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HTML 

              
                
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
  <!--
  ArcGIS API for JavaScript, https://js.arcgis.com
  For more information about the sketch-geometries sample, read the original sample description at developers.arcgis.com.
  https://developers.arcgis.com/javascript/latest/sketch-geometries/index.html
  -->
<title>Sketch temporary geometries - 4.5</title>

  <link rel="stylesheet" href="https://js.arcgis.com/4.5/esri/css/main.css">
  <script src="https://js.arcgis.com/4.5/"></script>

  <style>
    html,
    body,
    #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
      font-family: verdana;
    }

    #topbar {
      background: #fff;
      position: absolute;
      top: 15px;
      right: 15px;
      padding: 10px;
    }

    .action-button {
      font-size: 16px;
      background-color: transparent;
      border: 1px solid #D3D3D3;
      color: #6e6e6e;
      height: 32px;
      width: 32px;
      text-align: center;
      box-shadow: 0 0 1px rgba(0, 0, 0, 0.3);
    }

    .action-button:hover,
    .action-button:focus {
      background: #0079c1;
      color: #e4e4e4;
    }

    .active {
      background: #0079c1;
      color: #e4e4e4;
    }
  </style>

  <script>
    require([
      "esri/views/SceneView",
      "esri/WebScene",
      "esri/widgets/Sketch/SketchViewModel",
      "esri/Graphic",
      "esri/geometry/Polyline",
      "dojo/domReady!"
    ], function(
      MapView, WebMap,
      SketchViewModel, Graphic, Polyline
    ) {

      // Arctic Ocean Basemap
      var webmap = new WebMap({
        portalItem: { // autocasts as new PortalItem()
          id: "94e00add11334767afb0abdce49c9a43"
        }
      });

      var view = new MapView({
        container: "viewDiv",
        map: webmap
      });
      
      const sym = { // symbol used for polylines
        type: "simple-line", // autocasts as new SimpleMarkerSymbol()
        color: "#8A2BE2",
        width: "4",
        style: "dash"
      }
      
      let currGraphic;
      let currGeometry;
      view.on('drag', ["Control"], e => {
        e.stopPropagation();
        let p = view.toMap(e);
        if (e.action === "start") {
          if (currGraphic) {
            view.graphics.remove(currGraphic);
          }
          
          currGeometry = new Polyline({
            paths: [
              [p.x, p.y, p.z]
            ],
            spatialReference: { wkid: 102100 }
          });
          
          currGraphic = new Graphic({
            geometry: currGeometry,
            symbol: sym
          });
          
        } else {
          if (currGraphic) {
            view.graphics.remove(currGraphic);
          }
          currGeometry.paths[0].push([p.x, p.y, p.z]);
          currGraphic = new Graphic({
            geometry: currGeometry,
            symbol: sym
          });
          view.graphics.add(currGraphic);
        }
      });
    });
  </script>
</head>

<body>
  <div id="viewDiv">
    <div id="topbar">
      <button class="action-button esri-icon-blank-map-pin" id="pointButton" type="button"
        title="Draw point"></button>
      <button class="action-button esri-icon-polyline" id="polylineButton" type="button"
        title="Draw polyline"></button>
      <button class="action-button esri-icon-polygon" id="polygonButton" type="button"
        title="Draw polygon"></button>
      <button class="action-button esri-icon-trash" id="resetBtn" type="button" title="Clear graphics"></button>
    </div>
  </div>
</body>

</html>
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