topic Re: WeightedClusterer Problem with latest API in ArcGIS API for Flex Questions

WeightedClusterer Problem with latest API

DeonaEvans — Wed, 21 Sep 2011 13:09:41 GMT

I upgraded to the latest API and am now getting an error in WeightedClusterer.as on line 113. The error is Error #1009: Cannot access a property or method of a null object reference. Could someone tell me what's on that line of code so I can determine what's missing in my code?

Re: WeightedClusterer Problem with latest API

BjornSvensson — Wed, 21 Sep 2011 18:42:36 GMT

if (graphicCollection.length)

Re: WeightedClusterer Problem with latest API

DeonaEvans — Wed, 21 Sep 2011 20:52:11 GMT

Thanks!

Could this line be changed for future to be this...
if ((graphicCollection != null) && (graphicCollection.length))

If I use the 2.3 api, with no code changes on my part, my code works. If I move to 2.4 api, it crashes on this line. I'm going to look in my code to see what I can do to fix this - maybe I haven't set something up correctly. Obviously the graphicCollection is null for some reason.

Re: WeightedClusterer Problem with latest API

StephenThornton — Thu, 20 Oct 2011 00:47:24 GMT

Hi Deona,

I'm having the same issue, did you manage to get around this problem in 2.4? If so could you share your solution.

Many Thanks,

Steve

Re: WeightedClusterer Problem with latest API

DeonaEvans — Thu, 20 Oct 2011 13:44:28 GMT

If I remember correctly, I just made sure that the graphcisCollection was not null even if it had a length of 0.

Re: WeightedClusterer Problem with latest API

SeanHarkins — Tue, 06 Dec 2011 14:22:36 GMT

I am also experiencing a similar problem when trying to add a FeatureLayer with a WeightedClusterer programmatically in a widget. If you have some sample code that shows where in the layer loading cycle you were checking if there are features it would be greatly appreciated.

Re: WeightedClusterer Problem with latest API

DasaPaddock — Tue, 06 Dec 2011 16:44:33 GMT

Sean,

Are you using API version 2.5?

Re: WeightedClusterer Problem with latest API

AndrewThomas — Mon, 15 Oct 2012 01:21:34 GMT

Can anyone provide more details on this?

I am having the same problem with the sampleFlexViewer using the 2.4 API (migration to 3.0 will be a couple of months away)

I am loading a widget which draws a graphics layer which may or may not have any graphics. If the graphics layer has never had any graphics in it and a cluster is assigned, the widget will fail to open: "WeightedClusterer.as on line 113. The error is Error #1009: Cannot access a property or method of a null object reference"

I can attach the cluster when the first graphic is added, but that's a bit ugly.

I'm not sure what to apply the test above to (if (graphicCollection.length)) ? Is this a modification to WeightedClusterer.as line 113?

If so, How do you actually modify your copy of the source library?

Or do I assign an empty (I.E. not null) graphicCollection to..?....the GraphicsLayer?? Is 'GraphicCollection' an arrayCollection of graphics?

Andrew