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TextBox.AutoPostBack 屬性

定義

取得或設定值,這個值表示是否要在 TextBox 控制項失去焦點時自動回傳至伺服器。

public:
 virtual property bool AutoPostBack { bool get(); void set(bool value); };
public virtual bool AutoPostBack { get; set; }
[System.Web.UI.Themeable(false)]
public virtual bool AutoPostBack { get; set; }
member this.AutoPostBack : bool with get, set
[<System.Web.UI.Themeable(false)>]
member this.AutoPostBack : bool with get, set
Public Overridable Property AutoPostBack As Boolean

屬性值

如果要在 TextBox 控制項失去焦點時自動回傳則為 true,否則為 false。 預設為 false

屬性

範例

下列範例示範如何使用 AutoPostBack 屬性,在控件失去焦點時 TextBox ,自動顯示文字框中輸入的值總和。

重要

這個範例有一個可接受使用者輸入的文字方塊,這可能會造成安全性威脅。 根據預設,ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。 如需詳細資訊,請參閱 Script Exploits Overview (指令碼攻擊概觀)。

<%@ 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> TextBox Example </title>
<script runat="server">

      protected void Page_Load(Object sender, EventArgs e)
      {
         int Answer;

         // Due to a timing issue with when page validation occurs, call the
         // Validate method to ensure that the values on the page are valid.
         Page.Validate();

         // Add the values in the text boxes if the page is valid.
         if(Page.IsValid)
         {
            Answer = Convert.ToInt32(Value1.Text) + Convert.ToInt32(Value2.Text);

            AnswerMessage.Text = Answer.ToString();
         }

      }

   </script>

</head>

<body>

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

      <h3> TextBox Example </h3>

      <table>

         <tr>

            <td colspan="5">

               Enter integer values into the text boxes. <br />
               The two values are automatically added <br />
               when you tab out of the text boxes. <br />

            </td>

         </tr>

         <tr>

            <td colspan="5">

                

            </td>

         </tr>

         <tr align="center">

            <td>

               <asp:TextBox ID="Value1"
                    Columns="2"
                    MaxLength="3"
                    AutoPostBack="True"
                    Text="1"
                    runat="server"/>

            </td>

            <td>

               + 

            </td>

            <td>

               <asp:TextBox ID="Value2"
                    Columns="2"
                    MaxLength="3"
                    AutoPostBack="True"
                    Text="1"
                    runat="server"/>

            </td>

            <td>

               =

            </td>

            <td>
               
               <asp:Label ID="AnswerMessage"
                    runat="server"/>

            </td>

         </tr>

         <tr>

            <td colspan="2">

               <asp:RequiredFieldValidator
                    ID="Value1RequiredValidator"
                    ControlToValidate="Value1"
                    ErrorMessage="Please enter a value.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value1RangeValidator"
                    ControlToValidate="Value1"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

            </td>

            <td colspan="2">

               <asp:RequiredFieldValidator
                    ID="Value2RequiredValidator"
                    ControlToValidate="Value2"
                    ErrorMessage="Please enter a value.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value2RangeValidator"
                    ControlToValidate="Value2"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

            </td>

            <td>

               &nbsp
 
            </td>

         </tr>

      </table>

   </form>

</body>
</html>
<%@ Page Language="VB" 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> TextBox Example </title>
<script runat="server">

      Protected Sub Page_Load(sender As Object, e As EventArgs)
    
         Dim Answer As Integer

         ' Due to a timing issue with when page validation occurs, call the
         ' Validate method to ensure that the values on the page are valid.
         Page.Validate()

         ' Add the values in the text boxes if the page is valid.
         If Page.IsValid Then
 
            Answer = Convert.ToInt32(Value1.Text) + Convert.ToInt32(Value2.Text)

            AnswerMessage.Text = Answer.ToString()

         End If

      End Sub

   </script>

</head>

<body>

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

      <h3> TextBox Example </h3>

      <table>

         <tr>

            <td colspan="5">

               Enter integer values into the text boxes. <br />
               The two values are automatically added <br />
               when you tab out of the text boxes. <br />

            </td>

         </tr>

         <tr>

            <td colspan="5">

                

            </td>

         </tr>

         <tr align="center">

            <td>

               <asp:TextBox ID="Value1"
                    Columns="2"
                    MaxLength="3"
                    AutoPostBack="True"
                    Text="1"
                    runat="server"/>

            </td>

            <td>

               + 

            </td>

            <td>

               <asp:TextBox ID="Value2"
                    Columns="2"
                    MaxLength="3"
                    AutoPostBack="True"
                    Text="1"
                    runat="server"/>

            </td>

            <td>

               =

            </td>

            <td>
               
               <asp:Label ID="AnswerMessage"
                    runat="server"/>

            </td>

         </tr>

         <tr>

            <td colspan="2">

               <asp:RequiredFieldValidator
                    ID="Value1RequiredValidator"
                    ControlToValidate="Value1"
                    ErrorMessage="Please enter a value.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value1RangeValidator"
                    ControlToValidate="Value1"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

            </td>

            <td colspan="2">

               <asp:RequiredFieldValidator
                    ID="Value2RequiredValidator"
                    ControlToValidate="Value2"
                    ErrorMessage="Please enter a value.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value2RangeValidator"
                    ControlToValidate="Value2"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br /> between than 1 and 100.<br />"
                    EnableClientScript="False"
                    Display="Dynamic"
                    runat="server"/>

            </td>

            <td>

               &nbsp
 
            </td>

         </tr>

      </table>

   </form>

</body>
</html>

備註

AutoPostBack使用 屬性可指定控件失去焦點時TextBox,是否將自動回傳至伺服器。 在控件中 TextBox 按下 ENTER 或 TAB 鍵是變更焦點最常見的方式。

注意

TextBox例如,如果控件的父容器包含標示為預設按鈕的按鈕 (,例如,如果容器的 DefaultButtonDefaultButton 屬性設定為) ,則不會引發預設按鈕Click的事件來回應自動回傳。

這個屬性無法由佈景主題或樣式表主題設定。 如需詳細資訊,請參閱 ThemeableAttributeASP.NET 主題和外觀

適用於

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