[mapguide-users] Problems with xmlSelection

[Jorge Rubio]

Hi Mark, the problems is here

ActiveSelection.GetLayers
returns nothing. That means ActiveSelection wasn't initialized?
Could be the class php file doesn't process properly the posted
xmlSelection....
I really don't understand what is wrong...



2007/7/13, Mark Pendergraft <markp at meadgilman.com>:
>
>  Well first off, I would open the Map with the siteconnection.
>
>
>
> After you create the new selection object with the XML selection like so:
>
>
>
> Dim Selection as New MgSelection(Map, mapSelection)
>
>
>
> You then need to find out what layers are selected, then generate a filter
> for each layer.
>
> Then you can use a featureReader to read the selected objects, and then
> your code can perform functions based off of the selection.
>
>
>
> Here is an example function in VB (sorry, but I have to translate your
> guy's php all the time, so I don't feel that bad)
>
>
>
> ''''''''''''''''''''''''''' Begin Code
> '''''''''''''''''''''''''''''''''''''''''''
>
>
>
> Function MakePolygonFromSelection(ByVal featureService As
> MgFeatureService, ByVal Map As MgMap, ByVal JobNo As String, ByVal XmlSel As
> String) As MgPropertyCollection
>
>
>
> ' Open the map with the XML selection that was passed through javascript
>
>         Dim ActiveSelection As New MgSelection(Map, XmlSel)
>
>                 ' Get the layers in the activeselection as a
> mgreadonlylayercollection
>
>         Dim Layers As MgReadOnlyLayerCollection =
> ActiveSelection.GetLayers
>
>
>
> ' I only want to use the selection if one object was selected…. If you
> wanted multiple objects, you would loop through the layers
>
> ' to find out which layers are selected.. then you could generate an array
> of strings containing the selections generated filter (like below)
>
>         If Not Layers.GetCount = 1 Then
>
>             ErrorMessage = "More than one object was selected"
>
>             Return Nothing
>
>             Exit Function
>
>         End If
>
>
>
>                 ' Now get the layer from the selection
>
>         Dim Layer As MgLayer = Map.GetLayers.GetItem(Layers.Item(0).Name)
>
>                 ' Generate the selection filter for the layer, which you
> will use to get the selected objects on that layer
>
>         Dim selectionFilter As String = ActiveSelection.GenerateFilter(Layer,
> Layer.FeatureClassName)
>
>
>
>                 ' create a new mgFeatureQueryOptions and set the filter to
> the selection filter obtained from the active selection set
>
>         Dim queryOptions As New MgFeatureQueryOptions
>
>         queryOptions.SetFilter(selectionFilter)
>
>
>
> ' now create the feature reader, and set it to obtain the objects from the
> active selection (using the layer, and the query options created using the
> generatefilter command
>
>         Dim fr As MgFeatureReader = featureService.SelectFeatures(New
> MgResourceIdentifier(Layer.GetFeatureSourceId), Layer.GetFeatureClassName,
> queryOptions)
>
>
>
> ' read the first feature
>
>         fr.ReadNext()
>
>
>
>                 'the rest of this code transfers the geometry from the
> selected feature to another feature source..
>
>                 ' this is where you would insert your code to act upon the
> map features that were selected.
>
>         Dim Geom As MgByteReader = fr.GetGeometry(
> Layer.GetFeatureGeometryName)
>
>         Dim geometryProperty As New MgGeometryProperty("Geometry", Geom)
>
>         Dim JobNoProperty As New MgStringProperty("JobNo", JobNo)
>
>
>
>         Dim propertyCollection As New MgPropertyCollection
>
>         propertyCollection.Add(geometryProperty)
>
>         propertyCollection.Add(JobNoProperty)
>
>
>
>         fr.Close()
>
>         fr.Dispose()
>
>
>
>                 ' this is the end of the function… you will also want to
> save your map back to the user session should you update anything on it.
>
>         Return propertyCollection
>
>     End Function
>
>
>
> ''''''''''''''''''''''''''' End Code
> '''''''''''''''''''''''''''''''''''''''''''
>
>
>
> Well, I hope that clears things up a bit.
>
>
>
> -Mark Pendergraft
>
>
>
> *From:* mapguide-users-bounces at lists.osgeo.org [mailto:
> mapguide-users-bounces at lists.osgeo.org] *On Behalf Of *Jorge Rubio
> *Sent:* Friday, July 13, 2007 10:41 AM
> *To:* MapGuide Users Mail List
> *Subject:* Re: [mapguide-users] Problems with xmlSelection
>
>
>
> My problems begin before to show selection. $mgSelection is not
> initialized!
>
>
>
>
> 2007/7/13, Scott Hameister <scotth at mpower-tech.com>:
>
> The map needs to be saved and refreshed before a selection can show
>
>
>
> *From:* mapguide-users-bounces at lists.osgeo.org [mailto:
> mapguide-users-bounces at lists.osgeo.org] *On Behalf Of *Jorge Rubio
> *Sent:* Friday, July 13, 2007 9:35 AM
> *To:* MapGuide Users Mail List
> *Subject:* [mapguide-users] Problems with xmlSelection
>
>
>
> Hi list
>
>
>
> I need to pass an xmlSlection to a php class in order to be used by a
> member function
>
>
>
> Using javascript I get xmlSelection
>
>
>
> var xmlSel = parent.parent.mapFrame.GetSelectionXML();
>
>
> I post the selection like this
>
>
>
> someParams + "&SELECTION=" + encodeURIComponent(xmlSel);
>
> I get the params at php class file like this
>
>
>
> $mgSessionId = ($_SERVER['REQUEST_METHOD'] == "POST")? $_POST['SESSION']:
> $_GET['SESSION'];
> $mapName = ($_SERVER['REQUEST_METHOD'] == "POST")? $_POST['MAPNAME']:
> $_GET['MAPNAME'];
> $mapSelection = rawurldecode(($_SERVER['REQUEST_METHOD'] == "POST")?
> $_POST['SELECTION']: $_GET['SELECTION']);
>
>
> so $mapSelection is an XML string.
>
>
>
> Then, I need to get that selection
>
>
>
> $featureService =
> $this->site->CreateService(MgServiceType::FeatureService);
> $resourceService =
> $this->site->CreateService(MgServiceType::ResourceService);
>
> $map = new MgMap();
> $map->Open($resourceService, $mapName);
> $mgSelection = new MgSelection($map,$mapSelection);
>
> None selection is created!!
>
> What I'm doing wrong?
>
> Thanks in advance.
>
>
> --
> Lic. Jorge Rubio
>
>
> _______________________________________________
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> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>
>
>
>
> --
> Lic. Jorge Rubio
>
> _______________________________________________
> mapguide-users mailing list
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>
>


-- 
Lic. Jorge Rubio
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