Public Event Click As EventHandler
Dim instance As Button Dim handler As EventHandler AddHandler instance.Click, handler
public event EventHandler Click
public: virtual event EventHandler^ Click { void add (EventHandler^ value) sealed; void remove (EventHandler^ value) sealed; }
/** @event */ public final void add_Click (EventHandler value) /** @event */ public final void remove_Click (EventHandler value)
JScript 支持使用事件，但不支持进行新的声明。
当单击 Button 控件时会引发 Click 事件。当没有与 Button 控件（例如 Submit 按钮）关联的命令名时，通常使用该事件。
有关处理事件的更多信息，请参见 使用事件。
下面的代码示例演示如何指定和编写 Click 事件的事件处理程序，以便在用户单击 Button 控件时在网页上显示消息。
<%@ 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"> Sub GreetingBtn_Click(ByVal sender As Object, _ ByVal e As EventArgs) ' When the button is clicked, ' change the button text, and disable it. Dim clickedButton As Button = sender clickedButton.Text = "...button clicked..." clickedButton.Enabled = False ' Display the greeting label text. GreetingLabel.Visible = True End Sub </script> <html > <head runat="server"> <title>Button Example</title> </head> <body> <form id="form1" runat="server"> <div> <h3>Simple Button Example</h3> <asp:Button id="Button1" Text="Click here for greeting..." OnClick="GreetingBtn_Click" runat="server"/> <br /> <br /> <asp:Label ID="GreetingLabel" runat="server" Visible=false Text="Hello World!" /> </div> </form> </body> </html>
<%@ 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"> void Page_Load(Object sender, EventArgs e) { // Manually register the event-handling method for // the Click event of the Button control. Button1.Click += new EventHandler(this.GreetingBtn_Click); } void GreetingBtn_Click(Object sender, EventArgs e) { // When the button is clicked, // change the button text, and disable it. Button clickedButton = (Button)sender; clickedButton.Text = "...button clicked..."; clickedButton.Enabled = false; // Display the greeting label text. GreetingLabel.Visible = true; } </script> <html > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <h3>Simple Button Example</h3> <asp:Button id="Button1" Text="Click here for greeting..." OnClick="GreetingBtn_Click" runat="server"/> <br /> <br /> <asp:Label ID="GreetingLabel" runat="server" Visible=false Text="Hello World!" /> </div> </form> </body> </html>
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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。