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HTML 

              
                <link rel="stylesheet" href="https://js.arcgis.com/4.28/esri/themes/light/main.css">

<script src="https://js.arcgis.com/4.28/"></script>

<script type="module" src="https://js.arcgis.com/calcite-components/1.11.0/calcite.esm.js"></script>

<link rel="stylesheet" type="text/css" href="https://js.arcgis.com/calcite-components/1.11.0/calcite.css" />

<calcite-shell>

  <div id="SpeciesMap" />
  <calcite-shell-panel slot="panel-start" position="start" width-scale="l">
    <div id="ShowLayersDiv" />
  </calcite-shell-panel>

</calcite-shell>
!

CSS 

              
                #SpeciesMap {
  flex: 1;
}
!

JS 

              
                require([
  "esri/Map",
  "esri/views/MapView",
  "esri/Graphic",
  "esri/layers/FeatureLayer",
  "esri/widgets/LayerList",
  "esri/widgets/ScaleBar",
  "esri/widgets/Locate",
  "esri/widgets/BasemapToggle"
], function (
  Map,
  MapView,
  Graphic,
  FeatureLayer,
  LayerList,
  ScaleBar,
  Locate,
  BasemapToggle
) {
  // var sightings = <?php echo json_encode($coords) ?>;
  // var	speciesName = <?php echo json_encode($thisTaxon) ?>;
  // var	commonName = <?php echo json_encode($evernacular) ?>;
  const sightings = [
    {
      MapAlt: "757",
      MapDate: "2021-05-08",
      MapFullName: "xxxxxx",
      MapID: "249",
      MapLat: "39.748225",
      MapLocation: "Mt. Pandokrator",
      MapLong: "19.855923",
      MapQty: "1",
      Stage: "P",
      stageQty: null
    },
    {
      MapAlt: "757",
      MapDate: "2021-05-08",
      MapFullName: "xxxxxx",
      MapID: "250",
      MapLat: "39.8",
      MapLocation: "Mt. Pandokrator",
      MapLong: "19.9",
      MapQty: "1",
      Stage: "A",
      stageQty: null
    },
    {
      MapAlt: "757",
      MapDate: "2021-05-08",
      MapFullName: "xxxxxx",
      MapID: "250",
      MapLat: "39.9",
      MapLocation: "Mt. Pandokrator",
      MapLong: "19.8",
      MapQty: "1",
      Stage: "L",
      stageQty: null
    }
  ];
  const speciesName = "species name";
  const commonName = "common name";
  const stageLetters = "AEWLP";
  const stageText = ["Adult", "Egg", "Larval Web", "Larva", "Pupa"];
  const stagePlurals = ["Adults", "Eggs", "Larval Webs", "Larvae", "Pupae"];
  const stageColours = ["Green", "Yellow", "Orange", "Blue", "Red"];
  const map = new Map({
    basemap: "topo-vector"
  });
  var view = new MapView({
    container: "SpeciesMap",
    map: map,
    center: [19.870373, 39.589907],
    zoom: 10
  });
  var scaleBar = new ScaleBar({
    view: view,
    style: "ruler",
    unit: "metric"
  });
  view.ui.add(scaleBar, {
    position: "bottom-right"
  });
  var basemapToggle = new BasemapToggle({
    view: view,
    nextBasemap: "satellite"
  });
  view.ui.add(basemapToggle, "bottom-left");
  let fields = [
    {
      name: "MapID",
      type: "oid"
    },
    {
      name: "MapDate",
      type: "string"
    },
    {
      name: "CommName",
      type: "string"
    },
    {
      name: "SpName",
      type: "string"
    },
    {
      name: "MapFullName",
      type: "string"
    },
    {
      name: "MapLocation",
      type: "string"
    },
    {
      name: "MapAlt",
      type: "integer"
    },
    {
      name: "MapQty",
      type: "integer"
    },
    {
      name: "Stage",
      type: "string"
    }
  ];
  // client side feature layer using the adult graphics as the source
  const adultFeatureLayer = new FeatureLayer({
    geometryType: "point",
    spatialReference: { wkid: 4326 },
    source: [],
    objectIdField: "MapID",
    fields: fields,
    title: "Adults",
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        size: 9,
        color: "green"
      }
    }
  });
  const eggFeatureLayer = new FeatureLayer({
    geometryType: "point",
    spatialReference: { wkid: 4326 },
    source: [],
    objectIdField: "MapID",
    fields: fields,
    title: "Eggs",
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        size: 9,
        color: "yellow"
      }
    }
  });
  const webFeatureLayer = new FeatureLayer({
    geometryType: "point",
    spatialReference: { wkid: 4326 },
    source: [],
    objectIdField: "MapID",
