CircleHotSpot Class
Defines a circular hot spot region in an ImageMap control. This class cannot be inherited.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
The CircleHotSpot type exposes the following members.
| Name | Description | |
|---|---|---|
 | AccessKey | Gets or sets the access key that allows you to quickly navigate to the HotSpot region. (Inherited from HotSpot.) |
| AlternateText | Gets or sets the alternate text to display for a HotSpot object in an ImageMap control when the image is unavailable or renders to a browser that does not support images. (Inherited from HotSpot.) |
| HotSpotMode | Gets or sets the behavior of a HotSpot object in an ImageMap control when the HotSpot is clicked. (Inherited from HotSpot.) |
| MarkupName | When overridden in a derived class, gets the string representation for the HotSpot object's shape. (Inherited from HotSpot.) |
| NavigateUrl | Gets or sets the URL to navigate to when a HotSpot object is clicked. (Inherited from HotSpot.) |
| PostBackValue | Gets or sets the name of the HotSpot object to pass in the event data when the HotSpot is clicked. (Inherited from HotSpot.) |
| Radius | Gets or sets the distance from the center to the edge of the circular region defined by this CircleHotSpot object. |
| TabIndex | Gets or sets the tab index of the HotSpot region. (Inherited from HotSpot.) |
| Target | Gets or sets the target window or frame in which to display the Web page content linked to when a HotSpot object that navigates to a URL is clicked. (Inherited from HotSpot.) |
| X | Gets or sets the x-coordinate of the center of the circular region defined by this CircleHotSpot object. |
| Y | Gets or sets the y-coordinate of the center of the circular region defined by this CircleHotSpot object. |
| Name | Description | |
|---|---|---|
| Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| GetCoordinates | Returns a string that represents the x- and y-coordinates of a CircleHotSpot object's center and the length of its radius. (Overrides HotSpot.GetCoordinates().) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| ToString | Returns the String representation of this instance of a HotSpot object. (Inherited from HotSpot.) |
| Name | Description | |
|---|---|---|
 | IStateManager.IsTrackingViewState | Infrastructure. Gets a value indicating whether the HotSpot object is tracking its view-state changes. (Inherited from HotSpot.) |
| IStateManager.LoadViewState | Infrastructure. Restores the HotSpot object's previously saved view state to the object. (Inherited from HotSpot.) |
| IStateManager.SaveViewState | Infrastructure. Saves the changes to the HotSpot object's view state since the last time the page was posted back to the server. (Inherited from HotSpot.) |
| IStateManager.TrackViewState | Infrastructure. Instructs the HotSpot region to track changes to its view state. (Inherited from HotSpot.) |
This class defines a circle-shaped hot spot region in an ImageMap control. To define the region of the CircleHotSpot object, set the X property to the value that represents the x-coordinate of the center of the circular region. Set the Y property to the value that represents the y-coordinate of the center of the circular region. Set the Radius property to the distance from the center of the circle to the edge.
When a CircleHotSpot control is clicked, the page either navigates to a URL, generates a post back to the server, or does nothing. The HotSpotMode property specifies this behavior. To navigate to a URL, set the HotSpotMode property to HotSpotMode.Navigate, and use the NavigateUrl property to specify the URL to navigate to. To post back to the server, set the HotSpotMode property to HotSpotMode.PostBack, and use the PostBackValue property to specify a name for the CircleHotSpot object. This name will be passed in the ImageMapEventArgs event data when the CircleHotSpot is clicked. If you want the CircleHotSpot object to have no behavior, set the HotSpotMode property to HotSpotMode.Inactive.
| Topic | Location |
|---|---|
| How to: Add ImageMap Web Server Controls to a Web Forms Page | Building ASP .NET Web Applications |
| How to: Add ImageMap Web Server Controls to a Web Forms Page | Building ASP .NET Web Applications |
The following code example demonstrates how to declaratively create an ImageMap control that contains two CircleHotSpot objects. The HotSpotMode property is set to HotSpotMode.Navigate, which causes the page to navigate to the specified URL each time a user clicks one of the hot spot regions. 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"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="head1" runat="server"> <title>ImageMap Class Navigate Example</title> </head> <body> <form id="form1" runat="server"> <h3>ImageMap Class Navigate Example</h3> <h4>Shopping Choices:</h4> <asp:imagemap id="Shop" imageurl="Images/ShopChoice.jpg" width="150" height="360" alternatetext="Shopping choices" runat="Server"> <asp:circlehotspot navigateurl="http://www.tailspintoys.com" x="75" y="290" radius="75" hotspotmode="Navigate" alternatetext="Shop for toys"> </asp:circlehotspot> <asp:circlehotspot navigateurl="http://www.cohowinery.com" x="75" y="120" radius="75" hotspotmode="Navigate" alternatetext="Shop for wine"> </asp:circlehotspot> </asp:imagemap> </form> </body> </html>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
