topic Re: Validate service for FeatureLayer in ArcGIS JavaScript Maps SDK Questions

Validate service for FeatureLayer

KlimChugunkin — Thu, 01 Nov 2012 04:49:18 GMT

Hello there!
I would appreciate it very much if you guys help me solve this issue:
I'm trying to create FeatureLayer like this
featureLayer = new esri.layers.FeatureLayer(featureServiceURL, featureLayerOptions);
the line above gives me an error: Unable to draw graphic (geometry:null, symbol:null): Unable to complete operation.
That's because featureServiceURL points to the server which does not exist or is inaccessible.
My question is: how to find out if the service is OK before creating FeatureLayer - in other words, how to validate service prior to FeatureLayer please?

Thanks in advance,
Klim

Re: Validate service for FeatureLayer

__Rich_ — Thu, 01 Nov 2012 08:04:53 GMT

Just make any kind of request to the service and handle the response or (importantly in your case!) the error.

Re: Validate service for FeatureLayer

SteveCole — Thu, 01 Nov 2012 16:55:47 GMT

Like Rich states, maybe you can attempt to access the service before really needing it. Perhaps you can alter the code snippit found in the API documentation for ESRI.Request to verify that the service is up and running: esri.request

Re: Validate service for FeatureLayer

KlimChugunkin — Thu, 01 Nov 2012 17:46:37 GMT

Just make any kind of request to the service and handle the response or (importantly in your case!) the error.

Thanks you geos_rfleet.

Re: Validate service for FeatureLayer

KlimChugunkin — Thu, 01 Nov 2012 17:47:55 GMT

Like Rich states, maybe you can attempt to access the service before really needing it. Perhaps you can alter the code snippit found in the API documentation for ESRI.Request to verify that the service is up and running: esri.request

Thank you evtguy.
That's what I needed.