Data Layer: Drag and Drop GeoJSON

This example allows you to drag and drop GeoJSON onto the map. Download a sample GeoJSON file to test dragging from the device.

For more information about how to work with the map data layer, see the google.maps.Data class.

TypeScript

let map: google.maps.Map;

function initMap(): void {
  // set up the map
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    center: new google.maps.LatLng(0, 0),
    zoom: 4,
  });
}

function loadGeoJsonString(geoString: string) {
  try {
    const geojson = JSON.parse(geoString) as any;
    map.data.addGeoJson(geojson);
  } catch (e) {
    alert("Not a GeoJSON file!");
  }
  zoom(map);
}

/**
 * Update a map's viewport to fit each geometry in a dataset
 */
function zoom(map: google.maps.Map) {
  const bounds = new google.maps.LatLngBounds();
  map.data.forEach((feature) => {
    const geometry = feature.getGeometry();

    if (geometry) {
      processPoints(geometry, bounds.extend, bounds);
    }
  });
  map.fitBounds(bounds);
}

/**
 * Process each point in a Geometry, regardless of how deep the points may lie.
 */
function processPoints(
  geometry: google.maps.LatLng | google.maps.Data.Geometry,
  callback: any,
  thisArg: google.maps.LatLngBounds
) {
  if (geometry instanceof google.maps.LatLng) {
    callback.call(thisArg, geometry);
  } else if (geometry instanceof google.maps.Data.Point) {
    callback.call(thisArg, geometry.get());
  } else {
    // @ts-ignore
    geometry.getArray().forEach((g) => {
      processPoints(g, callback, thisArg);
    });
  }
}

/* DOM (drag/drop) functions */
function initEvents() {
  [...document.getElementsByClassName("file")].forEach((fileElement) => {
    fileElement.addEventListener(
      "dragstart",
      (e: Event) => {
        // @ts-ignore
        e.dataTransfer.setData(
          "text/plain",
          JSON.stringify(files[Number((e.target as HTMLElement).dataset.value)])
        );
        console.log(e);
      },
      false
    );
  });

  // set up the drag & drop events
  const mapContainer = document.getElementById("map") as HTMLElement;

  mapContainer.addEventListener("dragenter", addClassToDropTarget, false);
  mapContainer.addEventListener("dragover", addClassToDropTarget, false);
  mapContainer.addEventListener("drop", handleDrop, false);
  mapContainer.addEventListener("dragleave", removeClassFromDropTarget, false);
}

function addClassToDropTarget(e: Event) {
  e.stopPropagation();
  e.preventDefault();
  document.getElementById("map")!.classList.add("over");
  return false;
}

function removeClassFromDropTarget(e: Event) {
  document.getElementById("map")!.classList.remove("over");
}

function handleDrop(e: DragEvent) {
  e.preventDefault();
  e.stopPropagation();
  removeClassFromDropTarget(e);
  const files = (e.dataTransfer as DataTransfer).files;

  if (files.length) {
    // process file(s) being dropped
    // grab the file data from each file
    for (let i = 0, file; (file = files[i]); i++) {
      const reader = new FileReader();

      reader.onload = function (e) {
        loadGeoJsonString(reader.result as string);
      };

      reader.onerror = function (e) {
        console.error("reading failed");
      };
      reader.readAsText(file);
    }
  } else {
    // process non-file (e.g. text or html) content being dropped
    // grab the plain text version of the data
    const plainText = (e.dataTransfer as DataTransfer).getData("text/plain");
    console.log(plainText);

    if (plainText) {
      loadGeoJsonString(plainText);
    }
  }

  // prevent drag event from bubbling further
  return false;
}

function initialize() {
  initMap();
  initEvents();
}

const files = [
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Polygon",
          coordinates: [
            [
              [-99.49218749999999, -11.867350911459294],
              [24.960937499999996, -11.867350911459294],
              [24.960937499999996, 47.517200697839414],
              [-99.49218749999999, 47.517200697839414],
              [-99.49218749999999, -11.867350911459294],
            ],
          ],
        },
      },
    ],
  },
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [81.2109375, 50.064191736659104],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [103.35937499999999, -47.98992166741417],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-46.05468749999999, 64.01449619484472],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-113.203125, 37.996162679728116],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-73.828125, -32.249974455863295],
        },
      },
    ],
  },
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "LineString",
          coordinates: [
            [147.65625, -5.266007882805485],
            [118.47656249999999, 43.83452678223682],
            [80.85937499999999, -30.145127183376115],
            [35.15625, 51.83577752045248],
            [-15.468749999999998, -23.563987128451217],
            [-29.53125, 44.33956524809713],
            [-73.47656249999999, -32.842673631954305],
            [-104.765625, 35.460669951495305],
          ],
        },
      },
    ],
  },
];
index.ts

Note: Read the guide on using TypeScript and Google Maps.

