Page.IsStartupScriptRegistered(String) Metodo

Definizione

Attenzione

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

Determina se lo script di avvio del client è stato registrato con l'oggetto Page.Determines whether the client startup script is registered with the Page object.

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

Parametri

key
String

Chiave stringa dello script di avvio da ricercare.The string key of the startup script to search for.

Restituisce

Boolean

true se lo script di avvio è stato registrato, altrimenti false.true if the startup script is registered; otherwise, false.

Attributi

Esempio

Nell'esempio di codice riportato di seguito viene illustrato l'utilizzo del RegisterStartupScript metodo in combinazione con il IsStartupScriptRegistered metodo.The following code example demonstrates the use of the RegisterStartupScript method in conjunction with the IsStartupScriptRegistered method. Se l'ECMAScript scritto nel blocco di dichiarazione del codice non è già stato registrato, come determinato da IsStartupScriptRegistered , RegisterStartupScript viene eseguita una chiamata.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>

Commenti

Chiamare questo metodo prima Page.RegisterStartupScript di chiamare per evitare di assemblare inutilmente lo script sul lato client.Call this method before calling Page.RegisterStartupScript to avoid unnecessarily assembling the client-side script. Questa operazione è particolarmente importante se lo script richiede una grande quantità di risorse server da creare.This is particularly important if the script requires a large amount of server resources to create.

Il metodo IsStartupScriptRegistered è stato deprecato.The IsStartupScriptRegistered method has been deprecated. Usare il IsStartupScriptRegistered metodo nella ClientScriptManager classe.Use the IsStartupScriptRegistered method in the ClientScriptManager class.

Si applica a

Vedi anche