[mapguide-users] Clearing Selections

[Scott Hameister]

I'm using this code from the Developers book , It' works fine, except it
grabs the correct objects, but doesn't release objects already selected.

How do I clear out the Selection in advance so that ONLY my new FILTERED
objects are in the selection.

 

Is there a selection.Clear() or selection.Remove() option to the webAPi
besides for only Adds.

 

I can't call the parent.mapFrame.ClearSelection() with javascript, because
it runs after the page has compiled and deletes the selection after its been
created.

 

$queryOptions = new MgFeatureQueryOptions();

$queryOptions->SetFilter("RNAME LIKE 'Schmitt%'");

$queryOptions->SetSpatialFilter('SHPGEOM',

$districtGeometry,

MgFeatureSpatialOperations::Inside);

// Get the features from the feature source,

// turn it into a selection, then save as XML.

$featureResId = new MgResourceIdentifier(

"Library://Samples/Sheboygan/Data/Parcels.FeatureSource");

$featureReader = $featureService->SelectFeatures(

$featureResId, "Parcels", $queryOptions);

Example: Setting the Active Selection | 53

$layer = $map->GetLayers()->GetItem('Parcels');

$selection = new MgSelection($map);

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

$selectionXml = $selection->ToXml();

echo 'Setting selection...';

}

catch (MgException $e)

{

echo $e->GetMessage();

echo $e->GetDetails();

}

?>

</body>

<script language="javascript">

<!-- Emit this 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()

{

selectionXml = '<?php echo $selectionXml; ?>';

parent.parent.SetSelectionXML(selectionXml);

}

</script>

</html>

 

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