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How can you do ClientSide Validation?

Platform: ASP.NET| Category: Client Side Scripting

Client-side validation is enabled by default. If the client is capable, uplevel validation will be performed automatically. To disable client-side validation, set the page’s ClientTarget property to ‘Downlevel’ (‘Uplevel’ forces client-side validation). Alternatively, you can set an individual validator control’s EnableClientScript property to ‘false’ to disable client-side validation for that specific control.

<%@ Page ClientTarget=UpLevel %>
 
<html>
    <head>
        <script language="C#" runat=server>
 
            void Page_Load() 
            {
                if (!IsPostBack) 
                {
                                // Validate initially to force *s to appear before the first round-trip
                    Validate();
                }
            }
 
            void ValidateBtn_Click(Object Sender, EventArgs E) 
            {
                if (Page.IsValid == true) 
                {
                    lblOutput.Text = "Page is Valid!";
                }
                else
                {
                    lblOutput.Text = "Some of the required fields are empty";
                }
            }
 
        </script>
 
    </head>
    <body>
        <h3><font face="Verdana">Client-Side RequiredFieldValidator Sample</font></h3>
        <form runat="server">
            <table bgcolor="#eeeeee" cellpadding=10>
                <tr valign="top">
                    <td colspan=3>
                        <asp:Label ID="lblOutput" Name="lblOutput" Text="Fill in the required fields below"
                         ForeColor="red" Font-Names="Verdana" Font-Size="10" runat=server /><br>
                    </td>
                </tr>
                <tr>
                    <td colspan=3>
                        <font face=Verdana size=2><b>Credit Card Information</b></font>
                    </td>
                </tr>
                <tr>
                    <td align=right>
                        <font face=Verdana size=2>Card Type:</font>
                    </td>
                    <td>
                        <ASP:RadioButtonList id=RadioButtonList1 RepeatLayout="Flow"
                             onclick="ClientOnChange();" runat=server>
                            <asp:ListItem>MasterCard</asp:ListItem>
                                        <asp:ListItem>Visa</asp:ListItem>
                        </ASP:RadioButtonList>
                    </td>
                    <td align=middle rowspan=1>
                        <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server"
                            ControlToValidate="RadioButtonList1"
                            ErrorMessage="*"
                            Display="Static"
                            InitialValue=""
                            Width="100%">
                        </asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td align=right>
                        <font face=Verdana size=2>Card Number:</font>
                    </td>
                    <td>
                                <ASP:TextBox id=TextBox1 onchange="ClientOnChange();" runat=server />
                    </td>
                    <td>
                        <asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server"
                            ControlToValidate="TextBox1"
                            ErrorMessage="*"
                            Display="Static"
                            Width="100%">
                        </asp:RequiredFieldValidator>
     
                    </td>
                </tr>
                <tr>
                    <td align=right>
                        <font face=Verdana size=2>Expiration Date:</font>
                    </td>
                    <td>
                        <ASP:DropDownList id=DropDownList1 onchange="ClientOnChange();"
                         runat=server>
                            <asp:ListItem></asp:ListItem>
                            <asp:ListItem >06/00</asp:ListItem>
                            <asp:ListItem >07/00</asp:ListItem>
                            <asp:ListItem >08/00</asp:ListItem>
                            <asp:ListItem >09/00</asp:ListItem>
                            <asp:ListItem >10/00</asp:ListItem>
                            <asp:ListItem >11/00</asp:ListItem>
                            <asp:ListItem >01/01</asp:ListItem>
                            <asp:ListItem >02/01</asp:ListItem>
                            <asp:ListItem >03/01</asp:ListItem>
                            <asp:ListItem <04/01</asp:ListItem>
                            <asp:ListItem <05/01</asp:ListItem>
                            <asp:ListItem <06/01</asp:ListItem>
                            <asp:ListItem <07/01</asp:ListItem>
                            <asp:ListItem <08/01</asp:ListItem>
                            <asp:ListItem <09/01</asp:ListItem>
                            <asp:ListItem <10/01</asp:ListItem>
                            <asp:ListItem <11/01</asp:ListItem>
                            <asp:ListItem <12/01</asp:ListItem>
                        </ASP:DropDownList>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator id="RequiredFieldValidator3" runat="server"
                                    ControlToValidate="DropDownList1"
                            ErrorMessage="*"
                            Display="Static"
                            InitialValue=""
                            Width="100%">
                        </asp:RequiredFieldValidator>
                    </td>
                    <td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td>
                        <ASP:Button id=Button1 text="Validate" OnClick="ValidateBtn_Click"
                         runat="server" />
                    </td>
                    <td>
                    </td>
                </tr>
            </table>
        </form>
        <script language=javascript>
            <!--
            function ClientOnChange() 
            {
                if (typeof(Page_Validators) == "undefined")
                return;
                document.all["lblOutput"].innerText = Page_IsValid ? "Page is Valid!" : "Some of
                 the required fields are empty";
            }
            // -->
        </script>
    </body>
</html>

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