topic FeatureLayer selectFeatures only displays one feature in ArcGIS JavaScript Maps SDK Questions

FeatureLayer selectFeatures only displays one feature

SarahNoakes1 — Fri, 22 May 2015 13:56:31 GMT

I am creating a select features tool. It will work as follows:

The user draws a polygon
The draw-end event fires a function that runs an identifyTask to query the visible layers (NB. the identifyTask does NOT return the geometry).
The callback function from the identifyTask loops through the results set and creates four arrays - a list of the layers, a list of the ids, a list of the geometry types and a corresponding set of HTML tables detailing the feature attributes for that layer
The first array is used to create a drop-down list of layers, and when the selection changes, the display changes to display the relevant table.

So far so straightforward.

I also want the selected features to be highlighted when the layer selection is changed. To achieve this I have:

Created a featureLayer (using the id from the array) with the mode set as MODE_SELECTION
Set the selection symbol (uses the geometry type array to determine what type of symbol this should be)
Created a queryTask using the geometry of the polygon created in the first step
Run the selectFeatures method on the featureLayer using the queryTask
Added the featureLayer to the map.

However, only the first feature in each layer is highlighted. Yet if I look at the query results in the browser console I can see multiple results are returned.

What am I missing?

Thanks,

Sarah Noakes

Cornwall Council

Re: FeatureLayer selectFeatures only displays one feature

Anonymous User — Fri, 22 May 2015 18:45:59 GMT

Do you have any code you could share?

I did notice on the API page that for 'MODE_SELECTION' there are specific instructions about adding features:

Call the selectFeatures method.
Listen for the onSelectionComplete event.
Once onSelectionComplete fires, retrieve the selected features using the getSelectedFeatures method.

Re: FeatureLayer selectFeatures only displays one feature

SarahNoakes1 — Tue, 26 May 2015 13:46:38 GMT

Hi Sarah,

Thanks for getting back to me. I've figured it out now - It was to do with how I was creating the FeatureLayer. I had:

featureLayerSelectManyURL = intranetMapServiceURL + "/" + arrTableIds[0];

featureLayerSelectMany = new FeatureLayer(featureLayerSelectManyURL, {mode: FeatureLayer.MODE_SELECTION});

whereas what I needed was:

featureLayerSelectManyURL = intranetMapServiceURL + "/" + arrTableIds[0];

featureLayerSelectMany = new FeatureLayer(featureLayerSelectManyURL, {mode: FeatureLayer.MODE_SELECTION, outFields: ["*"]});

Goodness only knows why defining the outFields makes as difference - but it does! Only took the best part of a day ;o)

Cheers,

Sarah.