[mapguide-users] Re: How to use setselection in fusion?

Wed May 5 12:21:14 EDT 2010

That is what I am trying to do right now. I am working with .NET. So I will
share what I am doing and maybe that will help :-)

1. Build Selection XML

Note: searchString is your query (ID==1 || ID==2).

            var mgMapName = requestParams["mapName"];
            var mgSessionId = requestParams["sessionId"];

            // Initialize the web-tier.
            var realPath =
this.Request.ServerVariables["APPL_PHYSICAL_PATH"];
            var configPath = realPath + "..\\webconfig.ini";
            MapGuideApi.MgInitializeWebTier(configPath);

            // Connect to the site.
            var userInfo = new MgUserInformation(mgSessionId);
            var conn = new MgSiteConnection();
            conn.Open(userInfo);

            // get the map
            var map = new MgMap(conn);
            map.Open(mgMapName);

            // Perform any necessary transforms on the layer name or ids
            var mapObjects =
TransformInputLayer(requestParams["objectTypes"].Split(','),
requestParams["objectIds"].Split(','));

            // Select the objects on the map
            var layers = map.GetLayers();
            var selection = new MgSelection(map);

            foreach (var layer in layers)
            {
                var searchString = new StringBuilder();

                // Build out the search expression for the map layer
                foreach (var mapObject in mapObjects.Where(rec =>
rec.LayerName == layer.Name))
                {
                    if (searchString.Length > 0)
                    {
                        searchString.Append(" OR ");
                    }
                    searchString.AppendFormat("Id = '{0}'",
mapObject.ObjectId);
                }

                // Execte the search on the layer
                if (searchString.Length > 0)
                {
                    var displayIdQuery = new MgFeatureQueryOptions();
                    displayIdQuery.SetFilter(searchString.ToString());

                    var featureReader =
layer.SelectFeatures(displayIdQuery);
                    selection.AddFeatures(layer, featureReader,
AppSettings.MgSelectionFilterSize);
                    featureReader.Close();
                    featureReader.Dispose();
                }
            }

            var selectionXml = selection.ToXml();
            map.Dispose();

2. Now the fun part I am working on right now - pass your selection to
Fusion.
I used to have AJAX Viewer and I used following logic:
I have some aspx page (SetMapSelection.aspx)

SetMapSelection.aspx:

<head runat="server">
    <title>Set Map Selection Page</title>

    <script type="text/javascript" language="javascript"
src="http://localhost/mapguide/fusion/layers/MapGuide/MapGuideViewerApi.js"></script>

    <script type="text/javascript">
    // Emit the following function and assocate it with the onLoad event for 
    // the page so that it gets executed when this page loads in the
browser.       
    // The function calls the SetSelectionXML method on the Viewer Frame, 
    // which updates the current selection on the viewer and the server.
    function OnPageLoad() {
        var selectionXml =
document.getElementById("hfSelectionXml").getAttribute("value");

        parent.SetSelectionXML(selectionXml);
        parent.ExecuteMapAction(10);
        parent.ExecuteMapAction(99);

    }
    </script>

</head>
<body onload="OnPageLoad()">
    <form id="formM5Logic" runat="server">
    <div>
        <asp:TextBox ID="hfSelectionXml" runat="server"></asp:TextBox>
        <asp:HiddenField ID="HiddenFieldM5Logic"
runat="server"></asp:HiddenField>
    </div>
    </form>
</body>

SetMapSelection.aspx.cs:

        protected void Page_Load(object sender, EventArgs e)
        {
            // Disable the client side cache
            this.Response.Cache.SetCacheability(HttpCacheability.NoCache);

            // Write to session which page is loaded, this is used by the
context help to determine the 
            // approproiate help page to load.
            this.Session.Add(SessionStateBase.HELP_PAGE_REFERENCE,
this.Request.Path);

            // Get the input parameters into the selection
            var requestParams = this.Request.HttpMethod == "GET" ?
this.Request.QueryString : this.Request.Form;
            var mgMapName = requestParams["mapName"];
            var mgSessionId = requestParams["sessionId"];

            // Initialize the web-tier.
            var realPath =
this.Request.ServerVariables["APPL_PHYSICAL_PATH"];
            var configPath = realPath + "..\\webconfig.ini";
            MapGuideApi.MgInitializeWebTier(configPath);

            // Connect to the site.
            var userInfo = new MgUserInformation(mgSessionId);
            var conn = new MgSiteConnection();
            conn.Open(userInfo);

            // get the map
            var map = new MgMap(conn);
            map.Open(mgMapName);

            // Perform any necessary transforms on the layer name or ids
            var mapObjects =
TransformInputLayer(requestParams["objectTypes"].Split(','),
requestParams["objectIds"].Split(','));

            // Select the objects on the map
            var layers = map.GetLayers();
            var selection = new MgSelection(map);

            foreach (var layer in layers)
            {
                var searchString = new StringBuilder();

                // Build out the search expression for the map layer
                foreach (var mapObject in mapObjects.Where(rec =>
rec.LayerName == layer.Name))
                {
                    if (searchString.Length > 0)
                    {
                        searchString.Append(" OR ");
                    }
                    searchString.AppendFormat("Id = '{0}'",
mapObject.ObjectId);
                }

                // Execte the search on the layer
                if (searchString.Length > 0)
                {
                    var displayIdQuery = new MgFeatureQueryOptions();
                    displayIdQuery.SetFilter(searchString.ToString());

                    var featureReader =
layer.SelectFeatures(displayIdQuery);
                    selection.AddFeatures(layer, featureReader,
AppSettings.MgSelectionFilterSize);
                    featureReader.Close();
                    featureReader.Dispose();
                }
            }

            var selectionXml = selection.ToXml();
            map.Dispose();
            this.hfSelectionXml.Text = selectionXml;
        }

So as you can see - Page_Load builds selection XML and OnPageLoad passes it
to AJAX Viewer frame for further processing.

What I am puzzled with is to how to get a reference to Fusion, so I can pass
my selection to Fusion. Something like this:

    function OnPageLoad()
    {   
       var selectionXml =
document.getElementById("hfSelectionXml").getAttribute("value");

       var vf = top.document.getElementById('frmMap');

       vf.document.forms[0].GetFusionMapWidget.setSelection(selectionXml,
true); 
    }

Note:
In my app I have 2 iframes - Map Viewer and Application frame. frmMap is Map
Viewer frame:

        <iframe name="frmDefault" id="frmDefault" class="frameBoxGeneral"
frameborder="0" src="Pages/Loading.aspx">
        </iframe>
        <iframe name="frmMap" id="frmMap" src="<%= AppSettings.MgServicesUrl
%>/fusion/templates/mapguide/standard/index.html"
            class="frameBoxMap" frameborder="0"></iframe>

-- 
View this message in context: http://osgeo-org.1803224.n2.nabble.com/How-to-use-setselection-in-fusion-tp5001965p5009766.html
Sent from the MapGuide Users mailing list archive at Nabble.com.