HtmlInputImage.OnServerClick(ImageClickEventArgs) Metode
Definisi
Penting
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Memunculkan kejadian ServerClick.
protected:
virtual void OnServerClick(System::Web::UI::ImageClickEventArgs ^ e);
protected virtual void OnServerClick (System.Web.UI.ImageClickEventArgs e);
abstract member OnServerClick : System.Web.UI.ImageClickEventArgs -> unit
override this.OnServerClick : System.Web.UI.ImageClickEventArgs -> unit
Protected Overridable Sub OnServerClick (e As ImageClickEventArgs)
Parameter
Yang ImageClickEventArgs berisi data peristiwa.
Contoh
Contoh kode berikut menunjukkan cara menentukan dan mengodekan handler untuk ServerClick peristiwa guna menentukan koordinat tempat pengguna mengklik HtmlInputImage kontrol.
<%@ 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">
<script runat="server">
protected void ImageBtn_Click(object sender, ImageClickEventArgs e)
{
// Write the click coordinates to the Span1 element.
Span1.InnerText = "You clicked at (" + e.X.ToString() +
", " + e.Y.ToString() + ").";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Click the Image </title>
</head>
<body>
<form id="form1" runat="server">
<h3>Click the Image </h3>
<input type="image"
alt="Image Alternate Text"
src="Image1.jpg"
onserverclick="ImageBtn_Click"
runat="server" id="Image1"/>
<br />
<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">
<script runat="server">
Sub ImageBtn_Click(ByVal Sender As Object, ByVal E As ImageClickEventArgs)
' Write the click coordinates to the Span1 element.
Span1.InnerText = "You clicked at (" & E.X.ToString() & _
", " & E.Y.ToString() & ")."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Click the Image </title>
</head>
<body>
<form id="form1" runat="server">
<h3>Click the Image </h3>
<input type="image"
alt="Image Alternate Text"
src="Image1.jpg"
onserverclick="ImageBtn_Click"
runat="server"/>
<br />
<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">
<script runat="server">
void ImageBtn_Click(Object sender, ImageClickEventArgs e)
{
// Display the coordinates of the position where the image
// was clicked.
Span1.InnerText = "You clicked at (" + e.X.ToString() +
", " + e.Y.ToString() + ").";
}
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.
Image1.ServerClick += new ImageClickEventHandler(this.ImageBtn_Click);
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HtmlInputImage ServerClick Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputImage ServerClick Example </h3>
<input type="image"
id="Image1"
src="Image.jpg"
alt="Image"
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">
<script runat="server">
Sub ImageBtn_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs)
' Display the coordinates of the position where the image
' was clicked.
Span1.InnerText = "You clicked at (" & e.X.ToString() & _
", " & e.Y.ToString() & ")."
End Sub
Sub Page_Load(ByVal sender As Object, ByVal 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 Image1.ServerClick, AddressOf ImageBtn_Click
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HtmlInputImage ServerClick Example </title>
</head>
<body>
<form id="form1" runat="server">
<h3>HtmlInputImage ServerClick Example </h3>
<input type="image"
id="Image1"
src="Image.jpg"
alt="Image"
runat="server"/>
<br />
<span id="Span1"
runat="server"/>
</form>
</body>
</html>
Keterangan
Peristiwa ServerClick dimunculkan saat pengguna mengklik HtmlInputImage kontrol.
Koordinat tempat pengguna mengklik HtmlInputImage kontrol dapat ditentukan dengan menggunakan ImageClickEventArgs.X properti System.Web.UI.ImageClickEventArgs dan ImageClickEventArgs.Y objek . Objek System.Web.UI.ImageClickEventArgs diteruskan sebagai parameter ke penanganan aktivitas yang ditentukan pengguna.
Catatan
Asal (0, 0) terletak di sudut kiri atas gambar.
Menaikkan peristiwa memanggil penanganan aktivitas melalui delegasi. Untuk informasi selengkapnya, lihat Menangani dan Meningkatkan Peristiwa.
Metode ini OnServerClick 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 OnServerClick(ImageClickEventArgs) , pastikan untuk memanggil metode kelas OnServerClick(ImageClickEventArgs) dasar sehingga delegasi terdaftar menerima peristiwa tersebut.