MultiView.OnActiveViewChanged Method
Assembly: System.Web (in system.web.dll)
The ActiveViewChanged event is raised when the active View control within a MultiView control changes between posts to the server, and you can provide a custom handler for this event.
Raising an event invokes the event handler through a delegate. For more information, see How to: Consume Events in a Web Forms Application.
The OnActiveViewChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors When overriding OnActiveViewChanged in a derived class, be sure to call the base class's OnActiveViewChanged method so that registered delegates receive the event.The following example demonstrates how to specify and code an event handler for the ActiveViewChanged event of a MultiView control. When the active view changes, a message is displayed in a Label control on the page.
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| The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model. |
<%@ Page Language="VB" %> <html> <head> <script runat="server"> Sub MultiView1_ActiveViewChanged(ByVal sender As Object, ByVal e As System.EventArgs) Dim activeView As String activeView = MultiView1.GetActiveView.ID ActiveViewLabel.Text = "The ActiveViewChanged event was raised." + _ "<br>" + "The active view is set to " + activeView End Sub Sub LinkButton_Command(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.CommandEventArgs) ' Determine which link button was clicked ' and set the active view to ' the view selected by the user. Select Case (e.CommandArgument) Case "DefaultView" MultiView1.SetActiveView(DefaultView) Case "News" MultiView1.SetActiveView(NewsView) Case "Shopping" MultiView1.SetActiveView(ShoppingView) End Select End Sub </script> </html> <body> <form ID="Form1" runat="server"> <h3>MultiView.ActiveViewChangedEvent Example</h3> <asp:MultiView id="MultiView1" ActiveViewIndex=0 OnActiveViewChanged="MultiView1_ActiveViewChanged" runat="Server"> <asp:View id="DefaultView" runat="Server"> <asp:Panel id="DefaultViewPanel" Width="330px" BackColor="#C0C0FF" BorderColor="#404040" BorderStyle="Double" runat="Server"> <asp:Label id="DefaultLabel1" Font-bold="true" Font-size="14" Text="The Default View" runat="Server"> </asp:Label> <asp:BulletedList id="DefaultBulletedList1" BulletStyle="Disc" DisplayMode="Hyperlink" Target="_blank" runat="Server"> <asp:ListItem Value="http://www.microsoft.com">Today's Weather</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Today's Stock Quotes</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Today's News Headlines</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Today's Featured Shopping</asp:ListItem> </asp:BulletedList> <hr> <asp:Label id="DefaultLabel2" Font-size="12" Text="Click a link to display a different view:" runat="Server"> </asp:Label><br> <asp:LinkButton id="Default_NewsLink" Text="Go to News View" OnCommand="LinkButton_Command" CommandArgument="News" CommandName="Link" Width="150px" runat="Server"> </asp:LinkButton> <asp:LinkButton id="Default_ShoppingLink" Text="Go to Shopping View" OnCommand="LinkButton_Command" CommandArgument="Shopping" CommandName="Link" Width="150px" runat="server"> </asp:LinkButton><br><br> </asp:Panel> </asp:View> <asp:View id="NewsView" runat="Server"> <asp:Panel id="NewsPanel1" Width="330px" BackColor="#C0FFC0" BorderColor="#404040" BorderStyle="Double" runat="Server"> <asp:Label id="NewsLabel1" Font-bold="true" Font-size="14" Text="The News View" runat="Server"> </asp:Label> <asp:BulletedList id="NewsBulletedlist1" BulletStyle="Disc" DisplayMode="Hyperlink" Target="_blank" runat="Server"> <asp:ListItem Value="http://www.microsoft.com">Today's International Headlines</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Today's National Headlines</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Today's Local News</asp:ListItem> </asp:BulletedList> <hr> <asp:Label id="NewsLabel2" Font-size="12" Text="Click a link to display a different view:" runat="Server"> </asp:Label><br> <asp:LinkButton id="News_DefaultLink" Text="Go to the Default View" OnCommand="LinkButton_Command" CommandArgument="DefaultView" CommandName="Link" Width="150px" runat="Server"> </asp:LinkButton> <asp:LinkButton id="News_ShoppingLink" Text="Go to Shopping View" OnCommand="LinkButton_Command" CommandArgument="Shopping" CommandName="Link" Width="150px" runat="Server"> </asp:LinkButton><br><br> </asp:Panel> </asp:View> <asp:View id="ShoppingView" runat="Server"> <asp:Panel id="ShoppingPanel1" Width="330px" BackColor="#FFFFC0" BorderColor="#404040" BorderStyle="Double" runat="Server"> <asp:Label id="ShoppingLabel1" Font-Bold="true" Font-size="14" Text="The Shopping View" runat="Server"> </asp:Label> <asp:BulletedList id="ShoppingBulletedlist1" BulletStyle="Disc" DisplayMode="Hyperlink" Target="_blank" runat="Server"> <asp:ListItem Value="http://www.microsoft.com">Shop for Home and Garden </asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Shop for Women's Fashions</asp:ListItem> <asp:ListItem Value="http://www.microsoft.com">Shop for Men's Fashions</asp:ListItem> </asp:BulletedList> <hr> <asp:Label id="ShoppingLabel2" Font-size="12" Text="Click a link to display a different view:" runat="Server"> </asp:Label><br> <asp:LinkButton id="Shopping_DefaultLink" Text="Go to the Default View" OnCommand="LinkButton_Command" CommandArgument="DefaultView" CommandName="Link" Width="150px" runat="Server"> </asp:LinkButton> <asp:LinkButton id="Shopping_NewsLink" Text="Go to News View" OnCommand="LinkButton_Command" CommandArgument="News" CommandName="Link" Width="150px" runat="Server"> </asp:LinkButton><br><br> </asp:Panel> </asp:View> </asp:MultiView> <hr> <asp:Label id="ActiveViewLabel" BorderStyle=None Font-Size=Small BackColor="#ffff66" runat="Server" > </asp:Label> </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
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
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