в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:57:50Z

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== Create user control based on CustomValidator==



<source lang="csharp">
<%@ Page Language="VB" %>
<%@ Register TagPrefix="nfexASP" TagName="LoginForm" src="Control.ascx" %>
<html><body>
<form runat="server">
<nfexASP:LoginForm id="LoginForm1" runat="server"/>
</form>

<asp:Label id="lblMessage" runat="server" />
</body></html>

File: Control.ascx
<script runat="server">
sub Submit(Sender as Object, e as EventArgs)
if Page.IsValid then
"do something
end if
end sub
sub ValidateThis(Sender as Object, args as _
ServerValidateEventArgs)
if len(args.Value) < 4 then
args.IsValid = false
else
args.IsValid = true
end if
end sub
</script>
<asp:Label id="lblMessage" runat="server" />
<table>
<tr>
<td valign="top">Username:</td>
<td valign="top">
<asp:Textbox id="tbUserName" runat="server"/><br>
<asp:CustomValidator runat="server"
OnServerValidate="ValidateThis"
OnClientValiate="validateLength"
Display="Dynamic"
ControlToValidate="tbUserName"
ErrorMessage="The username must be 4 characters or longer"/>
</td>
</tr>
<tr>
<td valign="top">Password:</td>
<td valign="top">
<asp:Textbox id="tbPassword" runat="server" TextMode="password" />
</td>
</tr>
<tr>
<td align="right">
<ASP:Button id="tbSubmit" runat="server" OnClick="Submit" text="Submit" />
</td>
</tr>
</table></source>

== CustomValidator for login page==



<source lang="csharp">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>CustomValidator Control Sample</title>
<script runat="server" language="C#">
void CheckUniqueUserName(Object s, ServerValidateEventArgs e)
{
string username = e.Value.ToLower();
if(username == "user" || username == "password")
{
e.IsValid = false;
}
}

void submitButton_Click(Object s, EventArgs e)
{
if(Page.IsValid)
{
submitButton.Text = "Valid";
}
else
{
submitButton.Text = "Invalid!";
}
}
</script>
</head>
<body>
<form runat="server">

New Username:<br />
<asp:TextBox ID="usernameTextBox" runat="server" />
<asp:CustomValidator ID="usernameUnique" runat="server"
ControlToValidate="usernameTextBox"
OnServerValidate="CheckUniqueUserName"
ErrorMessage="This username already taken!" />

<asp:Button ID="submitButton" runat="server"
OnClick="submitButton_Click" Text="Submit" />

</form>
</body>
</html></source>

== CustomValidator for login page (VB)==



<source lang="csharp">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>CustomValidator Control Sample</title>
<script runat="server" language="VB">
Sub CheckUniqueUserName(s As Object, _
e As ServerValidateEventArgs)
Dim username As String = e.Value.ToLower
If (username = "user" Or username = "password") Then
e.IsValid = False
End If
End Sub

Sub submitButton_Click(s As Object, e As EventArgs)
If Page.IsValid Then
submitButton.Text = "Valid"
Else
submitButton.Text = "Invalid!"
End If
End Sub
</script>
</head>
<body>
<form id="Form1" runat="server">

New Username:<br />
<asp:TextBox ID="usernameTextBox" runat="server" />
<asp:CustomValidator ID="usernameUnique" runat="server"
ControlToValidate="usernameTextBox"
OnServerValidate="CheckUniqueUserName"
ErrorMessage="This username already taken!" />

<asp:Button ID="submitButton" runat="server"
OnClick="submitButton_Click" Text="Submit" />

</form>
</body>
</html></source>

== Custom validator with Javascript==



<source lang="csharp">
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingCustomValidator" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Using a CustomValidator</title>
</head>
<body>
<form id="form1" runat="server">

Enter a date:<br />
<asp:TextBox ID="txtDate" runat="server"></asp:TextBox>
<asp:CustomValidator ID="custDate" runat="server"
ControlToValidate="txtDate"
ValidateEmptyText="false"
Text="Enter a valid future date"
OnServerValidate="custDate_ServerValidate" />

<script type="text/javascript">
function validateOrFields(source, args){
var sUser = document.form1.<%= txtUser.ClientID %>.value;
var sEmail = document.form1.<%= txtEmail.ClientID %>.value;

if (sUser == "" && sEmail == "")
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
return;
}
</script>

