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                <div id="viewDiv"></div>



#viewDiv {
  padding: 0;
  margin: 0;
  height: 100%;
  width: 100%;


                // Shows how to do proper "show popup on hover" using 
// debouncing so that there's no flickering/stuttering. 
// Example without debouncing: 
// Example using built-in promiseUtils:
  // see how we're loading Lodash in Dojo AMD by clicking 
  // codepen "settings > HTML > Stuff for <head>":
], function(SceneView, MapView, FeatureLayer, PopupTemplate, _) {
  var fl = new FeatureLayer({
    outFields: ["*"],
    // popup: new Popup(),
    popupEnabled: true,
    popupTemplate: new PopupTemplate({
      title: "{state_name}",
      content: "Population (2000): {pop2000}"
  // fl.popupTemplate = fl.createPopupTemplate();

  var viewOptions = {
    container: "viewDiv",
    map: {
      basemap: "streets-vector",
      layers: [fl]
    center: [-98, 37],
    zoom: 3

  // 2D:
  var view = new MapView(viewOptions);

    _.debounce(event => {
      view.hitTest(event).then(response => {
        if (response.results.length > 0) {
          // check if a feature is returned from the layer we are interested in,
          // and set the graphic to the "view.popup.features"
          const graphicsInOurLayer = response.results.filter(function(result) {
            return result.graphic.layer === fl;
          if(graphicsInOurLayer.length > 0) {
              location: view.toMap({ x: event.x, y: event.y }),
              features:  [graphicsInOurLayer[0].graphic]
          } else {
            view.popup.visible = false;
        } else {
          view.popup.visible = false;
    }, 200)