[mapguide-users] selectionXml - 1.time fast..then very slow...ZoomToView

Fri Nov 24 10:38:31 EST 2006

The most common problem we have seen that exhibits such behaviour is
using a FeatureReader and not closing it after finishing with it. In
this case after the line of code:

$selection->AddFeatures($layer, $featureReader, 0);

You might try a $featureReader->Close();

This of course assumes the reader is no longer needed.

Dave

-----Original Message-----
From: Farah [mailto:farah at egovernments.org] 
Sent: Friday, November 24, 2006 1:53 AM
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] selectionXml - 1.time fast..then very
slow...ZoomToView

Hi...

I am having a similar problem.
1.I do a query on a temporary layer and select a feature in it,
programmatically and then zoom to it with the help of setSelectionXml.
This works fine.

2. I then clear the selection before performing a new query on the
temporary source and then try to do the same as step 1.

3. However, the application hangs when I try to update the temporary
feature source with the new features.

4. This doesn't happen if I don't do SetSelectionXml. So I am guessing
that by selecting a feature in the temporary layer, the feature source
is some how getting locked. So the next time I try to update it, it
hangs.

5. I tried to delete the feature source and layer every time I perform a
new search and create it again. However, when I try to delete the
feature source, it throws a file IO Exception. This error does not
happen if no selection had been made previously!

Any one has any pointers? :-)

farah

-----Original Message-----
From: Maciej Skorczewski [mailto:maciej.skorczewski at procad.pl]
Sent: Friday, November 24, 2006 1:40 PM
To: users at mapguide.osgeo.org
Subject: [mapguide-users] selectionXml - 1.time fast..then very
slow...ZoomToView

hello all!

i use (in php) this code to make xml of selected object...it works creat
when i use it first time(it is very fast)...then when i clik another
search results(streets and home)- so i use this script one more time -
my browser (FF and IE) stop working on 10-20 sec. user can't make any
action... why it is so? hove can i reload selectionXml (it is xml file )
  any sucestion?

what is faster? use pomQuery and selectionXml

or

ZoomToView(x, y, scale, refresh) ?

<?
$pomQuery->SetFilter("NRBUDP_ID = '$nrbudp_id' and
NUMER_DOMU='$numer_domu'");

$pomResId = new
MgResourceIdentifier("Library://mymap/Data/Nrbudp.FeatureSource");

$featureReader = $featureService->SelectFeatures($pomResId,
"SDF_2_Schema:Nrbudp", $pomQuery);

$layer = $map->GetLayers()->GetItem('Nrbudp');
$selection = new MgSelection($map);
$selection->AddFeatures($layer, $featureReader, 0);
$selectionXml = $selection->ToXml();
echo "<script type='text/javascript'>\n function OnPageLoad() {\n";
echo "selectionXml = '$selectionXml';\n 
parent.SetSelectionXML(selectionXml);\n";
echo "}\n</script>";
?>
then

i call in <body onload="OnPageLoad()">
-- 
Maciej Skorczewski

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