ImageMap.Click Evento
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
public:
event System::Web::UI::WebControls::ImageMapEventHandler ^ Click;public event System.Web.UI.WebControls.ImageMapEventHandler Click;member this.Click : System.Web.UI.WebControls.ImageMapEventHandler Public Custom Event Click As ImageMapEventHandler Tipo de evento
Ejemplos
En el ejemplo de código siguiente se muestra cómo crear un ImageMap control que contenga dos RectangleHotSpot objetos. La ImageMap.HotSpotMode propiedad se establece HotSpotMode.PostBacken , lo que hace que la página vuelva a publicar en el servidor cada vez que un usuario haga clic en una de las regiones de acceso frecuente. El VoteMap_Clicked controlador de eventos controla el evento click del ImageMap control . Para que este ejemplo funcione correctamente, debe proporcionar su propia imagen para la ImageUrl propiedad y actualizar la ruta de acceso a la imagen correctamente para que la aplicación pueda localizarla.
<%@ 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 VoteMap_Clicked (Object sender, ImageMapEventArgs e)
{
string coordinates;
string hotSpotType;
int yescount = ((ViewState["yescount"] != null)? (int)ViewState["yescount"] : 0);
int nocount = ((ViewState["nocount"] != null)? (int)ViewState["nocount"] : 0);
// When a user clicks the "Yes" hot spot,
// display the hot spot's name and coordinates.
if (e.PostBackValue.Contains("Yes"))
{
yescount += 1;
coordinates = Vote.HotSpots[0].GetCoordinates();
hotSpotType = Vote.HotSpots[0].ToString ();
Message1.Text = "You selected " + hotSpotType + " " + e.PostBackValue + ".<br />" +
"The coordinates are " + coordinates + ".<br />" +
"The current vote count is " + yescount.ToString() +
" yes votes and " + nocount.ToString() + " no votes.";
}
// When a user clicks the "No" hot spot,
// display the hot spot's name and coordinates.
else if (e.PostBackValue.Contains("No"))
{
nocount += 1;
coordinates = Vote.HotSpots[1].GetCoordinates();
hotSpotType = Vote.HotSpots[1].ToString ();
Message1.Text = "You selected " + hotSpotType + " " + e.PostBackValue + ".<br />" +
"The coordinates are " + coordinates + ".<br />" +
"The current vote count is " + yescount.ToString() +
" yes votes and " + nocount.ToString() + " no votes.";
}
else
{
Message1.Text = "You did not click a valid hot spot region.";
}
ViewState["yescount"] = yescount;
ViewState["nocount"] = nocount;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="head1" runat="server">
<title>ImageMap Class Post Back Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ImageMap Class Post Back Example</h3>
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
width="400"
height="200"
alternatetext="Vote Yes or No"
hotspotmode="PostBack"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="0"
bottom="200"
right="200"
postbackvalue="Yes"
alternatetext="Vote yes">
</asp:RectangleHotSpot>
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br /><br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
<%@ 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 VoteMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
Dim coordinates As String
Dim hotSpotType As String
Dim yescount As Integer
Dim nocount As Integer
If (ViewState("yescount") IsNot Nothing) Then
yescount = Convert.ToInt32(ViewState("yescount"))
Else
yescount = 0
End If
If (ViewState("nocount") IsNot Nothing) Then
nocount = Convert.ToInt32(ViewState("nocount"))
Else
nocount = 0
End If
' When a user clicks the "Yes" hot spot,
' display the hot spot's name and coordinates.
If (e.PostBackValue.Contains("Yes")) Then
yescount += 1
coordinates = Vote.HotSpots(0).GetCoordinates()
hotSpotType = Vote.HotSpots(0).ToString()
Message1.Text = "You selected " & hotSpotType & " " & e.PostBackValue & ".<br />" & _
"The coordinates are " & coordinates & ".<br />" & _
"The current vote count is " & yescount.ToString() & _
" yes votes and " & nocount.ToString() & " no votes."
' When a user clicks the "No" hot spot,
' display the hot spot's name and coordinates.
ElseIf (e.PostBackValue.Contains("No")) Then
nocount += 1
coordinates = Vote.HotSpots.Item(1).GetCoordinates()
hotSpotType = Vote.HotSpots.Item(1).ToString()
Message1.Text = "You selected " & hotSpotType & " " & e.PostBackValue & ".<br />" & _
"The coordinates are " & coordinates & ".<br />" & _
"The current vote count is " & yescount.ToString() & _
" yes votes and " & nocount.ToString() & " no votes."
Else
Message1.Text = "You did not click a valid hot spot region."
End If
ViewState("yescount") = yescount
ViewState("nocount") = nocount
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="head1" runat="server">
<title>ImageMap Class Post Back Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ImageMap Class Post Back Example</h3>
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
width="400"
height="200"
alternatetext="Vote Yes or No"
hotspotmode="PostBack"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="0"
bottom="200"
right="200"
postbackvalue="Yes"
alternatetext="Vote yes">
</asp:RectangleHotSpot>
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br /><br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
Comentarios
El Click evento se genera cuando se hace clic en un HotSpot objeto de un ImageMap control. Para permitir que genere HotSpot el Click evento, primero debe establecer la HotSpotMode propiedad en el ImageMap control o la HotSpotMode propiedad del HotSpot objeto HotSpotMode.Postbacken .
Para controlar mediante programación las acciones realizadas cuando se hace clic en un postback HotSpot , proporcione un controlador de eventos para el Click evento que contiene el código que se va a ejecutar cuando se genere el evento.
Cuando se genera un evento, se invoca el controlador de eventos a través de un delegado. Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.
