Layer confusion

Permanently deleted user

December 22, 2010 20:14

Hello everyone. What I want to be able to do, is get a list of all Layers within a Mapservice from an Essentials site and present them to the user with checkbox so the user can switch layers on and off. This is easy to do with the ESRI API but i'm having trouble using the Essentials API. I have the following code in an application and it doesn't work. It keeps turning *all* the layers in the map service on. Further more, it doesn't switch the layer(s) off. Can anyone explain why? var layer = essentials.site.essentialsMap.mapServices[serviceId].layers[layerId]; layer.setVisibility(isVisible); where essentials is an object which holds a reference to all global variables within the page. Also, if anyone has any advice or thoughts that would be great. Many thanks, David. Example: http://geoserver.nottinghamcity.gov.uk/dev/testing/essentials2.htm (if you view the source, the code above is in a function at line 298).

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  Permanently deleted user

  December 07, 2011 03:31

  David,

  Were you able to get to work?

  I'd like to add some of the same type of functionality to my map.

  Thanks,

  Tyler

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  Permanently deleted user

  December 08, 2011 21:20

  Hello Tyler,

  David and I actually worked around this... by not using the essentials layer object at all. We don't fully initialise the essentials services and layers, because this causes its own set of peculiar behaviours; we're controlling the visibility by accessing the esri service layer directly. We're using a couple of arrays stored in globals.visible[sid][] to control visibility:

  var esService = essentials.site.essentialsMap.mapServices[serviceId];

   

  var esriServiceLayer = esService.serviceLayer;

   

   

   

  if (globals.visible[serviceId].length === 0){

   

     esriServiceLayer.hide();

   

     esriServiceLayer.setVisibleLayers([-1]);

   

     esService.setVisibility(false);

   

  }else{

   

     isWorking(true);

   

     esriServiceLayer.setVisibleLayers(globals.visible[serviceId]);   

   

     esriServiceLayer.show();

   

     esService.setVisibility(true);

   

  }

  This works perfectly well with the essentials print engine at version 3.4.1, ArcGIS API v2.1. We've not tried 3.5.1 yet, but 3.5 broke printing for us, and AGS API >2.1 breaks *everything*.

  It's currently powering the site at: http://info.nottinghamcity.gov.uk/insightmapping/

  - Ben

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  Permanently deleted user

  December 09, 2011 03:59

  Ben,

  Great mapping site. http://info.nottinghamcity.gov.uk/insightmapping/

  Thanks for the coding tip.

  I was running into some of the same issues when initializing the essentials layers.

  I really wished that GeoCortex had some coding examples on the resources.geocortex JS API site for best practices when creating legends, layer lists with check boxes/ radio buttons, etc.  And not have to worry about “work-arounds” not working, or breaking things at the next API version release.

  Thanks again for your help.

  Tyler

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