[mapguide-users] Newbie - attempting to hidelayers based on checkbox in separate frame with AJAX Viewer

Wed Jul 27 16:51:55 EDT 2011

New guy here. I have a simple page with two frames, one frame has a
checkbox. I would like to use this checkbox to show/hide layers in the
second frame with the AJAX viewer. My weblayout has all frames turned off
except the viewer. When i uncheck the box it is not hiding the A-WALL-INT
layer, what am I doing wrong? This is difficult since most examples are aspx
pages called by the web layout. I need to do a custom layers pane due to the
need for 2-3 viewer frames in a single page. I do not want to force the user
to turn on/off the same layer in multiple frames. Here is my code in ASP.NET

*MILP2.ASPX (Main Page)*
<%@ Page language="c#" Debug="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Collections.Specialized" %>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.Globalization" %>
<%@ Import Namespace="OSGeo.MapGuide" %>

<%
   try
   {
       InitializeWebTier();
       MgUserInformation userInfo = new MgUserInformation(defaultUser,
defaultPassword);
       MgSite site = new MgSite();
       site.Open(userInfo);
       sessionId = site.CreateSession();
   }
   catch (Exception e)
   {
       Response.Write(e.Message);
   }
%>
<html>
<head>
       <title>Viewer Sample Application</title>
</head>
<frameset rows="100,*" frameborder="no" framespacing="0">
       &lt;frame id=&quot;titleFrame&quot; frameborder=&quot;no&quot;
marginwidth=&quot;0&quot; marginheight=&quot;0&quot;
scrolling=&quot;no&quot;
src=&quot;header.aspx?SESSION=&lt;%=sessionId%&gt;">
       &lt;frame id=&quot;viewerFrame&quot; frameborder=&quot;no&quot;
marginwidth=&quot;0&quot; marginheight=&quot;0&quot;
scrolling=&quot;no&quot;
src=&quot;../mapviewernet/ajaxviewer.aspx?SESSION=&lt;%=sessionId%&gt;&WEBLAYOUT=<%=webLayout%>">
</frameset>
</html>

*header.aspx (frame with checkbox)*
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="header.aspx.cs"
Inherits="header" Debug="true" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Collections.Specialized" %>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.Globalization" %>
<%@ Import Namespace="OSGeo.MapGuide" %>
<%@ Import Namespace="System.Web" %>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title></title>
</head>
<body>
   <form id="form1" runat="server">
   <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True"
       oncheckedchanged="CheckBox1_CheckedChanged" Text="A-WALL-INT"
       Checked="True" />
   <br />
   <asp:Label ID="Label4" runat="server"></asp:Label>
   <br />
   <asp:Label ID="Label5" runat="server"></asp:Label>
   <br />
   <p>Session Id is: <%=sessionId%></p>
   </form>
</body>
</html>

*Code behind file of header.aspx*
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using OSGeo.MapGuide;
using System.Collections.Specialized;
using System.IO;
using System.Text;

public partial class header : System.Web.UI.Page
{
   public string sessionId = "";

       protected void Page_Load(object sender, EventArgs e)
   {
       sessionId = Request.QueryString["SESSION"];
   }
   protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
   {
       CheckBox cb = sender as CheckBox;
       string isChecked = cb.Checked.ToString();
       string layer = cb.Text.ToString();
       Test_Output(layer, isChecked);
       toggleLayer(sessionId, layer, isChecked);
   }
   protected void Test_Output(string layer, string isChecked)
   {
       Label5.Text = "Layer name is: " + layer.ToString() + ", is it
checked? Answer is: " + isChecked.ToString();
   }
   protected void toggleLayer(string sessionId, string layer, string
isChecked)
   {
       try
       {
           InitializeWebTier();
           MgUserInformation userInfo = new MgUserInformation(sessionId);
           MgSiteConnection siteConnection = new MgSiteConnection();
           siteConnection.Open(userInfo);

           MgResourceService resourceService =
(MgResourceService)siteConnection.CreateService(MgServiceType.ResourceService);
           MgFeatureService featureService =
(MgFeatureService)siteConnection.CreateService(MgServiceType.FeatureService);
           MgMap map = new MgMap();
           map.Open(resourceService, "RUSHMMAF01");
           MgLayer existingLayer = GetLayerByName(map, "A-WALL-INT");
           if (isChecked == "true")
               existingLayer.SetVisible(true);
           else
               existingLayer.SetVisible(false);
           existingLayer.ForceRefresh();
           map.Save(resourceService);
       }
       catch (Exception e)
       {
           Response.Write(e.Message);
       }
   }
   void InitializeWebTier()
   {
       // Initialize web tier with the site configuration file.  The config
       // file should be in the same directory as this script.
       string s_basePath = Request.ServerVariables["APPL_PHYSICAL_PATH"];
       MapGuideApi.MgInitializeWebTier(s_basePath + "../webconfig.ini");
   }
   MgLayer GetLayerByName(MgMap map, String layerName)
   {
       MgLayer layer = null;
       for (int i = 0; i < map.GetLayers().GetCount(); i++)
       {
           MgLayer nextLayer = (MgLayer)map.GetLayers().GetItem(i);
           if (nextLayer.GetName().Equals(layerName))
           {
               layer = nextLayer;
               break;
           }
       }
       return layer;
   }
}

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