CustomValidator 類

時間 2019-11-10

標籤 customvalidator 简体版

原文原文鏈接

CustomValidator 類：對輸入控件執行用戶定義的驗證。javascript

ClientValidationFunction 獲取或設置用於驗證的自定義客戶端腳本函數的名稱。html

ControlToValidate 獲取或設置要驗證的輸入控件。（繼承自 BaseValidator。）java

ErrorMessage 獲取或設置驗證失敗時 ValidationSummary 控件中顯示的錯誤消息的文本。（繼承自 BaseValidator。）web

IsValid 獲取或設置一個值，該值指示關聯的輸入控件是否經過驗證。（繼承自 BaseValidator。）函數

事件

OnServerValidate 爲 CustomValidator 控件引起 ServerValidate 事件。ui

該檢驗類有一個ClientValidationFunction表示能夠使用用戶自定義的客戶端腳本函數，採用如下方式來進行定義spa

function ValidationFunctionName(source, arguments)

 arguments參數是一個具備如下兩個屬性的對象：Value 和 IsValid。 使用此參數能夠獲取控件的值，以根據自定義驗證例程驗證並指示該值是否有效。

ServerValidate一樣須要須要定義相應的事件，定義的格式以下

void ServerValidation (object source, ServerValidateEventArgs args)
 {
    args.IsValid = (CheckBox1.Checked == true);
 }

服務端校驗

<%@ Page Language="C#" AutoEventWireup="True" %>

<!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>
    <title>CustomValidator ServerValidate Example</title>
<script runat="server">

      void ValidateBtn_OnClick(object sender, EventArgs e) 
      { 

         // Display whether the page passed validation.
         if (Page.IsValid) 
         {

            Message.Text = "Page is valid.";

         }

         else 
         {

            Message.Text = "Page is not valid!";

         }

      }

      void ServerValidation(object source, ServerValidateEventArgs args)
      {

         try 
         {

            // Test whether the value entered into the text box is even.
            int i = int.Parse(args.Value);
            args.IsValid = ((i%2) == 0);

         }

         catch(Exception ex)
         {

            args.IsValid = false;

         }

      }

   </script>    

</head>
<body>

   <form id="form1" runat="server">

      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"  
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1"/>

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />

      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           OnServerValidate="ServerValidation"
           runat="server"/>

      <br />

      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

   </form>

</body>
</html>

客戶端檢驗：code

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>

   <script runat="server">

      void ValidateBtn_OnClick(object sender, EventArgs e) 
      { 
         // Display whether the page passed validation.
         if (Page.IsValid) 
         {
            Message.Text = "Page is valid.";
         }

         else 
         {
            Message.Text = "Page is not valid!";
         }
      }

      void ServerValidation(object source, ServerValidateEventArgs args)
      {
         try 
         {
            // Test whether the value entered into the text box is even.
            int i = int.Parse(args.Value);
            args.IsValid = ((i%2) == 0);
         }

         catch(Exception ex)
         {
            args.IsValid = false;
         }
      }

   </script>    

</head>
<body>

   <form id="Form1" runat="server">

      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"  
           Text="Enter an even number:" 
           Font-Name="Verdana" 
           Font-Size="10pt" 
           runat="server"/>

      <p>

      <asp:TextBox id="Text1" 
           runat="server" />

      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           ClientValidationFunction="ClientValidate"
           OnServerValidate="ServerValidation"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Name="verdana" 
           Font-Size="10pt"
           runat="server"/>

      <p>

      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

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

<script language="javascript"> 
   function ClientValidate(source, arguments)
   {
        if (arguments.Value % 2 == 0 ){
            arguments.IsValid = true;
        } else {
            arguments.IsValid = false;
        }
   }
</script>

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