OnPreRender イベントを発生させ、ポストバックを生成するためのクライアント スクリプトを登録します。
名前空間: System.Web.UI.HtmlControls
アセンブリ: System.Web (system.web.dll 内)
構文
'宣言
Protected Friend Overrides Sub OnPreRender ( _
e As EventArgs _
)
'使用
Dim e As EventArgs
Me.OnPreRender(e)
protected internal override void OnPreRender (
EventArgs e
)
protected public:
virtual void OnPreRender (
EventArgs^ e
) override
protected void OnPreRender (
EventArgs e
)
protected internal override function OnPreRender (
e : EventArgs
)
適用できません。
パラメータ
- e
イベント データを格納している EventArgs。
解説
OnPreRender メソッドは Control.OnPreRender メソッドをオーバーライドします。OnPreRender は、主に、コントロール開発者が使用します。
使用例
OnPreRender メソッドをオーバーライドして、HtmlInputButton カスタム コントロールを常に太字で表示する方法を次のコード例に示します。
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ 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>Custom HtmlInputButton - OnPreRender - Visual Basic Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
HtmlInputButton1.Attributes.Add("onclick", "alert('Hello client-side world.');")
End Sub
Sub HtmlInputButton1_ServerClick(sender As Object, e As EventArgs)
Div1.InnerHtml = "Hello server-side world."
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputButton - OnPreRender - Visual Basic Example</h3>
<aspSample:CustomHtmlInputButtonOnPreRender
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Html Input Button"
name="HtmlInputButton1">
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ 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>Custom HtmlInputButton - OnPreRender - C# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlInputButton1.Attributes.Add("onclick","alert('Hello client-side world.');");
}
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
Div1.InnerHtml = "Hello server-side world.";
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputButton - OnPreRender - C# Example</h3>
<aspSample:CustomHtmlInputButtonOnPreRender
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Html Input Button"
name="HtmlInputButton1">
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" 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>Custom HtmlInputButton - OnPreRender - VJ# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlInputButton1.get_Attributes().Add("onclick",
"alert('Hello client-side world.');");
} //Page_Load
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
Div1.set_InnerHtml("Hello server-side world.");
} //HtmlInputButton1_ServerClick
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputButton - OnPreRender - VJ# Example</h3>
<aspSample:CustomHtmlInputButtonOnPreRender
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Html Input Button"
name="HtmlInputButton1">
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlInputButtonOnPreRender
Inherits System.Web.UI.HtmlControls.HtmlInputButton
Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
' Call the base class's OnPreRender method.
MyBase.OnPreRender(e)
' Always display the HtmlInputButton with bold text.
Me.Style.Add("font-weight", "bold")
End Sub
End Class
End Namespace
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlInputButtonOnPreRender : System.Web.UI.HtmlControls.HtmlInputButton
{
protected override void OnPreRender(System.EventArgs e)
{
// Call the base class's OnPreRender method.
base.OnPreRender(e);
// Always display the HtmlInputButton with bold text.
this.Style.Add("font-weight", "bold");
}
}
}
package Samples.AspNet.JSL.Controls;
public class CustomHtmlInputButtonOnPreRender
extends System.Web.UI.HtmlControls.HtmlInputButton
{
protected void OnPreRender(System.EventArgs e)
{
// Call the base OnPreRender method.
super.OnPreRender(e);
// Always display the HtmlButton with bold text.
this.get_Style().Add("font-weight", "bold");
} //OnPreRender
} //CustomHtmlInputButtonOnPreRender
プラットフォーム
Windows 98,Windows Server 2000 SP4,Windows CE,Windows Millennium Edition,Windows Mobile for Pocket PC,Windows Mobile for Smartphone,Windows Server 2003,Windows XP Media Center Edition,Windows XP Professional x64 Edition,Windows XP SP2,Windows XP Starter Edition
Microsoft .NET Framework 3.0 は Windows Vista,Microsoft Windows XP SP2,および Windows Server 2003 SP1 でサポートされています。
バージョン情報
.NET Framework
サポート対象 : 3.0,2.0,1.1,1.0
参照
関連項目
HtmlInputButton クラス
HtmlInputButton メンバ
System.Web.UI.HtmlControls 名前空間