topic Re: Feature layer not getting drawn during a centerAndZoom in ArcGIS JavaScript Maps SDK Questions

Feature layer not getting drawn during a centerAndZoom

DougCollins — Tue, 24 Jan 2012 17:01:40 GMT

Greetings,

I have an application with 1 ArcGISTiledMapServiceLayer as the base layer and 1 ArcGISDynamicMapServiceLayer (feature layer) with points as the features. I have a JavaScript function that centers on a particular point and zooms to that point (i.e. map.centerAndZoom(centerPt, zoomLevel) ).

If the zoomLevel changes from one point to the next, then the points do not show up until I move the map a bit to change the extent a bit. I have tried using layer.hide() and layer.show() but the points still do not display until I move the map a bit.

Does anyone know of a way to refresh the feature layer so that the points will display?
Any help with this is greatly appreciated. I have run out of ideas!
It seems that there should be a refresh event in the API that would accomplish the same thing as physically moving the map.

Thanks,
Charlie

Re: Feature layer not getting drawn during a centerAndZoom

DougCollins — Tue, 24 Jan 2012 19:05:50 GMT

After looking through the forums I have come across similar posts, such as:
http://forums.arcgis.com/threads/3980-centerAndZoom-is-still-not-work-in-2.0?highlight=centerAndZoom

It appears that this problem still exists when you have both a TiledMapService and a DynamicMapService.

This is a show stopper.

Charlie

Re: Feature layer not getting drawn during a centerAndZoom

derekswingley1 — Tue, 24 Jan 2012 19:54:44 GMT

Hi Charlie,

If you're an ArcGISDynamicMapServiceLayer, that's not what we call a feature layer.

Can you provide a repro of this issue?

Re: Feature layer not getting drawn during a centerAndZoom

DougCollins — Wed, 25 Jan 2012 14:30:38 GMT

After searching back a couple of years through the forums, I finally found an answer for my problem. When defining a centerPoint for the centerAndZoom method, you must assign a SpatialReference to the centerPoint. Typically you define a SpatialReference for the Extent when setting up for this method, but it was not clear from the documentation that a SpatialReference must also be assigned to the centerPoint.

Thanks,
Charlie

Re: Feature layer not getting drawn during a centerAndZoom

derekswingley1 — Wed, 25 Jan 2012 18:18:01 GMT

It's implied that the mapPoint parameter for centerAndZoom needs a spatial reference as it links to the doc for esri.geometry.Point. SpatialReference for the point class is documented as required.

Anyway, glad you got it figured out!