ASP.NET Tutorial/Validation/CustomValidator

Содержание

1 Create user control based on CustomValidator
2 CustomValidator for login page
3 CustomValidator for login page (VB)
4 Custom validator with Javascript
5 Performing validation against no particular field.
6 Use both client side and server side script to validate (VB.net)
7 Using the CustomValidator control to perform client-side validations
8 Using the CustomValidator control to perform server-side validations (C#)
9 Using the CustomValidator control to perform server-side validations (VB)
10 Validate a blank field
11 You can associate a custom validation function with the CustomValidator control.

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" />

Username:

           <asp:Textbox id="tbUserName" runat="server"/>

           <asp:CustomValidator runat="server"
              OnServerValidate="ValidateThis" 
              OnClientValiate="validateLength" 
              Display="Dynamic"
              ControlToValidate="tbUserName"
              ErrorMessage="The username must be 4 characters or longer"/>

Password:

         <asp:Textbox id="tbPassword" runat="server" TextMode="password" />

         <ASP:Button id="tbSubmit" runat="server" OnClick="Submit" text="Submit" />

</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:

       <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:

       <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:

   <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:

  <asp:TextBox ID="txtUser" runat="server"></asp:TextBox>
  

  Enter email:

  <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">

   <asp:Label
       id="lblQuestion"
       Text="What was Aristotle"s first name?"
       AssociatedControlID="txtAnswer"
       Runat="server" />
   

   <asp:TextBox
       id="txtAnswer"
       Runat="server" />
   <asp:CustomValidator
       id="valAnswer"
       Text="(You answered too slowly!)"
       OnServerValidate="valAnswer_ServerValidate"
       Runat="server" />
   


   <asp:Button
       id="btnSubmit"
       Text="Submit"
       Runat="server" />
   <asp:Button
       id="btnAgain"
       Text="Try Again!"
       CausesValidation="false"
       OnClick="btnAgain_Click"
       Runat="server" />

   </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" />

Username:

           <asp:Textbox id="tbUserName" runat="server" 
              />

           <asp:CustomValidator runat="server"
              OnServerValidate="ValidateThis" 
              OnClientValiate="validateLength" 
              Display="Dynamic"
              ControlToValidate="tbUserName"
              ErrorMessage="The username must be 8 characters or longer"/>

         <ASP:Button id="tbSubmit" runat="server" 
            OnClick="Submit" 
            text="Submit" />

  </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">

           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>

   </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">

           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>

   </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">

           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>

   </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">

   <asp:Label
       id="lblProductCode"
       Text="Product Code:"
       AssociatedControlID="txtProductCode"
       Runat="server" />
   

   <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" />

   </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">

   <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" />

   </form>

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

ASP.NET Tutorial/Validation/CustomValidator

Содержание

Create user control based on CustomValidator

CustomValidator for login page

CustomValidator for login page (VB)

Custom validator with Javascript

Performing validation against no particular field.

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

Using the CustomValidator control to perform client-side validations

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

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

Validate a blank field

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

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