ClientScriptManager.IsClientScriptBlockRegistered 方法

定義

命名空間:: System.Web.UI

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

判斷用戶端腳本區塊是否已註冊於該 Page 物件。

多載

名稱	Description
IsClientScriptBlockRegistered(String)	判斷用戶端腳本區塊是否已以指定金鑰註冊於物件 Page 。
IsClientScriptBlockRegistered(Type, String)	判斷用戶端腳本區塊是否以金鑰與類型與物件註冊 Page 。

IsClientScriptBlockRegistered(String)

判斷用戶端腳本區塊是否已以指定金鑰註冊於物件 Page 。

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

要搜尋的客戶腳本區塊的金鑰。

傳回

Boolean

true如果用戶端腳本區塊被註冊;否則，。 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 RegisterClientScriptBlock 該方法之前，先呼叫此方法，以避免註冊重複腳本。如果腳本需要大量伺服器資源來建立，這點尤其重要。

用戶端腳本以其鍵與類型唯一識別。具有相同鍵與型別的腳本被視為重複。

此方法的超載 IsClientScriptBlockRegistered 會呼叫一個同時取 a key 與 type 參數的超載，且該 Page 參數設為物件型別

另請參閱

適用於

IsClientScriptBlockRegistered(Type, String)

判斷用戶端腳本區塊是否以金鑰與類型與物件註冊 Page 。

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

要搜尋的客戶端腳本區塊類型。

key: String

要搜尋的客戶腳本區塊的金鑰。

傳回

Boolean

true如果用戶端腳本區塊被註冊;否則，。 false

例外狀況

ArgumentNullException

用戶端腳本類型為 null。

範例

以下程式碼範例示範了此 IsClientScriptBlockRegistered 方法的使用。請注意，如果移除檢查現有客戶端腳本區塊的邏輯，渲染頁面的 HTML 原始碼中就不會有兩個重複的客戶端腳本，因為該 RegisterClientScriptBlock 方法會檢查重複。檢查的好處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 RegisterClientScriptBlock 該方法之前，先呼叫此方法，以避免註冊重複腳本。如果腳本需要大量伺服器資源來建立，這點尤其重要。

用戶端腳本以其鍵與類型唯一識別。具有相同鍵與型別的腳本被視為重複。你可以根據將要存取資源的物件來指定類型。例如，當使用 Page 實例存取資源時，你指定 Page 了類型。

另請參閱

適用於

意見反應

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