Introduction to geocoding

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    <script src="https://unpkg.com/@esri/arcgis-rest-request@4.0.0/dist/bundled/request.umd.js"></script>
    <script src="https://unpkg.com/@esri/arcgis-rest-geocoding@4.0.0/dist/bundled/geocoding.umd.js"></script>

    <script>

        const query = document.getElementById("geocode-input").value;

        const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);

        const center = ol.proj.transform(map.getView().getCenter(), "EPSG:3857", "EPSG:4326");

        arcgisRest
          .geocode({
            singleLine: query,
            authentication,

            params: {
              outFields: "*",
              location: center.join(","),
              outSR: 3857 // Request coordinates in Web Mercator to simplify displaying
            }
          })

          .then((response) => {
            const result = response.candidates[0];
            if (!result === 0) {
              alert("That query didn't match any geocoding results.");
              return;
            }

            const coords = [result.location.x, result.location.y];

            popup.show(coords, result.attributes.LongLabel);
            map.getView().setCenter(coords);

          })

    </script>