JavaScript

let map;

function initMap() {
  // set up the map
  map = new google.maps.Map(document.getElementById("map"), {
    center: new google.maps.LatLng(0, 0),
    zoom: 4,
  });
}

function loadGeoJsonString(geoString) {
  try {
    const geojson = JSON.parse(geoString);
    map.data.addGeoJson(geojson);
  } catch (e) {
    alert("Not a GeoJSON file!");
  }
  zoom(map);
}

/**
 * Update a map's viewport to fit each geometry in a dataset
 */
function zoom(map) {
  const bounds = new google.maps.LatLngBounds();
  map.data.forEach((feature) => {
    const geometry = feature.getGeometry();

    if (geometry) {
      processPoints(geometry, bounds.extend, bounds);
    }
  });
  map.fitBounds(bounds);
}

/**
 * Process each point in a Geometry, regardless of how deep the points may lie.
 */
function processPoints(geometry, callback, thisArg) {
  if (geometry instanceof google.maps.LatLng) {
    callback.call(thisArg, geometry);
  } else if (geometry instanceof google.maps.Data.Point) {
    callback.call(thisArg, geometry.get());
  } else {
    geometry.getArray().forEach((g) => {
      processPoints(g, callback, thisArg);
    });
  }
}

/* DOM (drag/drop) functions */
function initEvents() {
  [...document.getElementsByClassName("file")].forEach((fileElement) => {
    fileElement.addEventListener(
      "dragstart",
      (e) => {
        e.dataTransfer.setData(
          "text/plain",
          JSON.stringify(files[Number(e.target.dataset.value)])
        );
        console.log(e);
      },
      false
    );
  });
  // set up the drag & drop events
  const mapContainer = document.getElementById("map");
  mapContainer.addEventListener("dragenter", addClassToDropTarget, false);
  mapContainer.addEventListener("dragover", addClassToDropTarget, false);
  mapContainer.addEventListener("drop", handleDrop, false);
  mapContainer.addEventListener("dragleave", removeClassFromDropTarget, false);
}

function addClassToDropTarget(e) {
  e.stopPropagation();
  e.preventDefault();
  document.getElementById("map").classList.add("over");
  return false;
}

function removeClassFromDropTarget(e) {
  document.getElementById("map").classList.remove("over");
}

function handleDrop(e) {
  e.preventDefault();
  e.stopPropagation();
  removeClassFromDropTarget(e);
  const files = e.dataTransfer.files;

  if (files.length) {
    // process file(s) being dropped
    // grab the file data from each file
    for (let i = 0, file; (file = files[i]); i++) {
      const reader = new FileReader();

      reader.onload = function (e) {
        loadGeoJsonString(reader.result);
      };

      reader.onerror = function (e) {
        console.error("reading failed");
      };
      reader.readAsText(file);
    }
  } else {
    // process non-file (e.g. text or html) content being dropped
    // grab the plain text version of the data
    const plainText = e.dataTransfer.getData("text/plain");
    console.log(plainText);

    if (plainText) {
      loadGeoJsonString(plainText);
    }
  }
  // prevent drag event from bubbling further
  return false;
}

