topic Re: Legend Widget with ArcGISTiledMapServiceLayer in ArcGIS JavaScript Maps SDK Questions

Legend Widget with ArcGISTiledMapServiceLayer

markpenton1 — Wed, 24 Oct 2018 17:07:03 GMT

In regards to displaying a ArcGISTiledMapServiceLayer in a legend widget with the JavaScript 3.26 API (see code and layer below). The legend is displaying the layer's symbology, but it is simultaneously displaying a set of symbology, one for each scale cached into the service layer. The results of which is that I see (the same) symbology in the legend for all scales. I am only interested in the legend displaying the correct symbols based on the map's current display scale. Any way to javascript code my way around this? BTW- I am not the owner of this layer.

basemaplayerStreet = new esri.layers.ArcGISTiledMapServiceLayer("http://maps.cityofmobile.org/ArcGIS/rest/services/Base_Cache/MapServer",
{id: 'City Base'});

map.on("layers-add-result", function (results)
{

var legendDijit = new Legend
({map: map,}, "legendDiv");

legendDijit.startup();

}); /*end layers-add-result*/

map.addLayer(basemaplayerStreet);

Re: Legend Widget with ArcGISTiledMapServiceLayer

RobertScheitlin__GISP — Wed, 24 Oct 2018 20:32:18 GMT

Mark,

Because ArcGISTiledMapServiceLayer just returns cached tiles from the server you have no control over what layer are displayed. You would have to switch to a ArcGISDynamicMapServiceLayer and it will only show the layers based on their visible scale.

Re: Legend Widget with ArcGISTiledMapServiceLayer

markpenton1 — Thu, 25 Oct 2018 02:53:16 GMT

Robert,

Thanks and that was what I was thinking. Guess the alternative is a fixed image representing a legend inside of a dojo ‘contentpane’.

Re: Legend Widget with ArcGISTiledMapServiceLayer

RobertScheitlin__GISP — Thu, 25 Oct 2018 12:37:20 GMT

Mark,

Yep that is a good option. Don't forget to mark this question as answered by clicking on the "Mark Correct" link on the reply that answered your question.