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ClientScriptManager.IsClientScriptBlockRegistered 方法

定義

判斷用戶端指令碼區塊是否向 Page 物件註冊過。

多載

IsClientScriptBlockRegistered(String)

判斷用戶端指令碼區塊是否已使用指定的索引鍵,向 Page 物件註冊。

IsClientScriptBlockRegistered(Type, String)

判斷用戶端指令碼區塊是否已使用指定的索引鍵和型別,向 Page 物件註冊。

IsClientScriptBlockRegistered(String)

判斷用戶端指令碼區塊是否已使用指定的索引鍵,向 Page 物件註冊。

public:
 bool IsClientScriptBlockRegistered(System::String ^ key);
public bool IsClientScriptBlockRegistered (string key);
member this.IsClientScriptBlockRegistered : string -> bool
Public Function IsClientScriptBlockRegistered (key As String) As Boolean

參數

key
String

要搜尋的用戶端指令碼區塊索引鍵。

傳回

如果此用戶端指令碼區塊已註冊,則為 true,否則為 false

範例

<%@ 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">
  public void Page_Load(Object sender, EventArgs e)
  {
    // Define the name and type of the client scripts on the page.
    String csname1 = "PopupScript";
    String csname2 = "ButtonClickScript";
    Type cstype = this.GetType();
        
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Check to see if the startup script is already registered.
    if (!cs.IsStartupScriptRegistered(cstype, csname1))
    {
      String cstext1 = "alert('Hello World');";
      cs.RegisterStartupScript(cstype, csname1, cstext1);
    }

    // Check to see if the client script is already registered.
    if (!cs.IsClientScriptBlockRegistered(cstype, csname2))
    {
      StringBuilder cstext2 = new StringBuilder();
      cstext2.Append("<script type=\"text/javascript\"> function DoClick() {");
      cstext2.Append("Form1.Message.value='Text from client script.'} </");
      cstext2.Append("script>");
      cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString());
    }
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ClientScriptManager Example</title>
  </head>
  <body>
     <form id="Form1"
         runat="server">
        <input type="text" id="Message" /> <input type="button" value="ClickMe" onclick="DoClick()" />
     </form>
  </body>
</html>
<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Define the name and type of the client scripts on the page.
    Dim csname1 As String = "PopupScript"
    Dim csname2 As String = "ButtonClickScript"
    Dim cstype As Type = Me.GetType()
    
    ' Get a ClientScriptManager reference from the Page class.
    Dim cs As ClientScriptManager = Page.ClientScript

    ' Check to see if the startup script is already registered.
    If (Not cs.IsStartupScriptRegistered(cstype, csname1)) Then
      
      Dim cstext1 As String = "alert('Hello World');"
            cs.RegisterStartupScript(cstype, csname1, cstext1)
      
    End If
    
    ' Check to see if the client script is already registered.
    If (Not cs.IsClientScriptBlockRegistered(cstype, csname2)) Then
      
      Dim cstext2 As New StringBuilder()
            cstext2.Append("<script type=""text/javascript""> function DoClick() {")
      cstext2.Append("Form1.Message.value='Text from client script.'} </")
      cstext2.Append("script>")
            cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString())
      
    End If
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ClientScriptManager Example</title>
  </head>
  <body>
     <form id="Form1"
         runat="server">
        <input type="text" id="Message" /> <input type="button" value="ClickMe" onclick="DoClick()" />
     </form>
  </body>
</html>

備註

在呼叫 方法之前先呼叫 RegisterClientScriptBlock 這個方法,以避免註冊重複的腳本。 如果腳本需要大量伺服器資源才能建立,這特別重要。

用戶端腳本是由其索引鍵和其類型唯一識別。 具有相同索引鍵和類型的腳本會被視為重複專案。

此方法的 IsClientScriptBlockRegistered 這個多載會呼叫多載,該多載會使用 keytype 參數,並將型別設定為 Page 物件

另請參閱

適用於

IsClientScriptBlockRegistered(Type, String)

