topic Re: Adding Individual Feature Layers to the Flex Viewer in ArcGIS Viewer for Flex Questions

Adding Individual Feature Layers to the Flex Viewer

AmySmith1 — Tue, 08 Mar 2011 17:22:47 GMT

Hello!

I'm in the process of learning how to use the ArcGIS Viewer for Flex. I have a basic question you seasoned Flex Viewer / API folks will more than likely be able to answer!

I'd like to add a layer from a map service to my map, using the type = "feature" attribute and feature layer url in the config.xml document. I noticed that when I do this, as opposed to adding the service to which it belongs (using type="dynamic"), it doesn't display on my map. I'm guessing this has something to do with the fact that the symbology is contained in the service and not the individual layers. Am I on the right track? How can I add individual layers and make them visible on my Flex Viewer map?

Any advice would be greatly appreciated. Thanks!

-Amy Smith

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Tue, 08 Mar 2011 17:45:32 GMT

To add a feature layer, you need to specify a particular layer, rather than the whole service. For example:
http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/FeatureServer/2

as opposed to a dynamic map service which would work with:
http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/MapServer

Note that the feature service specifies a layer with a number at the end of the URL. From the service's FeatureServer page in REST, click the layer you want to get the new URL to use.

Re: Adding Individual Feature Layers to the Flex Viewer

PaulLang — Tue, 08 Mar 2011 18:34:22 GMT

Within a Flex APP. Building a definition Expression and tying it together is no big deal. I would like to do this in the Flex Viewer. How do I send this to a featurelayer within the Config.xml?

Re: Adding Individual Feature Layers to the Flex Viewer

AmySmith1 — Tue, 08 Mar 2011 18:43:56 GMT

To add a feature layer, you need to specify a particular layer, rather than the whole service. For example:
http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/FeatureServer/2

as opposed to a dynamic map service which would work with:
http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/MapServer

Note that the feature service specifies a layer with a number at the end of the URL. From the service's FeatureServer page in REST, click the layer you want to get the new URL to use.

Thanks! I was indeed specifying the particular layer, but I didn't realize there was a different service type for individual features within a map service. I'm unfamiliar with feature services (I'm assuming that's what they're called). When I click on the layer I want, the URL still indicates "MapServer", as opposed to "FeatureServer". Is there a particular process I need to go through to create feature services?

-Amy Smith

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Tue, 08 Mar 2011 18:48:58 GMT

Within a Flex APP. Building a definition Expression and tying it together is no big deal. I would like to do this in the Flex Viewer. How do I send this to a featurelayer within the Config.xml?

You can either:
Use the QueryWidget (http://help.arcgis.com/en/webapps/flexviewer/help/widgets/query_widget.htm) and use the preload="open" tag to show a subset of a map service when the map loads, rather than just adding it as an operational layer.

Or, if using a feature layer, use the definitionexpression attribute as specified here:
http://help.arcgis.com/en/webapps/flexviewer/help/layer_tag.htm

Thanks! I was indeed specifying the particular layer, but I didn't realize there was a different service type for individual features within a map service. I'm unfamiliar with feature services (I'm assuming that's what they're called). When I click on the layer I want, the URL still indicates "MapServer", as opposed to "FeatureServer". Is there a particular process I need to go through to create feature services?

Just go to your REST home page (e.g. http://yourserver.com/yourinstance/rest/services/), and you will see that each map service with Feature capability enabled has two entries, one Map Server entry and another Feature Server entry (and a third if Mobile is enabled). Click on the Feature Server link, then the layer you want. Or you can just manually change the URL, but it's always a good idea to click through via your REST page to make sure the service has been created correctly, is started, etc.

Re: Adding Individual Feature Layers to the Flex Viewer

AmySmith1 — Tue, 08 Mar 2011 19:11:39 GMT

Just go to your REST home page (e.g. http://yourserver.com/yourinstance/rest/services/), and you will see that each map service with Feature capability enabled has two entries, one Map Server entry and another Feature Server entry (and a third if Mobile is enabled). Click on the Feature Server link, then the layer you want. Or you can just manually change the URL, but it's always a good idea to click through via your REST page to make sure the service has been created correctly, is started, etc.

I created a new map service with WFS enabled, but I am still only seeing one service (a map service) listed on my REST page. I'm currently using ArcGIS Server 9.3. Is this something that's only available with ArcGIS Server 10?

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Tue, 08 Mar 2011 19:16:25 GMT

I created a new map service with WFS enabled, but I am still only seeing one service (a map service) listed on my REST page. I'm currently using ArcGIS Server 9.3. Is this something that's only available with ArcGIS Server 10?

