topic Re: How do you get renderer from a feature layer? in ArcGIS JavaScript Maps SDK Questions

How do you get renderer from a feature layer?

MorganEverett — Wed, 11 Mar 2015 22:35:39 GMT

How do you get the renderer from a feature layer?

I want to get the current rendered from a feature layer, and then set the RotationInfo on it so I can rotate my graphics that are in that feature service.

Re: How do you get renderer from a feature layer?

SteveCole — Wed, 11 Mar 2015 23:06:13 GMT

The renderer is a property of the featureLayer so:

var theRenderer = theLayer.renderer;

Re: How do you get renderer from a feature layer?

MorganEverett — Wed, 11 Mar 2015 23:57:37 GMT

I've tried that, it is null every time. Or am I looking at it at the wrong time?

Re: How do you get renderer from a feature layer?

KenBuja — Thu, 12 Mar 2015 01:53:43 GMT

When are you trying to get the renderer? You're probably trying to access it before it's ready. Try setting that after the FeatureLayer's load event fires.

Re: How do you get renderer from a feature layer?

RobertScheitlin__GISP — Sat, 11 Dec 2021 14:48:43 GMT

Morgan,

Here is a simple sample.

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Feature Layer Only Map</title>
    <link rel="stylesheet" href="http://js.arcgis.com/3.13/esri/css/esri.css">
    <style>
      html, body, #map {
        height: 100%;
        width: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script src="http://js.arcgis.com/3.13/"></script>
    <script>
      require([
        "dojo/dom-construct",
        "esri/map",
        "esri/layers/FeatureLayer",
        "esri/geometry/Extent",
        "esri/InfoTemplate",
        "dojo/domReady!"
      ], function(
          domConstruct,
          Map,
          FeatureLayer,
          Extent,
          InfoTemplate
        ) {
          var bounds = new Extent({
            "xmin":-16045622,
            "ymin":-811556,
            "xmax":7297718,
            "ymax":11142818,
            "spatialReference":{"wkid":102100}
          });

          var map = new Map("map", {
            extent: bounds
          });

          var url = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/WorldTimeZones/MapServer/2";

          var template = new InfoTemplate("World Regions", "Region: ${REGION}");

          var fl = new FeatureLayer(url, {
            id: "world-regions",
            infoTemplate: template
          });
          fl.on('load', function(evt){
            console.info(evt.target.renderer);
          });

          map.addLayer(fl);
        }
      );
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

Re: How do you get renderer from a feature layer?

MorganEverett — Thu, 12 Mar 2015 03:48:08 GMT

Robert, that worked perfectly.

Thanks.

Re: How do you get renderer from a feature layer?

deleted-user-wcpelUUf_XXx — Sun, 30 Aug 2020 07:54:03 GMT

Robert,

does this solution works only with simple symbology?

I tried this with my current code and it returned the same result i have here:

renderer from an existing service fails to return the full symbology

with the symbology as you can see in the pictures not fully operational when its "complicated".

any ideas?

Re: How do you get renderer from a feature layer?

RobertScheitlin__GISP — Sun, 30 Aug 2020 20:14:58 GMT

No it should work with any renderer.

Re: How do you get renderer from a feature layer?

deleted-user-wcpelUUf_XXx — Sat, 11 Dec 2021 14:48:46 GMT

im trying to do the same with a uniqeValue renderer from a public service, and the code seems to get me the renderer and the attribute field, but on rendering i get a bad result.

this is the code:

		  var serviceUrl = "https://ags.iplan.gov.il/arcgisiplan/rest/services/PlanningPublic/Xplan_2039/MapServer/1";
		  var layer = new FeatureLayer(serviceUrl);
 
          if (featureLayer.graphics) { 
			layer.on('load', function(evt){  
            console.info(evt.target.renderer);
			featureLayer.setRenderer(evt.target.renderer)
          }); 
‍‍‍‍‍‍‍‍

it gets me:

instead of:im trying to get why the original service im taking the renderer from has a different symbology than mine,

from service:

from the code:

Re: How do you get renderer from a feature layer?

RobertScheitlin__GISP — Mon, 31 Aug 2020 11:30:23 GMT

Segev,

There is some hatching symbology that is not supported on ArcGIS server services and normally you are warned of this when you publish the service.

Re: How do you get renderer from a feature layer?

deleted-user-wcpelUUf_XXx — Mon, 31 Aug 2020 12:30:02 GMT

Robert,

the original service is not mine, its already up and working on the web with all the symbology present, there is nothing im trying to use that is not already working on the service as it is.

this is the service on a webapp with the symbology working perfectly, using this supported and already published service in the code to extract renderer still results in bad partial symbology when i try and replicate it.

how can i extract the already working renderer to my layer without losing the data?

Re: How do you get renderer from a feature layer?

RobertScheitlin__GISP — Mon, 31 Aug 2020 12:38:40 GMT

Segev,

Most likely the difference you are seeing there is that the layer is being rendered server side (using ArcObject) verses you attempting to render clientside using the JS API (i.e. a ArcGISDynamicMapServiceLayer vs. FeatureLayer). To see this add the url as ArcGISDynamicMapServiceLayer in your app and you will see all the symbology just fine.

Re: How do you get renderer from a feature layer?

deleted-user-wcpelUUf_XXx — Sat, 11 Dec 2021 14:48:49 GMT

is this what you meant?

i also added the requirements but the console.info\renderer returns as undefined.

var serviceUrl = "https://ags.iplan.gov.il/arcgisiplan/rest/services/PlanningPublic/Xplan_2039/MapServer/1";
var layer = new ArcGISDynamicMapServiceLayer(serviceUrl);

if (featureLayer.graphics) { 
layer.on('load', function(evt){ 
console.info(evt.target.renderer);
featureLayer.setRenderer(evt.target.renderer)
});‍‍‍‍‍‍‍‍

Re: How do you get renderer from a feature layer?

RobertScheitlin__GISP — Mon, 31 Aug 2020 13:33:04 GMT

No, not at all. What I am saying is that when you add a ArcGISDynamicMapServiceLayer to a map that the rendering is done on the server and an image (not clientside graphics) is returned to the JS API. Thus the server has no issue drawing these complex composite fills. A FeatureLayer is drawn clientside and use the JS API for all it's rendering and thus is limited in several ways that the server is not. You code above is still trying to apply the renderer to a FeatureLayer and you will continue to have the same issue as before.