Enter user name:<br />
<asp:TextBox ID="txtUser" runat="server"></asp:TextBox>
<br />
Enter email:<br />
<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
<asp:CustomValidator ID="OrFieldValidator"
runat="server"
Text="Enter either a user name or a email"
ClientValidationFunction="validateOrFields"
OnServerValidate="OrFieldValidator_ServerValidate" />

<asp:Button ID="btnSubmit" Text="Click this to test validation" runat="server" />

</form>
</body>
</html>
<script type="text/javascript">
ValidatorHookupControlID("<%= txtUser.ClientID %>",document.getElementById("<%= OrFieldValidator.ClientID %>"));
ValidatorHookupControlID("<%= txtEmail.ClientID %>",document.getElementById("<%= OrFieldValidator.ClientID %>"));
</script>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class UsingCustomValidator : System.Web.UI.Page
{
protected void custDate_ServerValidate(object source, ServerValidateEventArgs args)
{
string sEnteredDate = args.Value;
DateTime dt;
bool convertSuccessful = DateTime.TryParse(sEnteredDate, out dt);
if (convertSuccessful && dt >= DateTime.Today)
args.IsValid = true;
else
args.IsValid = false;
}
protected void OrFieldValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
if (txtUser.Text.Length <= 0 && txtEmail.Text.Length <= 0)
args.IsValid = false;
else
args.IsValid = true;
}
}</source>

== Performing validation against no particular field.==



<source lang="csharp">
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load()
{
if (!Page.IsPostBack)
ResetStartTime();
}
void btnAgain_Click(Object sender, EventArgs e)
{
ResetStartTime();
}
void ResetStartTime()
{
Session["StartTime"] = DateTime.Now;
}

void valAnswer_ServerValidate(Object source, ServerValidateEventArgs args)
{
DateTime startTime = (DateTime)Session["StartTime"];
if (startTime.AddSeconds(5) > DateTime.Now)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Timed Test</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblQuestion"
Text="What was Aristotle"s first name?"
AssociatedControlID="txtAnswer"
Runat="server" />
<br />
<asp:TextBox
id="txtAnswer"
Runat="server" />
<asp:CustomValidator
id="valAnswer"
Text="(You answered too slowly!)"
OnServerValidate="valAnswer_ServerValidate"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
<asp:Button
id="btnAgain"
Text="Try Again!"
CausesValidation="false"
OnClick="btnAgain_Click"
Runat="server" />
</div>
</form>
</body>
</html></source>

== Use both client side and server side script to validate (VB.net)==



<source lang="csharp">
<%@ Page Language="VB" %>
<script runat="server">
sub Submit(Sender as Object, e as EventArgs)
if Page.IsValid then
lblMessage.Text = "It"s all good!"
end if
end sub

sub ValidateThis(Sender as Object, args as _
ServerValidateEventArgs)
if len(args.Value) < 8 then
args.IsValid = false
else
args.IsValid = true
end if
end sub
</script>
<script language="JavaScript">
function validateLength( oSrc, txtValue ){
var retValue = true;
if(txtValue.length < 8){
retValue = false;
}
return retValue
}
</script>
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server" />
<table>
<tr>
<td valign="top">Username:</td>
<td valign="top">
<asp:Textbox id="tbUserName" runat="server"
/><br>
<asp:CustomValidator runat="server"
OnServerValidate="ValidateThis"
OnClientValiate="validateLength"
Display="Dynamic"
ControlToValidate="tbUserName"
ErrorMessage="The username must be 8 characters or longer"/>
</td>
</tr>
<tr>
<td align="right" colspan="2">
<ASP:Button id="tbSubmit" runat="server"
OnClick="Submit"
text="Submit" />
</td>
</tr>
</table>
</form>
</body></html></source>

== Using the CustomValidator control to perform client-side validations==



<source lang="csharp">
<%@ Page Language="C#" %>
<script runat="server">
protected void Button1_Click(Object sender, EventArgs e) {
Label1.Text = "VALID NUMBER!";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CustomValidator</title>
<script language="JavaScript">
function validateNumber(oSrc, args) {
args.IsValid = (args.Value % 5 == 0);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>