    fields: fields,
    title: "Larval webs",
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        size: 9,
        color: "orange"
      }
    }
  });
  const larvaFeatureLayer = new FeatureLayer({
    geometryType: "point",
    spatialReference: { wkid: 4326 },
    source: [],
    objectIdField: "MapID",
    fields: fields,
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        size: 9,
        color: "blue"
      }
    },
    title: "Larvae"
  });
  const pupaFeatureLayer = new FeatureLayer({
    geometryType: "point",
    spatialReference: { wkid: 4326 },
    source: [],
    objectIdField: "MapID",
    fields: fields,
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        size: 9,
        color: "red"
      }
    },
    title: "Pupae"
  });
  map.addMany([
    pupaFeatureLayer,
    larvaFeatureLayer,
    webFeatureLayer,
    eggFeatureLayer,
    adultFeatureLayer
  ]);
  var someAdults = false;
  var someEggs = false;
  var someWebs = false;
  var someLarvae = false;
  var somePupae = false;
  sightings.forEach((coords) => {
    // var MapQty = parseInt(coords.MapQty);
    // var MapAlt = parseInt(coords.MapAlt);
    // // var stageLetter = "A";
    // if (coords.MapQty > 0) {
    //   var MapQty = parseInt(coords.MapQty);
    //   var stageLetter = coords.Stage;
    // }
    // let stagePos = stageLetters.indexOf(stageLetter);
    // if (MapQty > 1) {
    //   var stageName = stagePlurals[stagePos];
    // } else {
    //   var stageName = stageText[stagePos];
    // }
    // let stageColour = stageColours[stagePos];
    const graphic = new Graphic({
      geometry: {
        type: "point",
        longitude: coords.MapLong,
        latitude: coords.MapLat
      },
      attributes: {
        MapID: coords.MapID,
        MapDate: coords.MapDate,
        // CommName: commonName,
        // SpName: speciesName,
        MapFullName: coords.MapFullName,
        MapLoc: coords.MapLocation,
        MapAlt: coords.MapAlt,
        MapQuantity: coords.MapQty,
        MapStageName: coords.Stage
      }
    });
    const popupTemplate = {
      title: "{CommName} (<i>{SpName}</i>)",
      content:
        "Record ID: <b>{MapID}</b><br>Recorded on <b>{MapDate}</b><br>Recorded by <b>{MapFullName}</b><br>Location: <b>{MapLoc}</b><br>Altitude: <b>{MapAlt} metres</b><br>Quantity <b>{MapQuantity}</b> {MapStageName}"
    };
    adultFeatureLayer.popupTemplate = popupTemplate;
    eggFeatureLayer.popupTemplate = popupTemplate;
    webFeatureLayer.popupTemplate = popupTemplate;
    larvaFeatureLayer.popupTemplate = popupTemplate;
    pupaFeatureLayer.popupTemplate = popupTemplate;
    switch (coords.Stage) {
      case "E":
        eggFeatureLayer.source.push(graphic);
        var someEggs = true;
        break;
      case "W":
        webFeatureLayer.source.push(graphic);
        var someWebs = true;
        break;
      case "L":
        larvaFeatureLayer.source.push(graphic);
        var someLarvae = true;
        break;
      case "P":
        pupaFeatureLayer.source.push(graphic);
        var somePupae = true;
        break;
      default:
        adultFeatureLayer.source.push(graphic);
        var someAdults = true;
        break;
    }
  });
  var layerCount = 0;
  const ShowLayers = new LayerList({
    label: "Life cycle stages",
    view: view,
    listItemCreatedFunction: async (event) => {
      const item = event.item;
      item.panel = {
        content: "legend",
        open: true
      };
      if (item) {
        const count = await item.layer.queryFeatureCount();
        if (count === 0) {
          item.layer.listMode = "hide";
        }
      }
      // const item = event.item;
      // layerCount++;
      // console.log(layerCount, item.title);
      // if (
      //   (item.title === "Larval webs" && someWebs === false) ||
      //   (item.title === "Pupae" && somePupae === false)
      // ) {
      //   item.visible = false;
      // }
      // if (item.visible === true) {
      //   item.panel = {
      //     content: "legend",
      //     open: true
      //   };
      // }
    },
    container: ShowLayersDiv
  });
  console.log(map.layers);
});
!
999px

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