判斷用戶端指令碼區塊是否已使用指定的索引鍵和型別,向 Page 物件註冊。

public:
 bool IsClientScriptBlockRegistered(Type ^ type, System::String ^ key);
public bool IsClientScriptBlockRegistered (Type type, string key);
member this.IsClientScriptBlockRegistered : Type * string -> bool
Public Function IsClientScriptBlockRegistered (type As Type, key As String) As Boolean

參數

type
Type

要搜尋的用戶端指令碼區塊型別。

key
String

要搜尋的用戶端指令碼區塊索引鍵。

傳回

如果此用戶端指令碼區塊已註冊,則為 true,否則為 false

例外狀況

用戶端指令碼型別為 null

範例

下列程式碼範例示範 如何使用 IsClientScriptBlockRegistered 方法。 請注意,如果已移除檢查現有用戶端腳本區塊的邏輯,則轉譯頁面的 HTML 原始程式碼中不會有兩個重複的用戶端腳本,因為 RegisterClientScriptBlock 方法會檢查重複專案。 檢查的優點是減少不必要的計算。

<%@ 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">
  public void Page_Load(Object sender, EventArgs e)
  {
    // Define the name and type of the client scripts on the page.
    String csname1 = "PopupScript";
    String csname2 = "ButtonClickScript";
    Type cstype = this.GetType();
        
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Check to see if the startup script is already registered.
    if (!cs.IsStartupScriptRegistered(cstype, csname1))
    {
      String cstext1 = "alert('Hello World');";
      cs.RegisterStartupScript(cstype, csname1, cstext1, true);
    }

    // Check to see if the client script is already registered.
    if (!cs.IsClientScriptBlockRegistered(cstype, csname2))
    {
      StringBuilder cstext2 = new StringBuilder();
      cstext2.Append("<script type=\"text/javascript\"> function DoClick() {");
      cstext2.Append("Form1.Message.value='Text from client script.'} </");
      cstext2.Append("script>");
      cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString(), false);
    }
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ClientScriptManager Example</title>
  </head>
  <body>
     <form id="Form1"
         runat="server">
        <input type="text" id="Message" /> <input type="button" value="ClickMe" onclick="DoClick()" />
     </form>
  </body>
</html>
<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Define the name and type of the client scripts on the page.
    Dim csname1 As String = "PopupScript"
    Dim csname2 As String = "ButtonClickScript"
    Dim cstype As Type = Me.GetType()
    
    ' Get a ClientScriptManager reference from the Page class.
    Dim cs As ClientScriptManager = Page.ClientScript

    ' Check to see if the startup script is already registered.
    If (Not cs.IsStartupScriptRegistered(cstype, csname1)) Then
      
      Dim cstext1 As String = "alert('Hello World');"
      cs.RegisterStartupScript(cstype, csname1, cstext1, True)
      
    End If
    
    ' Check to see if the client script is already registered.
    If (Not cs.IsClientScriptBlockRegistered(cstype, csname2)) Then
      
      Dim cstext2 As New StringBuilder()
            cstext2.Append("<script type=""text/javascript""> function DoClick() {")
      cstext2.Append("Form1.Message.value='Text from client script.'} </")
      cstext2.Append("script>")
      cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString(), False)
      
    End If
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ClientScriptManager Example</title>
  </head>
  <body>
     <form id="Form1"
         runat="server">
        <input type="text" id="Message" /> <input type="button" value="ClickMe" onclick="DoClick()" />
     </form>
  </body>
</html>

備註

在呼叫 方法之前先呼叫 RegisterClientScriptBlock 這個方法,以避免註冊重複的腳本。 如果腳本需要大量伺服器資源才能建立,這特別重要。

用戶端腳本是由其索引鍵和其類型唯一識別。 具有相同索引鍵和類型的腳本會被視為重複專案。 您可以根據將存取資源的物件來指定型別。 例如,使用 Page 實例來存取資源時,您可以指定 Page 類型。

另請參閱

適用於