[mapguide-internals] Problem with programatic changes of layers

[VOLZ Mark (FN)]

Folks,
 
I'm using the MGE 2010 (using a basic web layout) and I am having some
problems when I modifiy a layer via a piece of php (and I'm not getting
much joy from ADSK).
 
The scenerio;
 
1) From another app the user launches a mapguide session via a url call
which contains a unique id for the particualar piece of plant they wish
to view i.e.
http://<server_name>/mapguide2010/feederstat/navnet-switchzone.php?Paren
tId=60005615
2) The navnet-switchzone.php creates and logs into a mapguide session.
3) This page then calls another page passing the ParentID, session id, &
mapname variables. 
4) The second page has 2 functions firstly to set a layer filter and
secondly to make that layer invisible in the layer legend.
5) The first page then zooms to the extents as calculated via an mbr
query on Oracle spatial.
 
Simple enough.
 
My problem is the second action of the second php page i.e. setting the
layer to invisible in the layer legend. It does do it after the user
performs a zoom or pan command but it is in the layer legend when the
page first loads which I don't want.
 
Things I have tried;
 
1) Adding the layer to the library map with the filter set to -1 and
turning off the layer legend visiblity. - no luck
2) doing a second zoom when the page is first loaded i.e. log into the
seession zoom to a scale of (truescale * 1.1) modify the layer then zoom
to true scale. - no luck
 
Any ideas?
 
Below is the code i am using to modify the layer.
 
Any help would be greatly appreciated.
 
Mark
 
// change  HV_isol_dev_parent layer
 $resId = new
MgResourceIdentifier('Library://FeederStat/Layers/HV_isol_dev_parent.Lay
erDefinition');
 $byteReader = $resourceService->GetResourceContent($resId);
 $layerXML = $byteReader->ToString();
 $doc = DOMDocument::loadXML($layerXML);
 $GridNode = $doc->getElementsByTagName('GridLayerDefinitionType');
 $FilterNode = $doc->getElementsByTagName('Filter');
 $FilterNode->item(0)->nodeValue = "ECORP_ASSET_ID = ".$parentId;
 
 $LayerDefinition = $doc->saveXML();
 $byteSource = new MgByteSource($LayerDefinition,
strlen($LayerDefinition));
 $byteSource->SetMimeType(MgMimeType::Xml);
 
 $layerName="HV_isol_dev_parent";
 $sessionLayer =
"Session:".$sessionId."//".$layerName.".LayerDefinition";
 $sessResId = new  MgResourceIdentifier($sessionLayer);
 $resourceService->SetResource($sessResId, $byteSource->GetReader(),
null);
 
 $newLayer = new MgLayer($sessResId,$resourceService);
 $newLayer->SetName($layerName);
 $newLayer->SetVisible(true);
 $newLayer->SetLegendLabel($layerName);
 $newLayer->SetDisplayInLegend(false);
 
 $layerCollection = $map->GetLayers();
 $layerCount = $layerCollection->GetCount();
 $modelLayerIndex = $layerCount-2;
 if ($layerCollection->Contains("HV_isol_dev_parent"))
 {
    $selLayerIndex = $layerCollection->IndexOf("HV_isol_dev_parent");
    $modelLayerIndex = $selLayerIndex;
    $layerCollection->RemoveAt($selLayerIndex);
 }
 // Add Model layer to collection
 if (! $layerCollection->Contains($layerName))
  {
  $layerCollection->Insert($modelLayerIndex,$newLayer);
  // $layerCollection->Insert($layerCount-2,$newLayer);
  }
 
 

 
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