ImageMapEventArgs ImageMapEventArgs ImageMapEventArgs ImageMapEventArgs Class

Definizione

Fornisce i dati per l'evento Click di un controllo ImageMap.Provides data for the Click event of an ImageMap control.

public ref class ImageMapEventArgs : EventArgs
public class ImageMapEventArgs : EventArgs
type ImageMapEventArgs = class
    inherit EventArgs
Public Class ImageMapEventArgs
Inherits EventArgs
Ereditarietà
ImageMapEventArgsImageMapEventArgsImageMapEventArgsImageMapEventArgs

Esempi

Nell'esempio di codice riportato di seguito viene illustrato come creare un gestore Click eventi per l'evento.The following code example demonstrates how to create an event handler for the Click event. Il ImageMap controllo contiene due RectangleHotSpot oggetti.The ImageMap control contains two RectangleHotSpot objects. La ImageMap.HotSpotMode proprietà è impostata su HotSpotMode.PostBack, che fa sì che venga eseguito il postback della pagina al server ogni volta che un RectangleHotSpot utente fa clic su uno degli oggetti.The ImageMap.HotSpotMode property is set to HotSpotMode.PostBack, which causes the page to post back to the server each time a user clicks one of the RectangleHotSpot objects. L' Click evento viene gestito VoteMap_Clicked dal gestore eventi.The Click event is handled by the VoteMap_Clicked event handler. Esamina la PostBackValueproprietà, inviata nei RectangleHotSpot dati, per determinare l'oggetto associato all'evento. ImageMapEventArgs VoteMap_ClickedThe VoteMap_Clicked examines the PostBackValue property, sent in the ImageMapEventArgs data, to determine which RectangleHotSpot object is associated with the event. Per il corretto funzionamento di questo esempio, è necessario fornire un'immagine personalizzata per ImageUrl la proprietà e aggiornare il percorso dell'immagine in modo appropriato affinché possa essere individuato dall'applicazione.For this example to work correctly, you must supply your own image for the ImageUrl property and update the path to the image appropriately so that the application can locate it.

<%@ 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>

Commenti

L' Click evento viene generato quando si HotSpot fa clic su ImageMap un oggetto in un controllo.The Click event is raised when a HotSpot object in an ImageMap control is clicked. Per consentire a HotSpot un oggetto di generare Click l'evento, è innanzitutto necessario impostare la ImageMap.HotSpotMode proprietà o HotSpot.HotSpotMode su HotSpotMode.PostBack.To allow a HotSpot object to raise the Click event, you must first set either the ImageMap.HotSpotMode property or the HotSpot.HotSpotMode property to HotSpotMode.PostBack. Per controllare le azioni a livello di codice eseguite quando si fa HotSpot clic su un postback, fornire un gestore eventi per Click l'evento.To control the actions programmatically that are performed when a postback HotSpot is clicked, provide an event handler for the Click event.

Una PostBackValue proprietà archivia una stringa associata al comportamento HotSpot dell'oggetto quando viene selezionato.A PostBackValue property stores a string that is associated with the behavior of the HotSpot object when clicked. Questa stringa viene passata nei ImageMapEventArgs dati dell'evento HotSpot quando si fa clic su.This string is passed in the ImageMapEventArgs event data when the HotSpot is clicked.

Costruttori

ImageMapEventArgs(String) ImageMapEventArgs(String) ImageMapEventArgs(String) ImageMapEventArgs(String)

Inizializza una nuova istanza della classe ImageMapEventArgs.Initializes a new instance of the ImageMapEventArgs class.

Proprietà

PostBackValue PostBackValue PostBackValue PostBackValue

Ottiene l'oggetto String assegnato alla proprietà PostBackValue dell'oggetto HotSpot su cui è stato fatto clic.Gets the String assigned to the PostBackValue property of the HotSpot object that was clicked.

Metodi

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina se l'oggetto specificato è uguale all'oggetto corrente.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Funge da funzione hash predefinita.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Ottiene l'oggetto Type dell'istanza corrente.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crea una copia superficiale dell'oggetto Object corrente.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Restituisce una stringa che rappresenta l'oggetto corrente.Returns a string that represents the current object.

(Inherited from Object)

Si applica a

Vedi anche