ASP.Net/Validation by Control/Required Field
Содержание
- 1 Checking Against an Initial Value with a RequiredFieldValidator Control (VB.net)
- 2 DropDownList Must Have a Value Selected Other Than the Default
- 3 Must enter: Required Field Validator (C#)
- 4 RequiredFieldValidator Demo: You must enter your name (VB.net)
- 5 Required field validator (VB.net)
- 6 Validation Control Example
Checking Against an Initial Value with a RequiredFieldValidator Control (VB.net)
<source lang="csharp">
<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Checking Against an Initial Value with a RequiredFieldValidator Control</TITLE>
</HEAD>
<form runat="server">
<asp:textbox
id="txtName" text="Enter Your Name" runat=server
/> <asp:RequiredFieldValidator
id="rfvName1" controltovalidate="txtName" InitialValue="Enter Your Name" display="Dynamic" font-name="Verdana" font-size="10pt" forecolor="red" runat=server
> You must enter your name! </asp:RequiredFieldValidator> <asp:requiredfieldvalidator
id="rfvName2" controltovalidate="txtName" display="Dynamic" font-name="Verdana" font-size="10pt" forecolor="red" runat=server
>
You must enter your name!
</asp:requiredfieldvalidator>
<asp:button
id="butOK" text="OK" type="Submit" runat="server"
/> </form> </BODY> </HTML>
</source>
DropDownList Must Have a Value Selected Other Than the Default
<source lang="csharp">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" runat="server" ValidationGroup="DDL">
<asp:ListItem>--Please Select--</asp:ListItem>
<asp:ListItem>Red</asp:ListItem>
<asp:ListItem>Green</asp:ListItem>
<asp:ListItem>Blue</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2"
runat="server"
ControlToValidate="DropDownList1"
ErrorMessage="DropDownList1 Must Have a Value Selected"
InitialValue="--Please Select--"
SetFocusOnError="True"
ValidationGroup="DDL">*</asp:RequiredFieldValidator>
</form>
</body> </html>
</source>
Must enter: Required Field Validator (C#)
<source lang="csharp">
<%@Page Language="C#"%> <html> <body> <form runat="server"> <asp:textbox id="txtTest" text="delete this" runat="server" /> <asp:RequiredFieldValidator id="valRequired" runat="server"
ErrorMessage="* You must enter a value in the text box"
ControlToValidate="txtTest"
Display="dynamic">
</asp:RequiredFieldValidator>
<asp:button text="Validate" runat="server" />
<asp:ValidationSummary id="valSummary" runat="server"
HeaderText="The following errors were found:"
ShowSummary="true"
DisplayMode="List" />
</form> </body> </html>
</source>
RequiredFieldValidator Demo: You must enter your name (VB.net)
<source lang="csharp">
<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<script runat=server>
</SCRIPT>
<HTML>
<HEAD>
<TITLE>RequiredFieldValidator Control Sample Page</TITLE>
</HEAD>
<BODY >
<form runat="server">
<asp:Label
id="lblMessage" runat="server" Font-Bold="True" Text="Name"
/> <asp:TextBox
id="txtName" Columns="25" MaxLength="30" runat=server Text="Name"
/> <asp:RequiredFieldValidator
id="rfvName" ControlToValidate="txtName" InitialValue="Name" Display="Dynamic" Font-Name="Verdana" Font-Size="10pt" runat=server
>
You must enter your name!
</asp:RequiredFieldValidator>
<asp:Label
id="lblMessage2" runat="server" Font-Bold="True" Text="Name 2"
/> <asp:TextBox
id="txtName2" Columns="25" MaxLength="30" runat=server Text="Name"
/> <asp:RequiredFieldValidator
id="rfvName2" ControlToValidate="txtName2" InitialValue="Name" Display="Dynamic" Font-Name="Verdana" Font-Size="10pt" runat=server
> You must replace name with your name! </asp:RequiredFieldValidator> <asp:RequiredFieldValidator
id="rfvName3" ControlToValidate="txtName2" Display="Dynamic" Font-Name="Verdana" Font-Size="10pt" runat=server
>
You must enter a name!
</asp:RequiredFieldValidator>
<asp:button
id="butOK" text="OK" Type="Submit" runat="server"
/> </Form> </BODY> </HTML>
</source>
Required field validator (VB.net)
<source lang="csharp">
<%@ Page Language="vb" %> <html> <head>
<title>Validation Control Example</title>
<script language="javascript">
</script>
<script runat="server">
Sub Page_Load()
vsSummary.DisplayMode = ValidationSummaryDisplayMode.List
End Sub
Sub ServerValidation (source As object, args As ServerValidateEventArgs)
Dim RegExVal As New System.Text.RegularExpressions.Regex("^\d{4}$")
If RegExVal.IsMatch(args.Value) Then
args.IsValid = True
Else
args.IsValid = False
End If
End Sub
</script>
</head> <body>
Validation Control Example
<form runat="server">
<asp:table id="MyTable" border="1" cellpadding="5" cellspacing="0" runat="server">
<asp:tablerow runat="server">
<asp:tablecell runat="server">
RegularExpressionValidator Control:
Enter a valid 5 or 9-digit zip code
</asp:tablecell>
<asp:tablecell runat="server">
<asp:textbox id="zipcode" runat="server"/>
<asp:regularexpressionvalidator id="reZipCode"
controltovalidate="zipcode"
validationexpression="^\d{5}$|^\d{5}-\d{4}$"
errormessage="Not a valid Zip code!"
display="static"
runat="server"/>
</asp:tablecell>
</asp:tablerow>
<asp:tablerow runat="server">
<asp:tablecell runat="server">
RequiredFieldValidator Control:
Enter a login name
</asp:tablecell>
<asp:tablecell runat="server">
<asp:textbox id="login" runat="server"/>
<asp:requiredfieldvalidator id="rfvLogin"
controltovalidate="login"
display="static"
errormessage="Login cannot be blank!"
runat="server"/>
</asp:tablecell>
</asp:tablerow>
<asp:tablerow runat="server">
<asp:tablecell runat="server">
ValidationSummary Control:
</asp:tablecell>
<asp:tablecell runat="server">
<asp:validationsummary id="vsSummary"
displaymode="bulletlist"
headertext="Page has the following errors: "
showsummary="true"
showmessagebox="false"
runat="server"/>
</asp:tablecell>
</asp:tablerow>
<asp:tablerow runat="server">
<asp:tablecell colspan="2" runat="server">
<asp:button text="submit" runat="server"/>
</asp:tablecell>
</asp:tablerow>
</asp:table>
<asp:label id="MyLabel" runat="server"/>
</form>
</body> </html>
</source>
Validation for aspText: cannot be empty, integer range (MaximumValue,MinimumValue) (VB.net)
<source lang="csharp">
<%@ Page Language="VB" %> <html> <head> </head> <body>
<form runat="server">
Name: <asp:TextBox id="TextBox1" runat="server"></asp:TextBox> <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ErrorMessage="You must enter your name" ControlToValidate="TextBox1">Missing name </asp:RequiredFieldValidator>
Age: <asp:TextBox id="TextBox2" runat="server"></asp:TextBox> <asp:RangeValidator id="RangeValidator1" runat="server" ErrorMessage="Age must be between 18 and 75" ControlToValidate="TextBox2" MaximumValue="75" MinimumValue="18" Type="Integer">18 - 75 </asp:RangeValidator>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
<asp:ValidationSummary id="ValidationSummary1" runat="server"> </asp:ValidationSummary>
</form>
</body> </html>
</source>
