RequiredFieldValidator 類別

提供控制項功能，驗證相關輸入控制項的值是否與其初始值不同。

public class System.Web.UI.MobileControls.RequiredFieldValidator : 
   System.Web.UI.MobileControls.BaseValidator

備註

這個類別與 ASP.NET System.Web.UI.WebControls.RequiredFieldValidator 控制項的行為相同。

依預設值，表單上的 Command 控制項會引發表單上的驗證程式控制項，在表單呈送至伺服器時執行驗證。若要停用自動驗證，請將 Command 控制項上的 CausesValidation 屬性設定為 false。

範例

下列的程式碼範例要求使用者輸入 1 至 23 的數字。它同時使用 RangeValidator Control 控制項和 RequiredFieldValidator 控制項以驗證使用者的輸入。

<%@ Page Inherits=
   "System.Web.UI.MobileControls.MobilePage" Language="VB" %>
<%@ Register TagPrefix="mobile"
    Namespace="System.Web.UI.MobileControls"
    Assembly="System.Web.Mobile" %>

<script language="vb" runat="server">

Sub Page_Load(sender As Object, e As EventArgs)
   If Not IsPostBack Then
      Valid1.ControlToValidate = "TextBox1"
      Valid1.Type = ValidationDataType.Integer
      Valid1.MaximumValue = "23"
      Valid1.MinimumValue = "1"
   End If
End Sub

Protected Sub Submit_Click(sender As Object, e As EventArgs)
   If Page.IsValid Then
      ActiveForm = Form2
   End If
End Sub

</script>

<mobile:Form id="Form1" runat="server">
  <mobile:Label runat="server">
   Please enter an integer from 1 through 23
  </mobile:Label>
  
  <mobile:TextBox id="TextBox1" runat="server"/>

   <mobile:RangeValidator id="Valid1" runat="server">
      Invalid number
   </mobile:RangeValidator>

   <mobile:RequiredFieldValidator ControlToValidate="TextBox1" 
      runat="server">
      A number is required
   </mobile:RequiredFieldValidator>

   <mobile:Command runat="server" OnClick="Submit_Click">
      Submit
   </mobile:Command>

</mobile:Form>

<mobile:Form id="Form2" runat="server">
   <mobile:Label runat="server">Number is submitted</mobile:Label>
</mobile:Form>
[C#]
<%@ Page Inherits=
   "System.Web.UI.MobileControls.MobilePage" Language="C#" %>
<%@ Register TagPrefix="mobile"
    Namespace="System.Web.UI.MobileControls"
    Assembly="System.Web.Mobile" %>

<script language="c#" runat="server">

void Page_Load(Object sender, EventArgs e)
{
   if (!IsPostBack)
   {
      Valid1.ControlToValidate = "TextBox1";
      Valid1.Type = ValidationDataType.Integer;
      Valid1.MaximumValue = "23";
      Valid1.MinimumValue = "1";
   }
}

protected void Submit_Click(Object sender, EventArgs e)
{
   if (Page.IsValid)
   {
      ActiveForm = Form2;
   }
}

</script>

<mobile:Form id="Form1" runat="server">
  <mobile:Label runat="server">
   Please enter an integer from 1 through 23
  </mobile:Label>
  
  <mobile:TextBox id="TextBox1" runat="server"/>

   <mobile:RangeValidator id="Valid1" runat="server">
      Invalid number
   </mobile:RangeValidator>

   <mobile:RequiredFieldValidator ControlToValidate="TextBox1" 
      runat="server">
      A number is required
   </mobile:RequiredFieldValidator>

   <mobile:Command runat="server" OnClick="Submit_Click">
      Submit
   </mobile:Command>

</mobile:Form>

<mobile:Form id="Form2" runat="server">
   <mobile:Label runat="server">Number is submitted</mobile:Label>
</mobile:Form>

需求

命名空間：System.Web.UI.MobileControls

**組件：**System.Web.Mobile

請參閱

RequiredFieldValidator 控制項 | BaseValidator 類別 | CompareValidator 類別 | CustomValidator 類別 | RangeValidator 類別 | RegularExpressionValidator 類別 | ValidationSummary 類別