DropDownList)row.FindControl("ddl2");
    DropDownList t3 = (DropDownList)row.FindControl("ddl3");
    TextBox t_txt = (TextBox)row.FindControl("txt");
    RequiredFieldValidator t_rftxt = (RequiredFieldValidator)row.FindControl("rftxt");
 
    string sp_t1 = t1.SelectedValue;
    string sp_t2 = t2.SelectedValue;
    string sp_t3 = t3.SelectedValue;
 
    if (sp_t1.ToString() == "KO" || sp_t2.ToString() == "KO" || sp_t3.ToString() == "KO")
    {
        t_rftxt.Enabled = true;
    }
    else
    {
       // ...
    }
}

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dharmend...

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ANSWER
User: dharmendr
Replied: on Oct 26, 2023 05:53 AM
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Refer below code.

HTML

<asp:GridView ID="gridview" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField HeaderText="t1" ItemStyle-CssClass="ddl_Class_new" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <div>
                    <asp:DropDownList ID="ddl1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnSelectedIndexChanged"
                        BackColor="Yellow" CssClass="ddl_Class_new">
                        <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                        <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                        <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
                    </asp:DropDownList>
                </div>
                <br />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="t2" ItemStyle-CssClass="ddl_Class_new" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <div>
                    <asp:DropDownList ID="ddl2" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnSelectedIndexChanged"
                        BackColor="Yellow" CssClass="ddl_Class_new">
                        <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                        <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                        <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
                    </asp:DropDownList>
                </div>
                <br />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="t3" ItemStyle-CssClass="ddl_Class_new" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <div>
                    <asp:DropDownList ID="ddl3" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnSelectedIndexChanged"
                        BackColor="Yellow" CssClass="ddl_Class_new">
                        <asp:ListItem Text="[ === === === ]" Value=""></asp:ListItem>
                        <asp:ListItem Text="OK" Value="OK"></asp:ListItem>
                        <asp:ListItem Text="KO" Value="KO"></asp:ListItem>
                    </asp:DropDownList>
                </div>
                <br />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Note" ItemStyle-CssClass="ddl_Class_new" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <div>
                    <br />
                    <asp:TextBox ID="t_txt" runat="server" CssClass="ddl_Class_new" TextMode="MultiLine"
                        Enabled="true"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="rftxt" runat="server" ControlToValidate="t_txt" Enabled="false"
                        SetFocusOnError="true" ErrorMessage="Insert value" Display="None" ValidationGroup="Validation2"
                        CssClass="validation-summary-errors-one"></asp:RequiredFieldValidator>
                    <%--<asp:ValidationSummary ID="Validation2" ValidationGroup="Validation2" runat="server"
                        ShowMessageBox="true" CssClass="validation-summary-errors" ShowSummary="false" />--%>
                </div>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:ImageButton ID="btn" ImageUrl="/aspnet/img/btn.gif" ValidationGroup="Validation2"
                    runat="server" OnClick="btn_Click" CssClass="ddl_Class_new" Visible="true" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[1] { new DataColumn("ID") });
        dt.Rows.Add("101");
        dt.Rows.Add("102");
        gridview.DataSource = dt;
        gridview.DataBind();
    }
}

protected void OnSelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList ddl = (DropDownList)sender;
    GridViewRow row = (GridViewRow)ddl.NamingContainer;

    DropDownList t1 = (DropDownList)row.FindControl("ddl1");
    DropDownList t2 = (DropDownList)row.FindControl("ddl2");
    DropDownList t3 = (DropDownList)row.FindControl("ddl3");
    TextBox t_txt = (TextBox)row.FindControl("txt");
    RequiredFieldValidator t_rftxt = (RequiredFieldValidator)row.FindControl("rftxt");

    string sp_t1 = t1.SelectedValue;
    string sp_t2 = t2.SelectedValue;
    string sp_t3 = t3.SelectedValue;

    if (sp_t1.ToUpper() == "KO" || sp_t2.ToUpper() == "KO" || sp_t3.ToUpper() == "KO")
    {
        t_rftxt.Enabled = true;
    }
    else
    {
        t_rftxt.Enabled = false;
    }
}

protected void btn_Click(object sender, EventArgs e)
{

}

Screenshot

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Enable Disable ASP.Net RequiredFieldValidator in ASP.Net GridView based on DropDownList using C#

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