function initialize() {
  initMap();
  initEvents();
}
const files = [
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Polygon",
          coordinates: [
            [
              [-99.49218749999999, -11.867350911459294],
              [24.960937499999996, -11.867350911459294],
              [24.960937499999996, 47.517200697839414],
              [-99.49218749999999, 47.517200697839414],
              [-99.49218749999999, -11.867350911459294],
            ],
          ],
        },
      },
    ],
  },
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [81.2109375, 50.064191736659104],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [103.35937499999999, -47.98992166741417],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-46.05468749999999, 64.01449619484472],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-113.203125, 37.996162679728116],
        },
      },
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Point",
          coordinates: [-73.828125, -32.249974455863295],
        },
      },
    ],
  },
  {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "LineString",
          coordinates: [
            [147.65625, -5.266007882805485],
            [118.47656249999999, 43.83452678223682],
            [80.85937499999999, -30.145127183376115],
            [35.15625, 51.83577752045248],
            [-15.468749999999998, -23.563987128451217],
            [-29.53125, 44.33956524809713],
            [-73.47656249999999, -32.842673631954305],
            [-104.765625, 35.460669951495305],
          ],
        },
      },
    ],
  },
];
index.js

Note: The JavaScript is compiled from the TypeScript snippet.

CSS

html {
  height: 100%;
}

body {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#map {
  height: 100%;
}
#map.over {
  opacity: 0.5;
  background-color: rgba(100, 100, 100, 0.5);
}

#sidebar {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: auto;
}

.file {
  display: flex;
  flex-flow: column;
  margin-top: 1em;
  cursor: move;
  text-align: center;
}
.file:hover .material-icons {
  color: darkorange;
}
.file:hover .filename {
  font-weight: bold;
}
.file .material-icons {
  font-size: 50px;
  color: orange;
}
.file .material-icons:hover {
  color: darkorange;
}
.file .filename {
  margin-top: 0.5em;
  font-size: 20px;
  color: #333333;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#container {
  height: 100%;
  display: flex;
}

#sidebar {
  flex-basis: 15rem;
  flex-grow: 1;
  padding: 1rem;
  max-width: 30rem;
  height: 100%;
  box-sizing: border-box;
  display: flex;
}

#map {
  flex-basis: 0;
  flex-grow: 4;
  height: 100%;
}
style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Data Layer: Drag and Drop GeoJSON</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link
      href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
      rel="stylesheet"
    />
    <link
      rel="stylesheet"
      href="https://fonts.googleapis.com/icon?family=Material+Icons"
    />

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="container">
      <div id="map"></div>
      <div id="sidebar" class="mdc-typography">
        <div class="file" draggable="true" data-value="0">
          <span class="material-icons">text_snippet</span>
          <div class="filename">polygons.geojson</div>
        </div>
        <div class="file" draggable="true" data-value="1">
          <span class="material-icons">text_snippet</span>
          <div class="filename">points.geojson</div>
        </div>
        <div class="file" draggable="true" data-value="2">
          <span class="material-icons">text_snippet</span>
          <div class="filename">polyline.geojson</div>
        </div>
      </div>
    </div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initialize&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
sample.html

All

<!DOCTYPE html>
<html>
  <head>
    <title>Data Layer: Drag and Drop GeoJSON</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link
      href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
      rel="stylesheet"
    />
    <link
      rel="stylesheet"
      href="https://fonts.googleapis.com/icon?family=Material+Icons"
    />

    <style type="text/css">
      html {
        height: 100%;
      }

      body {
        height: 100%;
        margin: 0;
        padding: 0;
        overflow: hidden;
      }

      #map {
        height: 100%;
      }
      #map.over {
        opacity: 0.5;
        background-color: rgba(100, 100, 100, 0.5);
      }

      #sidebar {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        overflow: auto;
      }

      .file {
        display: flex;
        flex-flow: column;
        margin-top: 1em;
        cursor: move;
        text-align: center;
      }
      .file:hover .material-icons {
        color: darkorange;
      }
      .file:hover .filename {
        font-weight: bold;
      }
      .file .material-icons {
        font-size: 50px;
        color: orange;
      }
      .file .material-icons:hover {
        color: darkorange;
      }
      .file .filename {
        margin-top: 0.5em;
        font-size: 20px;
        color: #333333;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }

      #container {
        height: 100%;
        display: flex;
      }

      #sidebar {
        flex-basis: 15rem;
        flex-grow: 1;
        padding: 1rem;
        max-width: 30rem;
        height: 100%;
        box-sizing: border-box;
        display: flex;
      }

