RectangleHotSpot.Left Property
Definition
Important
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Gets or sets the x-coordinate of the left side of the rectangular region defined by this RectangleHotSpot object.
public:
property int Left { int get(); void set(int value); };public int Left { get; set; }member this.Left : int with get, setPublic Property Left As IntegerProperty Value
The x-coordinate of the left side of the rectangular region defined by this RectangleHotSpot object. The default is 0.
Examples
The following code example demonstrates how to declaratively create an ImageMap control that contains two RectangleHotSpot objects. One RectangleHotSpot object is created declaratively and its properties, including the Left property, are set declaratively. The other RectangleHotSpot object is created programmatically and its properties, including the Left property, are set programmatically. 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 Page_Load(object sender, EventArgs e)
{
// Programmatically create a RectangleHotSpot.
RectangleHotSpot Rectangle1 = new RectangleHotSpot();
// Set properties on Rectangle1.
Rectangle1.Top = 0;
Rectangle1.Left = 0;
Rectangle1.Bottom = 200;
Rectangle1.Right = 200;
Rectangle1.PostBackValue = "Yes";
Rectangle1.AlternateText = "Vote yes";
// Add the RectangleHotSpot object to the
// Vote ImageMap control's HotSpotCollection.
Vote.HotSpots.Add(Rectangle1);
}
void VoteMap_Clicked(object sender, ImageMapEventArgs e)
{
// When a user clicks the "Yes" hot spot,
// display the hot spot's value.
if (e.PostBackValue == "Yes")
Message1.Text = "You selected " + e.PostBackValue + ".";
else if (e.PostBackValue == "No")
// When a user clicks the "No" hot spot,
// display the hot spot's value.
Message1.Text = "You selected " + e.PostBackValue + ".";
else
Message1.Text = "You did not click a valid hot spot region.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot Properties Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot Properties Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Programmatically create a RectangleHotSpot.
Dim Rectangle1 As New RectangleHotSpot
' Set properties on Rectangle1.
Rectangle1.Top = 0
Rectangle1.Left = 0
Rectangle1.Bottom = 200
Rectangle1.Right = 200
Rectangle1.PostBackValue = "Yes"
Rectangle1.AlternateText = "Vote yes"
' Add the RectangleHotSpot object to the
' Vote ImageMap control's HotSpotCollection.
Vote.HotSpots.Add(Rectangle1)
End Sub
Sub VoteMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
' When a user clicks the "Yes" hot spot,
' display the hot spot's value.
If (e.PostBackValue = "Yes") Then
Message1.Text = "You selected " & e.PostBackValue & "."
' When a user clicks the "No" hot spot,
' display the hot spot's value.
ElseIf (e.PostBackValue = "No") Then
Message1.Text = "You selected " & e.PostBackValue & "."
Else
Message1.Text = "You did not click a valid hot spot region."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot Properties Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot Properties Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
Remarks
The Left property allows you to get or set a value that represents the x-coordinate of the left side of the rectangular region defined by this RectangleHotSpot object. To completely define a RectangleHotSpot object, you must specify a value for the this property and for the Top, Right, and Bottom properties.
