Page.IsClientScriptBlockRegistered(String) 方法

  • 參考

定義

命名空間:
System.Web.UI
組件:
System.Web.dll

警告

The recommended alternative is ClientScript.IsClientScriptBlockRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202

判斷具有指定索引鍵的用戶端指令碼區塊是否已向頁面註冊。

public:
 bool IsClientScriptBlockRegistered(System::String ^ key);
public bool IsClientScriptBlockRegistered (string key);
[System.Obsolete("The recommended alternative is ClientScript.IsClientScriptBlockRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")]
public bool IsClientScriptBlockRegistered (string key);
member this.IsClientScriptBlockRegistered : string -> bool
[<System.Obsolete("The recommended alternative is ClientScript.IsClientScriptBlockRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")>]
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字串索引鍵。

傳回

Boolean

如果指令碼區塊已註冊，則為 true，否則為 false。

屬性
ObsoleteAttribute

範例

下列程式碼範例示範如何搭配 IsClientScriptBlockRegistered 方法使用 RegisterClientScriptBlock 方法。 如果以程式碼宣告區塊撰寫的 ECMAScript 尚未註冊，如 所決定 IsClientScriptBlockRegistered ，則會 RegisterClientScriptBlock 進行呼叫。

<%@ 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)
  {
    String csname1 = "PopupScript";
    String csname2 = "ButtonClickScript";

    if (!IsClientScriptBlockRegistered(csname1))
    {
        String cstext1 = "<script type=\"text/javascript\">" +
            "alert('Hello World');</" + "script>";
        RegisterStartupScript(csname1, cstext1);
    }

    if (!IsClientScriptBlockRegistered(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>");
      RegisterClientScriptBlock(csname2, cstext2.ToString());
    }
  }
</script>
<html  >
  <head>
    <title>RegisterClientScriptBlock 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 EventArgs)
        Dim csname1 As String = "PopupScript"

        Dim csname2 As String = "ButtonClickScript"
    
        If Not IsClientScriptBlockRegistered(csname1) Then
            Dim cstext1 As String = "<script type=""text/javascript"">" & _
                "alert('Hello World');</" & "script>"
            RegisterStartupScript(csname1, cstext1)
        End If
    
        If Not IsClientScriptBlockRegistered(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>")
            RegisterClientScriptBlock(csname2, cstext2.ToString())
        End If
    End Sub
</script>
<html  >
  <head>
    <title>RegisterClientScriptBlock 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

呼叫 之前先呼叫 Page.RegisterClientScriptBlock 這個方法，以避免不必要的組合用戶端腳本。 如果腳本需要大量伺服器資源才能建立，這特別重要。

IsClientScriptBlockRegistered 方法已被取代。 IsClientScriptBlockRegistered使用 類別中的 ClientScriptManager 方法。

適用於

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