      #map {
        flex-basis: 0;
        flex-grow: 4;
        height: 100%;
      }
    </style>
    <script>
      let map;

      function initMap() {
        // set up the map
        map = new google.maps.Map(document.getElementById("map"), {
          center: new google.maps.LatLng(0, 0),
          zoom: 4,
        });
      }

      function loadGeoJsonString(geoString) {
        try {
          const geojson = JSON.parse(geoString);
          map.data.addGeoJson(geojson);
        } catch (e) {
          alert("Not a GeoJSON file!");
        }
        zoom(map);
      }

      /**
       * Update a map's viewport to fit each geometry in a dataset
       */
      function zoom(map) {
        const bounds = new google.maps.LatLngBounds();
        map.data.forEach((feature) => {
          const geometry = feature.getGeometry();

          if (geometry) {
            processPoints(geometry, bounds.extend, bounds);
          }
        });
        map.fitBounds(bounds);
      }

      /**
       * Process each point in a Geometry, regardless of how deep the points may lie.
       */
      function processPoints(geometry, callback, thisArg) {
        if (geometry instanceof google.maps.LatLng) {
          callback.call(thisArg, geometry);
        } else if (geometry instanceof google.maps.Data.Point) {
          callback.call(thisArg, geometry.get());
        } else {
          geometry.getArray().forEach((g) => {
            processPoints(g, callback, thisArg);
          });
        }
      }

      /* DOM (drag/drop) functions */
      function initEvents() {
        [...document.getElementsByClassName("file")].forEach((fileElement) => {
          fileElement.addEventListener(
            "dragstart",
            (e) => {
              e.dataTransfer.setData(
                "text/plain",
                JSON.stringify(files[Number(e.target.dataset.value)])
              );
              console.log(e);
            },
            false
          );
        });
        // set up the drag & drop events
        const mapContainer = document.getElementById("map");
        mapContainer.addEventListener("dragenter", addClassToDropTarget, false);
        mapContainer.addEventListener("dragover", addClassToDropTarget, false);
        mapContainer.addEventListener("drop", handleDrop, false);
        mapContainer.addEventListener(
          "dragleave",
          removeClassFromDropTarget,
          false
        );
      }

      function addClassToDropTarget(e) {
        e.stopPropagation();
        e.preventDefault();
        document.getElementById("map").classList.add("over");
        return false;
      }

      function removeClassFromDropTarget(e) {
        document.getElementById("map").classList.remove("over");
      }

      function handleDrop(e) {
        e.preventDefault();
        e.stopPropagation();
        removeClassFromDropTarget(e);
        const files = e.dataTransfer.files;

        if (files.length) {
          // process file(s) being dropped
          // grab the file data from each file
          for (let i = 0, file; (file = files[i]); i++) {
            const reader = new FileReader();

            reader.onload = function (e) {
              loadGeoJsonString(reader.result);
            };

            reader.onerror = function (e) {
              console.error("reading failed");
            };
            reader.readAsText(file);
          }
        } else {
          // process non-file (e.g. text or html) content being dropped
          // grab the plain text version of the data
          const plainText = e.dataTransfer.getData("text/plain");
          console.log(plainText);

          if (plainText) {
            loadGeoJsonString(plainText);
          }
        }
        // prevent drag event from bubbling further
        return false;
      }

      function initialize() {
        initMap();
        initEvents();
      }
      const files = [
        {
          type: "FeatureCollection",
          features: [
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Polygon",
                coordinates: [
                  [
                    [-99.49218749999999, -11.867350911459294],
                    [24.960937499999996, -11.867350911459294],
                    [24.960937499999996, 47.517200697839414],
                    [-99.49218749999999, 47.517200697839414],
                    [-99.49218749999999, -11.867350911459294],
                  ],
                ],
              },
            },
          ],
        },
        {
          type: "FeatureCollection",
          features: [
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Point",
                coordinates: [81.2109375, 50.064191736659104],
              },
            },
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Point",
                coordinates: [103.35937499999999, -47.98992166741417],
              },
            },
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Point",
                coordinates: [-46.05468749999999, 64.01449619484472],
              },
            },
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Point",
                coordinates: [-113.203125, 37.996162679728116],
              },
            },
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "Point",
                coordinates: [-73.828125, -32.249974455863295],
              },
            },
          ],
        },
        {
          type: "FeatureCollection",
          features: [
            {
              type: "Feature",
              properties: {},
              geometry: {
                type: "LineString",
                coordinates: [
                  [147.65625, -5.266007882805485],
                  [118.47656249999999, 43.83452678223682],
                  [80.85937499999999, -30.145127183376115],
                  [35.15625, 51.83577752045248],
                  [-15.468749999999998, -23.563987128451217],
                  [-29.53125, 44.33956524809713],
                  [-73.47656249999999, -32.842673631954305],
                  [-104.765625, 35.460669951495305],
                ],
              },
            },
          ],
        },
      ];
    </script>
  </head>
  <body>
    <div id="container">
      <div id="map"></div>
      <div id="sidebar" class="mdc-typography">
        <div class="file" draggable="true" data-value="0">
          <span class="material-icons">text_snippet</span>
          <div class="filename">polygons.geojson</div>
        </div>
        <div class="file" draggable="true" data-value="1">
          <span class="material-icons">text_snippet</span>
          <div class="filename">points.geojson</div>
        </div>
        <div class="file" draggable="true" data-value="2">
          <span class="material-icons">text_snippet</span>
          <div class="filename">polyline.geojson</div>
        </div>
      </div>
    </div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initialize&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
inline.html

