Client-side projection

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This sample demonstrates how the geometries of client side features, whether added as graphics to the MapView or as a GeoJSONLayer, are automatically projected using the client-side projection module.

The MapView's spatialReference is switched on the fly to a projected spatial reference selected by the user.

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
    <title>Client-side projection | Sample | ArcGIS API for JavaScript 4.23</title>
    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        background-color: #ffffff;
      #projectionDiv {
        position: absolute;
        top: 10px;
        right: 10px;
        background: #ffffff;
        padding: 10px;
    </style>

    <link rel="stylesheet" href="https://js.arcgis.com/4.23/esri/themes/light/main.css" />
    <script src="https://js.arcgis.com/4.23/"></script>

    <script>
      require([
        "esri/views/MapView",
        "esri/Map",
        "esri/geometry/SpatialReference",
        "esri/layers/GeoJSONLayer",
        "esri/core/reactiveUtils",
        "esri/widgets/Legend"
      ], (
        Map,
      ) => {
        // display projected graphics as a FeatureLayer
        const countriesLayer = new GeoJSONLayer({
          title: "Forest area by country",
          url: "https://developers.arcgis.com/javascript/latest/sample-code/client-projection/live/percent-forest-area.json",
          objectIdField: "OBJECTID",
          fields: [
              name: "OBJECTID",
              alias: "ObjectID",
              type: "oid"
              name: "Country",
              alias: "Country",
              type: "string"
              name: "y2015",
              alias: "% forest area (2015)",
              type: "double"
          popupTemplate: {
            title: "{Country}",
            content: "{expression/per-land-area}",
            expressionInfos: [
                title: "per-land-area",
                name: "per-land-area",
                expression:
                  "IIF(!IsEmpty($feature.y2015), Round($feature.y2015) + '% of the land area in this country is forest.', 'No data')"
          renderer: {
            type: "class-breaks",
            defaultLabel: "No data",
            defaultSymbol: {
              type: "simple-fill",
              color: "#fcedcd",
              outline: {
                color: [255, 255, 255, 0.1],
                width: 0.5
            visualVariables: [
                type: "color",
                field: "y2015",
                stops: [
                  { value: 0, color: "#D0D0CB" },
                  { value: 50, color: "#4F6704" }
        // Reproject the data to the projection selected by the user
        const wkidSelect = document.getElementById("projectWKID");
        wkidSelect.addEventListener("change", () => {
          view.spatialReference = {
            wkid: wkidSelect.value
          };
          centerPoint.spatialReference = {
            wkid: wkidSelect.value
          };
          view.center = centerPoint;
        });
        const viewSpatialReference = new SpatialReference({
          wkid: wkidSelect.value
        let centerPoint = {
          x: 0,
          y: 0,
          spatialReference: viewSpatialReference
        const view = new MapView({
          container: "viewDiv",
          map: new Map({
            layers: [countriesLayer]
          highlightOptions: {
            fillOpacity: 0
          spatialReference: viewSpatialReference,
          center: centerPoint,
          scale: 166418924
          symbol: {
            type: "simple-fill",
            color: null,
            outline: {
              width: 0.5,
              color: [208, 208, 203, 0.7]
          geometry: {
            type: "extent",
            xmin: -180,
            xmax: 180,
            ymin: -90,
            ymax: 90,
            // This geometry automatically reprojects when added to the view
            spatialReference: SpatialReference.WGS84
        document.getElementById("viewSRDiv").innerHTML = `view.SR.wkid = <b>${view.spatialReference.wkid}</b>`;
        view.watch("spatialReference", () => {
          document.getElementById(
            "viewSRDiv"
          ).innerHTML = `view.SR.wkid = <b>${view.spatialReference.wkid}</b>`;
        view.ui.add(new Legend({ view: view }), "bottom-left");
        view.whenLayerView(countriesLayer).then((layerView) => {
            .whenOnce(() => !view.updating)
            .then(() => {
              wkidSelect.disabled = false;
    </script>
  </head>

  <body>
    <div id="viewDiv">
      <div id="projectionDiv" class="esri-widget">
        <p>Select a projection</p>
        <select id="projectWKID" class="esri-widget" disabled>
          <option value="8857" selected>Equal Earth Greenwich</option>
          <option value="8858">Equal Earth Americas</option>
          <option value="8859">Equal Earth Asia-Pacific</option>
          <option value="54042">Winkel III</option>
          <option value="54050">World Fuller</option>
          <option value="54010">World Eckert VI</option>
          <option value="54021">World Polyconic</option>
          <option value="54016">World Gall Stereographic</option>
          <option value="54008">World Sinusoidal</option>
          <option value="54023">World Loximuthal</option>
          <option value="54024">World Bonne</option>
        </select><br/><br/>
        <div id="viewSRDiv" class="esri-widget paddings"></div><br/>
      </div>
    </div>
  </body>
</html>

Known Limitations

The browser must support WebAssembly if a spatial reference other than WGS84 or Web Mercator is specified.

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