topic Re: checking if a service is availible in ArcGIS JavaScript Maps SDK Questions

checking if a service is availible

GavinTrowles — Mon, 25 Oct 2010 13:47:20 GMT

Hi

Is there anyway to detect if a service is available to avoid having the map wait for a service that may never respond. On occasion the service that my code points to has been known to not respond to my request and in these instances I would like to report this issue to the user.

Thanks

Re: checking if a service is availible

RichardWatson — Wed, 29 Dec 2010 14:44:32 GMT

Perhaps you could develop a web service which uses the SOM in order to ascertain information with regards to the services?

Re: checking if a service is availible

HemingZhu — Wed, 29 Dec 2010 16:33:05 GMT

Hi

Is there anyway to detect if a service is available to avoid having the map wait for a service that may never respond. On occasion the service that my code points to has been known to not respond to my request and in these instances I would like to report this issue to the user.

Thanks

Have you tried to use onLayerAddResult(layer, error). by testing if error ==null, you will know if the layer add successfully.

Re: checking if a service is availible

ScottMoore__Olympia_ — Wed, 29 Dec 2010 17:19:46 GMT

Here is a sample I threw together to test whether or not a dynamic map service was available or not. You should use the Firebug console or something like that to see what is happening. This checks to see if the layer has loaded with triggers to let a user know that the layer is taking time to load. Also, it will detect if the layer has loaded and there are intermittent problems with the layer getting images from the server. Hope this helps.

http://nwdemo1.esri.com/js/various/testLayerLoad2.htm

Re: checking if a service is availible

RichardWatson — Wed, 29 Dec 2010 18:33:39 GMT

We use SilverLight and what we do is as follows:

1) For layers we use that are required, i.e. the application will not function without it, we add an attached property to the XAML that indicates that the layer is required
2) In the application unhandled exception handler, we check to see if the exception is related to a layer load issue
3) If the exception relates to a layer load issue and the layer is required then we fail the application and inform the user
4) If the exception relates to a layer load issue and the layer is not required then we eat the exception and simply log the error