topic Re: Operational Layers Not Displaying in ArcGIS API for Flex Questions

Operational Layers Not Displaying

EmilyLaMunyon — Fri, 24 Sep 2010 18:00:12 GMT

Hello,

I downloaded the ArcGIS Viewer for Flex 2.1 and have it up and running. However, I am unable to display layers/services from our ArcGIS Server 9.3. The label shows up under the More tab, just not on the map. In the config.xml I added this code:

<operationallayers>

<layer label="SLCo" type="dynamic" visible="false"
url="http://slcarcgisdev:8399/arcgis/rest/services/Utah_Trails/Polygons2/MapServer"/>
</operationallayers>

I have a feeling it is a projection issue (my data is in State Plane Feet) , however, I have been reading that this application should re-project layers on the fly if they are dynamic. Any help would be greatly appreciated.

Thanks!

Re: Operational Layers Not Displaying

RobertScheitlin__GISP — Fri, 24 Sep 2010 18:13:45 GMT

Emily,

If your ArcGIS Server and web server are on two different machines than yyou need a crossdomain.xml on your ArcGIS Servers web root.

More info here:

http://help.arcgis.com/en/webapi/flex/help/content/deploy_application.htm

Re: Operational Layers Not Displaying

EmilyLaMunyon — Fri, 24 Sep 2010 19:19:57 GMT

Emily,

If your ArcGIS Server and web server are on two different machines than yyou need a crossdomain.xml on your ArcGIS Servers web root.

More info here:

http://help.arcgis.com/en/webapi/flex/help/content/deploy_application.htm

Thanks Robert! I had read that somewhere and put the crossdomain.xml in the root on my machine (localhost), but you are saying that it needs to reside on the server itself? I will give that a try and see if it works.

Re: Operational Layers Not Displaying

EmilyLaMunyon — Mon, 27 Sep 2010 13:03:13 GMT

Hi Robert,

I put the crossdomain.xml at the server root and still no luck. I am wondering if it has something to do with the services on our 9.3 server. I was able to get our layers to appear with the old 1.3 sample viewer, just no luck with the new one (2.1). Do the layers have to be set-up as dynamic if they are in a different projection than the map? Are there differences between the 1.3 and 2.1 that I am missing?

Thanks!

Re: Operational Layers Not Displaying

RobertScheitlin__GISP — Mon, 27 Sep 2010 13:20:26 GMT

Emily,

Yes if your mapservices are in a different projection than the map they have to be dynamic. The quality and responsiveness of a map that has multiple map services that require re-projection is going to be pretty slow. It is always best to reproject your data to be in the same WKID as the base maps you are using. There are some changes to the 2.1 Flexviewer that could be affecting you. Maybe you should post your config.xml.

Re: Operational Layers Not Displaying

EmilyLaMunyon — Mon, 27 Sep 2010 14:02:01 GMT

Here is my config.xml.

Thanks again!

<?xml version="1.0" ?>

<configuration>
    <title>Salt Lake County Surveyor's Office</title>
    <subtitle>Interactive GIS Map</subtitle>
    <logo>assets/images/logo.png</logo>
    <stylecolors>0xFFFFFF,0x963524,0x101010,0x00789,0xFFD700</stylecolors> 
    <stylealpha>0.8</stylealpha>

    
    <widget left="10" top="50"    config="widgets/Navigation/NavigationWidget.xml" url="widgets/Navigation/NavigationWidget.swf"/>
    <widget right="-2" bottom="-2" config="widgets/OverviewMap/OverviewMapWidget.xml" url="widgets/OverviewMap/OverviewMapWidget.swf"/>
    <widget right="20" top="55"    config="widgets/MapSwitcher/MapSwitcherWidget.xml" url="widgets/MapSwitcher/MapSwitcherWidget.swf"/>
    <widget left="0"   top="0"     config="widgets/HeaderController/HeaderControllerWidget.xml" url="widgets/HeaderController/HeaderControllerWidget.swf"/>

   <map initialextent="-12535000 4932500 -12367000 4992700" top="40">
        <basemaps>
            <layer label="Streets" type="tiled" visible="true" alpha="1"
                       url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
     <layer label="Aerial" type="tiled" visible="false" alpha="1"
                        url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"/>
            <layer label="Topo"    type="tiled" visible="false" alpha="1"
                        url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/>
        </basemaps>

