Page.IsStartupScriptRegistered(String) Page.IsStartupScriptRegistered(String) Page.IsStartupScriptRegistered(String) Page.IsStartupScriptRegistered(String) Method

定義

警告

此 API 現已淘汰。

判斷用戶端啟始指令碼是否已使用 Page 物件註冊。Determines whether the client startup script is registered with the Page object.

public:
 bool IsStartupScriptRegistered(System::String ^ key);
[System.Obsolete("The recommended alternative is ClientScript.IsStartupScriptRegistered(string key). http://go.microsoft.com/fwlink/?linkid=14202")]
public bool IsStartupScriptRegistered (string key);
member this.IsStartupScriptRegistered : string -> bool
Public Function IsStartupScriptRegistered (key As String) As Boolean

參數

key
String String String String

要搜尋的啟始指令碼字串索引鍵。The string key of the startup script to search for.

傳回

如果啟始指令碼已登錄,則為 true,否則為 falsetrue if the startup script is registered; otherwise, false.

範例

下列程式碼範例示範如何搭配使用RegisterStartupScript方法IsStartupScriptRegistered與方法。The following code example demonstrates the use of the RegisterStartupScript method in conjunction with the IsStartupScriptRegistered method. 如果程式碼宣告區塊中所撰寫的 ECMAScript 尚未由IsStartupScriptRegistered決定, RegisterStartupScript則會進行呼叫。If the ECMAScript written in the code declaration block has not already been registered, as determined by IsStartupScriptRegistered, then a RegisterStartupScript call is made.

<%@ 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

在呼叫Page.RegisterStartupScript之前呼叫這個方法,以避免不必要地組合用戶端腳本。Call this method before calling Page.RegisterStartupScript to avoid unnecessarily assembling the client-side script. 如果腳本需要大量的伺服器資源來建立,這一點特別重要。This is particularly important if the script requires a large amount of server resources to create.

IsStartupScriptRegistered 方法已被取代。The IsStartupScriptRegistered method has been deprecated. 在類別中使用IsStartupScriptRegistered方法 ClientScriptManagerUse the IsStartupScriptRegistered method in the ClientScriptManager class.

適用於

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