topic Re: Filtering a CSVLayer in ArcGIS API for Flex Questions

Filtering a CSVLayer

MapEnglish — Fri, 14 Dec 2012 19:41:27 GMT

Hi:

Is this possible? I've tried setting a definitionExpression with no luck - perhaps it just applies to a FeatureLayer from which it inherits. Also have tried setting a filter function on the graphicProvider property but the doc suggests this can't be done.

Any insight would be appreciated.

Thanks,
Matt English
Esri Canada

Re: Filtering a CSVLayer

DasaPaddock — Fri, 14 Dec 2012 19:49:48 GMT

You could use a renderer that doesn't define a symbol for the features that you don't want to be drawn.

Another option is to update the featureCollection's feature set after the layer has loaded and then reset the featureCollection property.

Re: Filtering a CSVLayer

MapEnglish — Mon, 17 Dec 2012 14:39:58 GMT

Hi:

So I have a new FeatureSet according to some business logic, and I pass it in to a new FeatureCollection and reset my CSVLayer with that collection:

myCSVLayer.featureCollection = new FeatureCollection(filteredFeatureSet, null);

However, the map still shows my original set of features. Do I need to do anything else here?

Thanks, Matt

Re: Filtering a CSVLayer

DasaPaddock — Mon, 17 Dec 2012 16:04:44 GMT

Try:

myCSVLayer.featureCollection = new FeatureCollection(filteredFeatureSet, new LayerDetails());

Having at least a default LayerDetails is required.

Re: Filtering a CSVLayer

MapEnglish — Mon, 17 Dec 2012 17:24:06 GMT

Works like a charm! If you're interested, we're upgrading the Flex Viewer at the following site:

http://top100projects.ca/

The data will now be fed from a web CSVLayer. Clicking on the pie chart will show you the filtering behaviour we're after.

Many thanks for this,
Matt