The ImageMap control in ASP.NET 2.0 and onward versions can be used to create an image that contains defined hot spot regions. When a user clicks a hot spot region, the control can either generate a post back to the server or navigate to a specified URL.

There are three kinds of hot spot regions defined in ImageMap control.

The RectangleHotSpot defines rectangular hot spot regions. The CircleHotSpotdefines circle-shaped ones and the PolygonHotSpot is used for irregularly shaped hot spot area.

Let's have a look at one example:

Map.aspx

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="map.aspx.cs" Inherits="map" %>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html xmlns="http://www.w3.org/1999/xhtml">
  5. <head runat="server">
  6. <title>Untitled Page</title>
  7. </head>
  9. <body>
  10. <form id="form1" runat="server">
  11. <div>
  12. <table>
  13. <tr>
  14. <td colspan="4">
  15. <asp:ImageMap ID="india" runat="server" ImageUrl="~/Map.jpg" Height="500px" Width="887px" HotSpotMode="PostBack" OnClick="india_Click" BackColor="#C0C000" BorderColor="DarkSlateGray" ForeColor="Red">
  16. <asp:CircleHotSpot Radius="7" X="215" Y="125" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="bhuj" AlternateText="Bhuj" />
  17. <asp:CircleHotSpot Radius="7" X="525" Y="95" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="patan" />
  18. <asp:CircleHotSpot Radius="7" X="565" Y="45" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="ambaji" />
  19. <asp:CircleHotSpot Radius="7" X="525" Y="150" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="me" />
  20. <asp:CircleHotSpot Radius="7" X="625" Y="120" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="him" />
  21. <asp:CircleHotSpot Radius="7" X="495" Y="195" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="sure" />
  22. <asp:CircleHotSpot Radius="7" X="565" Y="195" HotSpotMode="PostBack" NavigateUrl="~/map.aspx" PostBackValue="ahd" /> </asp:ImageMap>
  23. </td>
  24. <td colspan="2" style="width: 364px">
  25. <asp:Panel ID="p1" runat="server" Height="20px" Visible="false">
  26. <asp:Label ID="lbl1" Text="CITY:Bhuj STATE:Gujarat" runat="server" Width="162px" Height="57px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  27. </asp:Panel>
  28. <asp:Panel ID="p2" runat="server" Height="18px" Visible="false">
  29. <asp:Label ID="lbl2" Text="CITY:Patan STATE:Gujarat" runat="server" Width="162px" Height="45px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  30. </asp:Panel>
  31. <asp:Panel ID="p3" runat="server" Height="16px" Visible="false">
  32. <asp:Label ID="lbl3" Text="CITY:Ambaji STATE:Gujarat" runat="server" Width="160px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  33. </asp:Panel>
  34. <asp:Panel ID="p4" runat="server" Height="14px" Visible="false">
  35. <asp:Label ID="lbl4" Text="CITY:Mehsana STATE:Gujarat" runat="server" Width="161px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  36. </asp:Panel>
  37. <asp:Panel ID="p5" runat="server" Height="14px" Visible="false">
  38. <asp:Label ID="lbl5" Text="CITY:Himatnagar STATE:Gujarat" runat="server" Width="161px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  39. </asp:Panel>
  40. <asp:Panel ID="p6" runat="server" Height="14px" Visible="false">
  41. <asp:Label ID="lbl6" Text="CITY:Surendranagar STATE:Gujarat" runat="server" Width="90px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  42. </asp:Panel>
  43. <asp:Panel ID="p7" runat="server" Height="14px" Visible="false">
  44. <asp:Label ID="lbl7" Text="CITY:Ahemdabad STATE:Gujarat" runat="server" Width="162px" BackColor="MediumVioletRed" Font-Bold="True" Font-Size="Larger" ForeColor="Blue"></asp:Label>
  45. </asp:Panel>
  46. </td>
  47. </tr>
  48. </table>
  49. </div>
  50. </form>
  51. </body>
  53. </html>
Map.aspx.cs
  1. using System;
  2. using System.Data;
  3. using System.Configuration;
  4. using System.Collections;
  5. using System.Web;
  6. using System.Web.Security;
  7. using System.Web.UI;
  8. using System.Web.UI.WebControls;
  9. using System.Web.UI.WebControls.WebParts;
  10. using System.Web.UI.HtmlControls;
  12. public partial class map : System.Web.UI.Page
  13. {
  15. protected void india_Click(object sender, ImageMapEventArgs e)
  16. {
  17. string aa = e.PostBackValue;
  18. if(aa=="bhuj")
  19. {
  20. p1.Visible =true ;
  21. p2.Visible = false;
  22. p3.Visible = false;
  23. p4.Visible = false;
  24. p5.Visible = false;
  25. p6.Visible = false;
  26. p7.Visible = false;
  27. }
  28. else if(aa=="patan")
  29. {
  30. p1.Visible =false ;
  31. p2.Visible =true ;
  32. p3.Visible = false;
  33. p4.Visible = false;
  34. p5.Visible = false;
  35. p6.Visible = false;
  36. p7.Visible = false;
  37. }
  39. else if (aa == "ambaji")
  40. {
  41. p1.Visible = false;
  42. p2.Visible = false;
  43. p3.Visible = true;
  44. p4.Visible = false;
  45. p5.Visible = false;
  46. p6.Visible = false;
  47. p7.Visible = false;
  49. }
  50. else if (aa == "him")
  51. {
  52. p1.Visible = false;
  53. p2.Visible = false;
  54. p3.Visible = false ;
  55. p5.Visible = true;
  56. p4.Visible = false;
  57. p6.Visible = false;
  58. p7.Visible = false;
  61. }
  63. else if (aa == "me")
  64. {
  65. p1.Visible = false;
  66. p2.Visible = false;
  67. p3.Visible = false ;
  68. p4.Visible = true;
  69. p5.Visible = false;
  70. p6.Visible = false;
  71. p7.Visible = false;
  72. }
  75. else if (aa == "sure")
  76. {
  77. p1.Visible = false;
  78. p2.Visible = false;
  79. p3.Visible = false;
  80. p5.Visible = false ;
  81. p4.Visible = false;
  82. p6.Visible = true;
  83. p7.Visible = false;
  84. }
  86. else if (aa == "ahd")
  87. {
  88. p1.Visible = false;
  89. p2.Visible = false;
  90. p3.Visible = false;
  91. p5.Visible = false ;
  92. p4.Visible = false;
  93. p7.Visible = true;
  94. p6.Visible = false;
  96. }
  98. }
  99. }
Output:

Output