ClientScriptManager.RegisterHiddenField(String, String) Methode

  • Referenz

Definition

Namespace:
System.Web.UI
Assembly:
System.Web.dll

Registriert einen ausgeblendeten Wert für das Page-Objekt.

public:
 void RegisterHiddenField(System::String ^ hiddenFieldName, System::String ^ hiddenFieldInitialValue);
public void RegisterHiddenField (string hiddenFieldName, string hiddenFieldInitialValue);
member this.RegisterHiddenField : string * string -> unit
Public Sub RegisterHiddenField (hiddenFieldName As String, hiddenFieldInitialValue As String)

Parameter

hiddenFieldName
String

Der Name des zu registrierenden ausgeblendeten Felds.

hiddenFieldInitialValue
String

Der Anfangswert des zu registrierenden Felds.

Ausnahmen

ArgumentNullException

hiddenFieldName ist null.

Beispiele

Im folgenden Codebeispiel wird die Verwendung der RegisterArrayDeclaration Methoden und RegisterHiddenField veranschaulicht. Im Beispiel werden ein Array und ein ausgeblendeter Wert registriert und das OnClick Ereignis einer <input> Schaltfläche definiert, um die Summe der zwei Werte des Arrays und des ausgeblendeten Werts zu berechnen.

<%@ 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 array name and values.
    String arrName = "MyArray";
    String arrValue = "\"1\", \"2\", \"text\"";
    
    // Define the hidden field name and initial value.
    String hiddenName = "MyHiddenField";
    String hiddenValue = "3";
    
    // Define script name and type.
    String csname = "ConcatScript";
    Type cstype = this.GetType();
        
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Register the array with the Page class.
    cs.RegisterArrayDeclaration(arrName, arrValue);

    // Register the hidden field with the Page class.
    cs.RegisterHiddenField(hiddenName, hiddenValue);

    // Check to see if the  script is already registered.
    if (!cs.IsClientScriptBlockRegistered(cstype, csname))
    {
      StringBuilder cstext = new StringBuilder();
      cstext.Append("<script type=\"text/javascript\"> function DoClick() {"); 
      cstext.Append("Form1.Message.value='Sum = ' + ");
      cstext.Append("(parseInt(" + arrName + "[0])+");
      cstext.Append("parseInt(" + arrName + "[1])+");
      cstext.Append("parseInt(" + Form1.Name + "." + hiddenName + ".value));} </");
      cstext.Append("script>");
      cs.RegisterClientScriptBlock(cstype, csname, cstext.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" 
            onclick="DoClick()" 
            value="Run Script" />
     </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 array name and values.
    Dim arrName As String = "MyArray"
    Dim arrValue As String = """1"", ""2"", ""text"""
    
    ' Define the hidden field name and initial value.
    Dim hiddenName As String = "MyHiddenField"
    Dim hiddenValue As String = "3"
    
    ' Define script name and type.
    Dim csname As String = "ConcatScript"
    Dim cstype As Type = Me.GetType()
        
    ' Get a ClientScriptManager reference from the Page class.
    Dim cs As ClientScriptManager = Page.ClientScript

    ' Register the array with the Page class.
    cs.RegisterArrayDeclaration(arrName, arrValue)
    
    ' Register the hidden field with the Page class.
    cs.RegisterHiddenField(hiddenName, hiddenValue)

    ' Check to see if the  script is already registered.
    If (Not cs.IsClientScriptBlockRegistered(cstype, csname)) Then
      Dim cstext As StringBuilder = New StringBuilder()
      cstext.Append("<script type=""text/javascript\""> function DoClick() {")
      cstext.Append("Form1.Message.value='Sum = ' + ")
      cstext.Append("(parseInt(" + arrName + "[0])+")
      cstext.Append("parseInt(" + arrName + "[1])+")
      cstext.Append("parseInt(" + Form1.Name + "." + hiddenName + ".value));} </")
      cstext.Append("script>")
      cs.RegisterClientScriptBlock(cstype, csname, cstext.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" 
            onclick="DoClick()" 
            value="Run Script" />
     </form>
  </body>
</html>

Hinweise

Die RegisterHiddenField -Methode erstellt ein ausgeblendetes <input> Element auf der gerenderten HTML-Seite.

Gilt für:

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