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Unique value renderer

Description

This sample uses a unique value renderer to symbolize the United States. Each state has a string attribute "SUB_REGION" indicating its region of the country. The UniqueValueRenderer.addValue() method is used repeatedly to define a color for each region.

Code

<!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>Unique Value Renderer</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.20/esri/css/esri.css">
    <style>
      html, body, #map{
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script src="https://js.arcgis.com/3.20/"></script>
    <script>
      var map;
      require([
        "esri/map", "esri/layers/FeatureLayer", "esri/InfoTemplate",
        "esri/symbols/SimpleLineSymbol", "esri/symbols/SimpleFillSymbol",
        "esri/renderers/UniqueValueRenderer", "esri/Color",
        "dojo/domReady!"
      ], function(
        Map, FeatureLayer, InfoTemplate,
        SimpleLineSymbol, SimpleFillSymbol,
        UniqueValueRenderer, Color
      ) {
        map = new Map("map", {
          basemap: "streets",
          center: [-95.625, 39.243],
          zoom: 4,
          slider: false
        });
        map.on("load", addFeatureLayer);

        function addFeatureLayer() {
          var defaultSymbol = new SimpleFillSymbol().setStyle(SimpleFillSymbol.STYLE_NULL);
          defaultSymbol.outline.setStyle(SimpleLineSymbol.STYLE_NULL);

          //create renderer
          var renderer = new UniqueValueRenderer(defaultSymbol, "SUB_REGION");

          //add symbol for each possible value
          renderer.addValue("Pacific", new SimpleFillSymbol().setColor(new Color([255, 0, 0, 0.5])));
          renderer.addValue("Mtn", new SimpleFillSymbol().setColor(new Color([0, 255, 0, 0.5])));
          renderer.addValue("N Eng", new SimpleFillSymbol().setColor(new Color([0, 0, 255, 0.5])));
          renderer.addValue("S Atl", new SimpleFillSymbol().setColor(new Color([255, 0, 255, 0.5])));
          renderer.addValue("Mid Atl", new SimpleFillSymbol().setColor(new Color([255, 255, 255, 0.75])));
          renderer.addValue("E N Cen", new SimpleFillSymbol().setColor(new Color([0, 255, 255, 0.5])));
          renderer.addValue("W N Cen", new SimpleFillSymbol().setColor(new Color([255, 255, 0, 0.5])));
          renderer.addValue("E S Cen", new SimpleFillSymbol().setColor(new Color([127, 127, 127, 0.5])));
          renderer.addValue("W S Cen", new SimpleFillSymbol().setColor(new Color([0, 0, 0, 0.5])));
          
          var featureLayer = new FeatureLayer("https://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer/1", {
            infoTemplate: new InfoTemplate(" ", "${SUB_REGION}"),
            mode: FeatureLayer.MODE_ONDEMAND,
            outFields: ["SUB_REGION"]
          });
          
          featureLayer.setRenderer(renderer);
          map.addLayer(featureLayer);
        }
      });
    </script>
  </head>
  
  <body>
    <div id="map"></div>
  </body>

</html>