HtmlInputCheckBox.OnPreRender メソッド
アセンブリ: System.Web (system.web.dll 内)

Dim e As EventArgs Me.OnPreRender(e)


カスタム サーバー コントロールの OnPreRender メソッドをオーバーライドし、各 HtmlInputCheckBox コントロールに Title 属性が追加されるように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" %> <HTML> <HEAD> <title>Custom HtmlInputCheckBox - OnPreRender - Visual Basic Example</title> <script runat=server> Sub Button1_Click(sender As Object, e As EventArgs) Div1.InnerHtml = "" If HtmlInputCheckBox1.Checked = True Then Div1.InnerHtml = "You like basketball. " End If If HtmlInputCheckBox2.Checked = True Then Div1.InnerHtml += "You like football. " End If If HtmlInputCheckBox3.Checked = True Then Div1.InnerHtml += "You like soccer. " End If End Sub </script> </HEAD> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlInputCheckBox - OnPreRender - Visual Basic Example</h3> <P> Enter Interests:<br> <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox1" runat="server" type="checkbox" checked value="Basketball"> Basketball <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox2" runat="server" type="checkbox" value="Football"> Football <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox3" runat="server" type="checkbox" value="Soccer"> Soccer </P> <P> <input id="Button1" runat="server" type="button" value="Enter" OnServerClick="Button1_Click" name="Button1"> </P> <P> <DIV id="Div1" runat="server" style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" ms_positioning="FlowLayout" /> </P> </form> </body> </HTML>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %> <%@ Page Language="C#" AutoEventWireup="True" %> <HTML> <HEAD> <title>Custom HtmlInputCheckBox - OnPreRender - C# Example</title> <script runat=server> void Button1_Click(Object sender, EventArgs e) { Div1.InnerHtml = ""; if(HtmlInputCheckBox1.Checked == true) { Div1.InnerHtml = "You like basketball. "; } if(HtmlInputCheckBox2.Checked == true) { Div1.InnerHtml += "You like football. "; } if(HtmlInputCheckBox3.Checked == true) { Div1.InnerHtml += "You like soccer. "; } } </script> </HEAD> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlInputCheckBox - OnPreRender - C# Example</h3> <P> Enter Interests:<br> <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox1" runat="server" type="checkbox" checked value="Basketball"> Basketball <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox2" runat="server" type="checkbox" value="Football"> Football <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox3" runat="server" type="checkbox" value="Soccer"> Soccer </P> <P> <input id="Button1" runat="server" type="button" value="Enter" OnServerClick="Button1_Click" name="Button1"> </P> <P> <DIV id="Div1" runat="server" style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" ms_positioning="FlowLayout" /> </P> </form> </body> </HTML>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %> <%@ Page Language="VJ#" AutoEventWireup="True" %> <HTML> <HEAD> <title>Custom HtmlInputCheckBox - OnPreRender - C# Example</title> <script runat=server> void Button1_Click(Object sender, EventArgs e) { Div1.set_InnerHtml(""); if(HtmlInputCheckBox1.get_Checked() == true) { Div1.set_InnerHtml("You like basketball. "); } if(HtmlInputCheckBox2.get_Checked() == true) { Div1.set_InnerHtml(Div1.get_InnerHtml() + "You like football. "); } if(HtmlInputCheckBox3.get_Checked() == true) { Div1.set_InnerHtml(Div1.get_InnerHtml() + "You like soccer. "); } } //Button1_Click </script> </HEAD> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlInputCheckBox - OnPreRender - VJ# Example</h3> <P> Enter Interests:<br> <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox1" runat="server" type="checkbox" checked value="Basketball"> Basketball <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox2" runat="server" type="checkbox" value="Football"> Football <aspSample:CustomHtmlInputCheckBoxOnPreRender id="HtmlInputCheckBox3" runat="server" type="checkbox" value="Soccer"> Soccer </P> <P> <input id="Button1" runat="server" type="button" value="Enter" OnServerClick="Button1_Click" name="Button1"> </P> <P> <DIV id="Div1" runat="server" style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" ms_positioning="FlowLayout" /> </P> </form> </body> </HTML>
Imports System.Web Imports System.Security.Permissions Namespace Samples.AspNet.VB.Controls <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomHtmlInputCheckBoxOnPreRender Inherits System.Web.UI.HtmlControls.HtmlInputCheckBox Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs) ' Call the base class's OnPreRender method. MyBase.OnPreRender(e) ' Add a Title attribute to each HtmlInputCheckBox. Me.Attributes.Add("title", "If you like " + Me.Value + ", then select this check box.") 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 CustomHtmlInputCheckBoxOnPreRender : System.Web.UI.HtmlControls.HtmlInputCheckBox { protected override void OnPreRender(System.EventArgs e) { // Call the base class's OnPreRender method. base.OnPreRender(e); // Add a Title attribute to each HtmlInputCheckBox. this.Attributes.Add("title", "If you like " + this.Value + ", then select this check box."); } } }
package Samples.AspNet.JSL.Controls; public class CustomHtmlInputCheckBoxOnPreRender extends System.Web.UI.HtmlControls.HtmlInputCheckBox { protected void OnPreRender(System.EventArgs e) { // Call the base class's OnPreRender method. super.OnPreRender(e); // Add a Title attribute to each HtmlInputCheckBox. this.get_Attributes().Add("title", "If you like " + this.get_Value() + ", then select this check box."); } //OnPreRender } //CustomHtmlInputCheckBoxOnPreRender

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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