Number:
<asp:TextBox ID="TextBox1"
Runat="server"></asp:TextBox>
 
<asp:CustomValidator ID="CustomValidator1"
Runat="server" ControlToValidate="TextBox1"
ErrorMessage="Number must be divisible by 5"
ClientValidationFunction="validateNumber">
</asp:CustomValidator>

<asp:Button ID="Button1" OnClick="Button1_Click"
Runat="server" Text="Button"></asp:Button>

<asp:Label ID="Label1" Runat="server"></asp:Label>

</div>
</form>
</body>
</html></source>

== Using the CustomValidator control to perform server-side validations (C#)==



<source lang="csharp">
<%@ Page Language="C#" %>
<script runat="server">
protected void Button1_Click(Object sender, EventArgs e) {
if (Page.IsValid) {
Label1.Text = "VALID ENTRY!";
}
}
void ValidateNumber(object source, ServerValidateEventArgs args)
{
try
{
int num = int.Parse(args.Value);
args.IsValid = ((num%5) == 0);
}
catch(Exception ex)
{
args.IsValid = false;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CustomValidator</title>
</head>
<body>
<form id="form1" runat="server">
<div>

Number:
<asp:TextBox ID="TextBox1"
Runat="server"></asp:TextBox>
 
<asp:CustomValidator ID="CustomValidator1"
Runat="server" ControlToValidate="TextBox1"
ErrorMessage="Number must be divisible by 5"
OnServerValidate="ValidateNumber"></asp:CustomValidator>

<asp:Button ID="Button1" OnClick="Button1_Click"
Runat="server" Text="Button"></asp:Button>

<asp:Label ID="Label1" Runat="server"></asp:Label>

</div>
</form>
</body>
</html></source>

== Using the CustomValidator control to perform server-side validations (VB)==



<source lang="csharp">
<%@ Page Language="VB" %>
<script runat="server">
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If Page.IsValid Then
Label1.Text = "VALID ENTRY!"
End If
End Sub
Sub ValidateNumber(sender As Object, args As ServerValidateEventArgs)
Try
Dim num As Integer = Integer.Parse(args.Value)
args.IsValid = ((num mod 5) = 0)
Catch ex As Exception
args.IsValid = False
End Try
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CustomValidator</title>
</head>
<body>
<form id="form1" runat="server">
<div>

Number:
<asp:TextBox ID="TextBox1"
Runat="server"></asp:TextBox>
<asp:CustomValidator ID="CustomValidator1"
Runat="server" ControlToValidate="TextBox1"
ErrorMessage="Number must be divisible by 5"
OnServerValidate="ValidateNumber"></asp:CustomValidator>

<asp:Button ID="Button1" OnClick="Button1_Click"
Runat="server" Text="Button"></asp:Button>

<asp:Label ID="Label1" Runat="server"></asp:Label>

</div>
</form>
</body>
</html></source>

== Validate a blank field==



<source lang="csharp">
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void valProductCode_ServerValidate(Object source, ServerValidateEventArgs args)
{
if (args.Value.Length == 4)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Validate Empty Text</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblProductCode"
Text="Product Code:"
AssociatedControlID="txtProductCode"
Runat="server" />
<br />
<asp:TextBox
id="txtProductCode"
Runat="server" />
<asp:CustomValidator
id="valProductCode"
ControlToValidate="txtProductCode"
Text="(Invalid product code)"
ValidateEmptyText="true"
OnServerValidate="valProductCode_ServerValidate"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html></source>

== You can associate a custom validation function with the CustomValidator control.==



<source lang="csharp">
ControlToValidate: The ID of the form field being validated.
Text: The error message.

ClientValidationFunction: The name of a client-side function.
ServerValidate: This event raised when the CustomValidator performs validation.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void valComments_ServerValidate(Object source, ServerValidateEventArgs args)
{
if (args.Value.Length > 10)
args.IsValid = false;
else
args.IsValid = true;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show CustomValidator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblComments"
Text="Comments:"
AssociatedControlID="txtComments"
Runat="server" />
<asp:TextBox
id="txtComments"
TextMode="MultiLine"
Columns="30"
Rows="5"
Runat="server" />
<asp:CustomValidator
id="valComments"
ControlToValidate="txtComments"
Text="(Comments must be less than 10 characters)"
OnServerValidate="valComments_ServerValidate"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html></source>

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ASP.NET Tutorial/Validation/CustomValidator - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия