HtmlInputRadioButton.OnServerChange(EventArgs) Metode
Definisi
Penting
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Memunculkan kejadian ServerChange. Ini memungkinkan Anda membuat penanganan aktivitas kustom saat acara dinaikkan.
protected:
virtual void OnServerChange(EventArgs ^ e);protected virtual void OnServerChange (EventArgs e);abstract member OnServerChange : EventArgs -> unit
override this.OnServerChange : EventArgs -> unitProtected Overridable Sub OnServerChange (e As EventArgs)Parameter
Contoh
Contoh kode berikut menunjukkan cara menentukan dan mengodekan handler untuk peristiwa tersebut ServerChange . Penanganan aktivitas kustom memperbarui label pada halaman Web untuk menampilkan nilai tombol radio yang dipilih.
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputRadioButton Sample</title>
<script runat="server">
void Server_Change(object sender, EventArgs e)
{
if (Radio1.Checked)
Span1.InnerHtml = "You selected " +
Radio1.Value;
else if (Radio2.Checked)
Span1.InnerHtml = "You selected " +
Radio2.Value;
else if (Radio3.Checked)
Span1.InnerHtml = "You selected " +
Radio3.Value;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputRadioButton Sample</h3>
<input type="radio"
id="Radio1"
name="Mode"
value="Radio Button 1"
onserverchange="Server_Change"
runat="server"/>
Option 1
<br />
<input type="radio"
id="Radio2"
name="Mode"
value="Radio Button 2"
onserverchange="Server_Change"
runat="server"/>
Option 2
<br />
<input type="radio"
id="Radio3"
name="Mode"
value="Radio Button 3"
onserverchange="Server_Change"
runat="server"/>
Option 3
<br />
<input type="submit"
id="Button1"
value="Submit"
runat="server"/>
<br />
<span id="Span1"
runat="server" />
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputRadioButton Sample</title>
<script runat="server">
Sub Server_Change(sender As Object , e As EventArgs)
If Radio1.Checked Then
Span1.InnerHtml = "You selected " & _
Radio1.Value
ElseIf Radio2.Checked Then
Span1.InnerHtml = "You selected " & _
Radio2.Value
ElseIf Radio3.Checked Then
Span1.InnerHtml = "You selected " & _
Radio3.Value
End If
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputRadioButton Sample</h3>
<input type="radio"
id="Radio1"
name="Mode"
value="Radio Button 1"
onserverchange="Server_Change"
runat="server"/>
Option 1
<br />
<input type="radio"
id="Radio2"
name="Mode"
value="Radio Button 2"
onserverchange="Server_Change"
runat="server"/>
Option 2
<br />
<input type="radio"
id="Radio3"
name="Mode"
value="Radio Button 3"
onserverchange="Server_Change"
runat="server"/>
Option 3
<br />
<input type="submit"
id="Button1"
value="Submit"
runat="server"/>
<br />
<span id="Span1"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputRadioButton ServerChange Example</title>
<script runat="server">
void Server_Change(object sender, EventArgs e)
{
if (Radio1.Checked)
{
Span1.InnerHtml = "You selected " + Radio1.Value;
}
else if (Radio2.Checked)
{
Span1.InnerHtml = "You selected " + Radio2.Value;
}
else if (Radio3.Checked)
{
Span1.InnerHtml = "You selected " + Radio3.Value;
}
}
void Page_Load(object sender, EventArgs e)
{
// Create an EventHandler delegate for the method you want to
// handle the event, and then add it to the list of methods
// called when the event is raised.
Radio1.ServerChange += new System.EventHandler(this.Server_Change);
Radio2.ServerChange += new System.EventHandler(this.Server_Change);
Radio3.ServerChange += new System.EventHandler(this.Server_Change);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputRadioButton ServerChange Example</h3>
<input type="radio"
id="Radio1"
name="Mode"
value="Radio Button 1"
runat="server"/>
Option 1
<br />
<input type="radio"
id="Radio2"
name="Mode"
value="Radio Button 2"
runat="server"/>
Option 2
<br />
<input type="radio"
id="Radio3"
name="Mode"
value="Radio Button 3"
runat="server"/>
Option 3
<br />
<input type="submit"
id="Button1"
value="Submit"
runat="server"/>
<br />
<span id="Span1"
runat="server" />
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>HtmlInputRadioButton ServerChange Example</title>
<script runat="server">
Sub Server_Change(sender As Object, e As EventArgs)
If Radio1.Checked Then
Span1.InnerHtml = "You selected " & Radio1.Value
ElseIf Radio2.Checked Then
Span1.InnerHtml = "You selected " & Radio2.Value
ElseIf Radio3.Checked Then
Span1.InnerHtml = "You selected " & Radio3.Value
End If
End Sub
Sub Page_Load(sender As Object, e As EventArgs)
' Create an EventHandler delegate for the method you want to
' handle the event, and then add it to the list of methods
' called when the event is raised.
AddHandler Radio1.ServerChange, AddressOf Server_Change
AddHandler Radio2.ServerChange, AddressOf Server_Change
AddHandler Radio3.ServerChange, AddressOf Server_Change
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputRadioButton ServerChange Example</h3>
<input type="radio"
id="Radio1"
name="Mode"
value="Radio Button 1"
runat="server"/>
Option 1
<br />
<input type="radio"
id="Radio2"
name="Mode"
value="Radio Button 2"
runat="server"/>
Option 2
<br />
<input type="radio"
id="Radio3"
name="Mode"
value="Radio Button 3"
runat="server"/>
Option 3
<br />
<input type="submit"
id="Button1"
value="Submit"
runat="server"/>
<br />
<span id="Span1"
runat="server" />
</form>
</body>
</html>
Keterangan
Peristiwa ServerChange dimunculkan ketika Checked properti HtmlInputRadioButton kontrol mengubah nilai antara postingan ke server. Ini memungkinkan Anda membuat penanganan aktivitas kustom yang melakukan serangkaian instruksi tertentu (seperti validasi data) saat peristiwa dinaikkan.
Catatan
Kontrol harus mengaktifkan status tampilan agar ServerChange kejadian berfungsi dengan benar. Untuk mengaktifkan status tampilan untuk semua kontrol pada halaman Formulir Web, atur properti ke Page.EnableViewStatetrue. Anda juga dapat mengaktifkan status tampilan untuk kontrol individual dengan mengatur properti ke Control.EnableViewStatetrue.
Menaikkan peristiwa memanggil penanganan aktivitas melalui delegasi. Untuk informasi selengkapnya, lihat Menangani dan Meningkatkan Peristiwa.
Metode ini OnServerChange juga memungkinkan kelas turunan untuk menangani peristiwa tanpa melampirkan delegasi. Ini adalah teknik yang disukai untuk menangani peristiwa di kelas turunan.
Catatan Bagi Inheritor
Saat mengambil alih di kelas turunan OnServerChange(EventArgs) , pastikan untuk memanggil metode kelas OnServerChange(EventArgs) dasar sehingga delegasi terdaftar menerima peristiwa tersebut.