Yes, "feature services" are different from WFS, and are only supported with Server 10. Just set the type to "dynamic" and you can use your http://yourserver.com/yourinstance/rest/services/yourservice/MapServer/ link. I thought you needed the specific feature service functionality, but if not just use dynamic and you'll be fine.

Re: Adding Individual Feature Layers to the Flex Viewer

AmySmith1 — Tue, 08 Mar 2011 19:27:47 GMT

Yes, "feature services" are different from WFS, and are only supported with Server 10. Just set the type to "dynamic" and you can use your http://yourserver.com/yourinstance/rest/services/yourservice/MapServer/ link. I thought you needed the specific feature service functionality, but if not just use dynamic and you'll be fine.

I must be having some other issue. 😞 Even using the http://yourserver.com/yourinstance/rest/services/yourservice/MapServer/0 url, the feature layer is not viewable when added to the list of operational layers. It shows up under the "More" menu, however when checked on, the layer doesn't appear to be added.

Thanks for the advice on Feature Services. It's definitely something I'm going to look into once my office updates to ArcGIS Server 10.

-Amy Smith

Re: Adding Individual Feature Layers to the Flex Viewer

ChrisBrannin — Wed, 09 Mar 2011 14:31:54 GMT

@jrfishe1
So the only way to get the attribute data from the layers is to use ArcSDE?

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Wed, 09 Mar 2011 14:35:43 GMT

@jrfishe1
So the only way to get the attribute data from the layers is to use ArcSDE?

No, you can still use the Query operation on a map service to get attribute information regardless of whether it's based on SDE or local data on the server. But there is not an easy way to open the full attribute table of a layer in a regular map service.

Re: Adding Individual Feature Layers to the Flex Viewer

ChrisBrannin — Wed, 09 Mar 2011 15:34:40 GMT

Oh yes, but without using a widget and to be able to just click on the features to pull the attributes, then they must be ArcSDE?

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Wed, 09 Mar 2011 15:46:12 GMT

Oh yes, but without using a widget and to be able to just click on the features to pull the attributes, then they must be ArcSDE?

Assuming you mean clicking on a feature in the Flex Viewer and have the simple info window pop up, that does require a feature service but I don't think you need to base that service on data in SDE.

Re: Adding Individual Feature Layers to the Flex Viewer

ChrisBrannin — Wed, 09 Mar 2011 15:51:31 GMT

Actually I am seeing this now. So I have to publish my MXD with feature access and then write the code as type="feature" and myserver/***/featureservice/(layer#)

I am seeing a strange error though when I try and upload to my server:

Service was published but cannot be started due to: Configuration Campus_assets_cartlab.MapServer can not be started.
Server Object instance creation failed on machine gis.

any thoughts?

Re: Adding Individual Feature Layers to the Flex Viewer

JonFisher — Wed, 09 Mar 2011 16:28:50 GMT

Actually I am seeing this now. So I have to publish my MXD with feature access and then write the code as type="feature" and myserver/***/featureservice/(layer#)

I am seeing a strange error though when I try and upload to my server:

Service was published but cannot be started due to: Configuration Campus_assets_cartlab.MapServer can not be started.
Server Object instance creation failed on machine gis.

any thoughts?

One possible cause of this error seems to be having a map extent that goes off the edges of the earth. I've noticed that if I set my data frame properties to fixed extent, and make sure that none of the four extent values is too high or low. For example, if your map service is in Web Mercator, make sure that the left and bottom are no less than -20,037,507.0671618 m, and the top and right are no more than 20,037,507.0671618 m. For geographic it would be y between 90 and -90 and x between -180 and 180. Also set the extent used by full extent command to be the same.

See if that helps? I've had that not very specific or helpful error many times, and the above often seems to fix it. I'd love to know some other possible fixes though.

Re: Adding Individual Feature Layers to the Flex Viewer

NathanEnge — Wed, 09 Mar 2011 17:53:21 GMT

Actually I am seeing this now. So I have to publish my MXD with feature access and then write the code as type="feature" and myserver/***/featureservice/(layer#)

I am seeing a strange error though when I try and upload to my server:

Service was published but cannot be started due to: Configuration Campus_assets_cartlab.MapServer can not be started.
Server Object instance creation failed on machine gis.

any thoughts?

Take a look at the config logs. I suspect you may be seeing something like this in there:

Layer: XXXXXXXXXX does not use SDE GeoDatabase. Feature Access capabilty requires the data to be on SDE GeoDatabase.

Re: Adding Individual Feature Layers to the Flex Viewer

ChrisBrannin — Wed, 09 Mar 2011 19:14:39 GMT

I did not check the logs (duh) but I did place all my feature classes into the SDE and now it uploaded like a charm. So yes loading these onto the SDE was the ticket. Thanks for all the help!

Cheers
Chris