ASP.NET Tutorial/ASP.net Controls/Events
Содержание
EventHandler
<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="Default_aspx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Server Controls</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>ASP.NET Server Controls</h1>
<h2>The date and time is <% =DateTime.Now.ToString() %>.</h2>
<asp:TextBox ID="txtBookName" runat="server" Width="250px">Enter a book name.</asp:TextBox>
<asp:Button ID="btnBookName" runat="server" Text="Book Name" OnClick="btnBookName_Click" />
<asp:Label ID="lblBookName" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class Default_aspx : System.Web.UI.Page
{
public Default_aspx()
{
Load += new EventHandler(Page_Load);
}
protected void btnBookName_Click(object sender, EventArgs e)
{
lblBookName.Text = txtBookName.Text;
}
}
Get event dispacher from event argument
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="EventTracker" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h3>List of events:</h3>
<asp:ListBox id="lstEvents"
runat="server"
Height="107px"
Width="355px">
</asp:ListBox><br/>
<br/><br/>
<h3>Controls being monitored for change events:</h3>
<asp:TextBox id="txt"
runat="server"
AutoPostBack="True"
OnTextChanged="CtrlChanged"></asp:TextBox><br/>
<br/>
<asp:CheckBox id="chk"
runat="server"
AutoPostBack="True"
OnCheckedChanged="CtrlChanged">
</asp:CheckBox><br/>
<br/>
<asp:RadioButton id="opt1"
runat="server"
GroupName="Sample"
AutoPostBack="True"
OnCheckedChanged="CtrlChanged">
</asp:RadioButton>
<asp:RadioButton id="opt2"
runat="server"
GroupName="Sample"
AutoPostBack="True"
OnCheckedChanged="CtrlChanged">
</asp:RadioButton>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class EventTracker : System.Web.UI.Page
{
protected void CtrlChanged(Object sender, EventArgs e)
{
string ctrlName = ((Control)sender).ID;
lstEvents.Items.Add(ctrlName + " Changed");
lstEvents.SelectedIndex = lstEvents.Items.Count - 1;
}
}
The Button_Command event (C#)
<%@ 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">
protected void Button_Command(Object sender,
System.Web.UI.WebControls.rumandEventArgs e)
{
switch (e.rumandName)
{
case ("DoSomething1"):
Response.Write("Button 1 was selected");
break;
case ("DoSomething2"):
Response.Write("Button 2 was selected");
break;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Buttons</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1"
Runat="server" Text="Button 1"
OnCommand="Button_Command"
CommandName="DoSomething1" />
<asp:Button ID="Button2"
Runat="server"
Text="Button 2"
OnCommand="Button_Command"
CommandName="DoSomething2" />
</div>
</form>
</body>
</html>
The Button_Command event (VB.net)
<%@ 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 Button_Command(ByVal sender As Object, _
ByVal e As System.Web.UI.WebControls.rumandEventArgs)
Select Case e.rumandName
Case "DoSomething1"
Response.Write("Button 1 was selected")
Case "DoSomething2"
Response.Write("Button 2 was selected")
End Select
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Buttons</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1"
Runat="server"
Text="Button 1"
OnCommand="Button_Command"
CommandName="DoSomething1" />
<asp:Button ID="Button2"
Runat="server"
Text="Button 2"
OnCommand="Button_Command"
CommandName="DoSomething2"/>
</div>
</form>
</body>
</html>
Two types of events for the button (C#)
<%@ Page Language="C#" %>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write("Postback!");
}
</script>
<script language="javascript" type="text/javascript">
function AlertHello()
{
alert("Hello ASP.NET");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Button Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1"
Runat="server"
Text="Button"
OnClientClick="AlertHello()"
OnClick="Button1_Click" />
</form>
</body>
</html>
Two types of events for the button (VB)
<%@ Page Language="VB" %>
<script runat="server">
Protected Sub Button1_Click(ByVal sender As Object, _
ByVal e As System.EventArgs)
Response.Write("Postback!")
End Sub
</script>
<script language="javascript" type="text/javascript">
function AlertHello()
{
alert("Hello ASP.NET");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Button Server Control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1"
Runat="server"
Text="Button"
OnClientClick="AlertHello()"
OnClick="Button1_Click" />
</form>
</body>
</html>