HtmlButton.CausesValidation 屬性

定義

取得或設定值,指出按一下 HtmlButton 控制項時,是否執行驗證。Gets or sets a value indicating whether validation is performed when the HtmlButton control is clicked.

public:
 property bool CausesValidation { bool get(); void set(bool value); };
public:
 virtual property bool CausesValidation { bool get(); void set(bool value); };
public bool CausesValidation { get; set; }
public virtual bool CausesValidation { get; set; }
member this.CausesValidation : bool with get, set
Public Property CausesValidation As Boolean
Public Overridable Property CausesValidation As Boolean

屬性值

Boolean

如果按一下 HtmlButton 控制項時會執行驗證,則為 true;否則為 falsetrue if validation is performed when the HtmlButton control is clicked; otherwise, false. 預設值是 trueThe default value is true.

範例

下列程式碼範例示範如何使用 CausesValidation 屬性來防止頁面驗證發生。The following code example demonstrates how to use the CausesValidation property to prevent page validation from occurring. 請注意,此 Validate 方法會個別啟用每個驗證控制項。Note that the Validate method activates each validation control independently.


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

      void SubmitButton_Click(Object sender, EventArgs e)
      {
         
         // Determine which button was clicked.
         switch(((HtmlButton)sender).ID)
         {

            case "CityQueryButton":

               // Validate only the controls used for the city query.
               CityReqValidator.Validate();

               // Take the appropriate action if the controls pass validation. 
               if (CityReqValidator.IsValid)
               {
                  Message.InnerHtml = "You have chosen to run a query for the following city: " + 
                     CityTextBox.Value;
               }

               break;

            case "StateQueryButton":

               // Validate only the controls used for the state query.
               StateReqValidator.Validate();

               // Take the appropriate action if the controls pass validation.
               if (StateReqValidator.IsValid)
               {
                  Message.InnerHtml = "You have chosen to run a query for the following state: " + 
                     StateTextBox.Value;
               }

               break;

            default:

               // If the button clicked is not recognized, erase the message on the page.
               Message.InnerHtml = "";

               break;

         }
        
      }

   </script>

</head>

<body>

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

      <h3> HtmlButton CausesValidation Example </h3>

      <table border="1" cellpadding="10">
         <tr>
            <td>
               <b>Enter city to query.</b> <br />
               <input id="CityTextBox" 
                      type="Text"
                      runat="server"/>
               <asp:RequiredFieldValidator ID="CityReqValidator"
                    ControlToValidate="CityTextBox"
                    ErrorMessage="<br />Please enter a city."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="CityQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

         <tr>
            <td>
               <b>Enter state to query.</b> <br />
               <input id="StateTextBox" 
                      type="Text" 
                      runat="server"/>
               <asp:RequiredFieldValidator ID="StateReqValidator"
                    ControlToValidate="StateTextBox"
                    ErrorMessage="<br />Please enter a state."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="StateQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

      </table>

      <br /><br />

      <span id="Message"
            runat="Server"/>


   </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> HtmlButton CausesValidation Example </title>
<script runat="server">

      Sub SubmitButton_Click(sender As Object, e As EventArgs)
         
         ' Determine which button was clicked.
         Select Case (CType(sender, HtmlButton)).ID

            Case "CityQueryButton"

               ' Validate only the controls used for the city query.
               CityReqValidator.Validate()

               ' Take the appropriate action if the controls pass validation. 
               If CityReqValidator.IsValid Then
           
                  Message.InnerHtml = "You have chosen to run a query for the following city: " & _ 
                     CityTextBox.Value
               
               End If

            Case "StateQueryButton"

               ' Validate only the controls used for the state query.
               StateReqValidator.Validate()

               ' Take the appropriate action if the controls pass validation.
               If StateReqValidator.IsValid Then
               
                  Message.InnerHtml = "You have chosen to run a query for the following state: " & _ 
                     StateTextBox.Value
               
               End If

            Case Else

               ' If the button clicked is not recognized, erase the message on the page.
               Message.InnerHtml = ""

         End Select
        
      End Sub

   </script>

</head>

<body>

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

      <h3> HtmlButton CausesValidation Example </h3>

      <table border="1" cellpadding="10">
         <tr>
            <td>
               <b>Enter city to query.</b> <br />
               <input id="CityTextBox" 
                      type="Text"
                      runat="server"/>
               <asp:RequiredFieldValidator ID="CityReqValidator"
                    ControlToValidate="CityTextBox"
                    ErrorMessage="<br />Please enter a city."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="CityQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

         <tr>
            <td>
               <b>Enter state to query.</b> <br />
               <input id="StateTextBox" 
                      type="Text" 
                      runat="server"/>
               <asp:RequiredFieldValidator ID="StateReqValidator"
                    ControlToValidate="StateTextBox"
                    ErrorMessage="<br />Please enter a state."
                    Display="Dynamic"
                    EnableClientScript="False"
                    runat="server"/>
            </td>
            <td valign="bottom">
               <button id="StateQueryButton"
                       causesvalidation="False"
                       onserverclick="SubmitButton_Click"
                       runat="server">
                  Submit
               </button>
            </td>
         </tr>

      </table>

      <br /><br />

      <span id="Message"
            runat="Server"/>


   </form>

</body>
</html>

備註

依預設,在按一下控制項時,會執行頁面驗證 HtmlButtonBy default, page validation is performed when an HtmlButton control is clicked. 頁面驗證會決定與頁面上的驗證控制項相關聯的輸入控制項,是否全都通過驗證控制項所指定的驗證規則。Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control.

您可以使用屬性來指定或判斷在按一下控制項時,是否在用戶端和伺服器上執行驗證 HtmlButton CausesValidationYou can specify or determine whether validation is performed on both the client and the server when an HtmlButton control is clicked by using the CausesValidation property. 若要避免執行驗證,請將 CausesValidation 屬性設定為 falseTo prevent validation from being performed, set the CausesValidation property to false.

這個屬性通常用於事件的事件處理常式中 ServerClick ,以防止在按一下 [取消] 或 [重設] 按鈕時進行頁面驗證。This property is commonly used in the event handler for the ServerClick event to prevent page validation from occurring when a Cancel or Reset button is clicked.

適用於

另請參閱