         <operationallayers>

            <layer label="Boundaries and Places" type="dynamic" visible="false" alpha="1"
                   url="http://gis.slco.org/wwwrest/services/Utah_Trails/AttractorsMapTips/MapServer"/>

        </operationallayers>

</map>

    
    
    <widgetcontainer layout="float">
        <widget label="Bookmarks"         left="430" top="90"
                icon="assets/images/i_bookmark.png"
                config="widgets/Bookmark/BookmarkWidget.xml"
                url="widgets/Bookmark/BookmarkWidget.swf"/>
        <widget label="Find an address"   left="100" top="90" preload="open"
                icon="assets/images/i_target.png"
                config="widgets/Locate/LocateWidget_US.xml"
                url="widgets/Locate/LocateWidget.swf"/>

        <widget label="Search" left="80" top="280"
                icon="assets/images/i_search.png"
                config="widgets/Search/SearchWidget_Louisville.xml"
                url="widgets/Search/SearchWidget.swf"/>
        <widget label="Earthquakes (GeoRSS)" left="410" top="280"
                icon="assets/images/i_rss.png"
                config="widgets/GeoRSS/GeoRSSWidget.xml"
                url="widgets/GeoRSS/GeoRSSWidget.swf"/>
        <widget label="Draw and Measure" left="60" top="400"
                icon="assets/images/i_draw2.png"
                config="widgets/Draw/DrawWidget.xml"
                url="widgets/Draw/DrawWidget.swf"/>
        <widget label="Print" left="390" top="400"
                icon="assets/images/i_print.png"
                config="widgets/Print/PrintWidget.xml"
                url="widgets/Print/PrintWidget.swf"/>

        
    </widgetcontainer>

</configuration>

Re: Operational Layers Not Displaying

RobertScheitlin__GISP — Mon, 27 Sep 2010 14:19:18 GMT

Emily,

I still don't see a crossdomain on this server...
http://gis.slco.org/crossdomain.xml

But using the Flash Builder debugger I was able to load your config.xml and it worked fine. You do not have anything from your map service displayed even once you check the map service as visible due to scale dependencies that you have set but once I zoom in once it displays fine.

Re: Operational Layers Not Displaying

EmilyLaMunyon — Mon, 27 Sep 2010 17:00:48 GMT

Thanks so much for your help! We finally got it working, it was a reverse proxy issue.

Re: Operational Layers Not Displaying

JimBurd — Mon, 27 Sep 2010 20:03:57 GMT

Emily,

Hi, would you describe your reverse proxy issue and solution? I think I am having the same problem.

Thank you,
Jim Burd

Re: Operational Layers Not Displaying

EmilyLaMunyon — Mon, 27 Sep 2010 21:29:41 GMT

Hi Jim,

My IS department actually figured out the reverse proxy issue, and I asked them to explain it better than I could.

Hi Emily,

I would say it like this�?�

The front end server in our reverse proxy configuration needed to have a directive set up to forward any requests to http://frontend/crossdomain.xml would be redirected to the backend server url�?�http://backend/crossdomain.xml. Originally http://frontend/crossdomain.xml wasn�??t resolving to anything because this file isn�??t located on this server, but on the back end server. Help with the apache directives for the reverse proxy redirect (ProxyPassMatch & ProxyPassReverse) be found here�?�
http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#proxypassmatch
�?��?�

I know this still seems confusing, not sure how to simplify the explanation.

Hope this helps!

Re: Operational Layers Not Displaying

JimBurd — Tue, 28 Sep 2010 16:53:33 GMT

Emily,

Thank you. I've passed this information on to my IT support.

Jim Burd

Re: Operational Layers Not Displaying

giuseppemolinario — Thu, 14 Oct 2010 01:41:45 GMT

Hi Emily, Jim and all,

I am having the same issue. I think I have tried everything except doing the arcgis server dance and hope that works.

Now, this reverse proxy issue. Does it mean that the crossdomain.xml file needs to be put in the web server where the flex application is (in my case IIS) and ALSO somewhere else?

I am running arcgis server 9.3.1 on a single machine (both som and soc) and my rest api works (checked by going to its url) and my map services work as well (checked on manager and also by going to their rest url's).

Whenever i make changes to the flex application's config.xml I see the changes in the interface (i see my oprational layer under "more") but I never, ever, ever see the actual data on the map.

This was meant to be the easy step - what else do I do or try? what is this reverse proxy thing? is that what I need to worry about ?

Thanks

Giuseppe