let map; function initMap() { // set up the map map = new google.maps.Map(document.getElementById("map"), { center: new google.maps.LatLng(0, 0), zoom: 4, }); } function loadGeoJsonString(geoString) { try { const geojson = JSON.parse(geoString); map.data.addGeoJson(geojson); } catch (e) { alert("Not a GeoJSON file!"); } zoom(map); } /** * Update a map's viewport to fit each geometry in a dataset */ function zoom(map) { const bounds = new google.maps.LatLngBounds(); map.data.forEach((feature) => { const geometry = feature.getGeometry(); if (geometry) { processPoints(geometry, bounds.extend, bounds); } }); map.fitBounds(bounds); } /** * Process each point in a Geometry, regardless of how deep the points may lie. */ function processPoints(geometry, callback, thisArg) { if (geometry instanceof google.maps.LatLng) { callback.call(thisArg, geometry); } else if (geometry instanceof google.maps.Data.Point) { callback.call(thisArg, geometry.get()); } else { geometry.getArray().forEach((g) => { processPoints(g, callback, thisArg); }); } } /* DOM (drag/drop) functions */ function initEvents() { [...document.getElementsByClassName("file")].forEach((fileElement) => { fileElement.addEventListener( "dragstart", (e) => { e.dataTransfer.setData( "text/plain", JSON.stringify(files[Number(e.target.dataset.value)]) ); console.log(e); }, false ); }); // set up the drag & drop events const mapContainer = document.getElementById("map"); mapContainer.addEventListener("dragenter", addClassToDropTarget, false); mapContainer.addEventListener("dragover", addClassToDropTarget, false); mapContainer.addEventListener("drop", handleDrop, false); mapContainer.addEventListener("dragleave", removeClassFromDropTarget, false); } function addClassToDropTarget(e) { e.stopPropagation(); e.preventDefault(); document.getElementById("map").classList.add("over"); return false; } function removeClassFromDropTarget(e) { document.getElementById("map").classList.remove("over"); } function handleDrop(e) { e.preventDefault(); e.stopPropagation(); removeClassFromDropTarget(e); const files = e.dataTransfer.files; if (files.length) { // process file(s) being dropped // grab the file data from each file for (let i = 0, file; (file = files[i]); i++) { const reader = new FileReader(); reader.onload = function (e) { loadGeoJsonString(reader.result); }; reader.onerror = function (e) { console.error("reading failed"); }; reader.readAsText(file); } } else { // process non-file (e.g. text or html) content being dropped // grab the plain text version of the data const plainText = e.dataTransfer.getData("text/plain"); console.log(plainText); if (plainText) { loadGeoJsonString(plainText); } } // prevent drag event from bubbling further return false; } function initialize() { initMap(); initEvents(); } const files = [ { type: "FeatureCollection", features: [ { type: "Feature", properties: {}, geometry: { type: "Polygon", coordinates: [ [ [-99.49218749999999, -11.867350911459294], [24.960937499999996, -11.867350911459294], [24.960937499999996, 47.517200697839414], [-99.49218749999999, 47.517200697839414], [-99.49218749999999, -11.867350911459294], ], ], }, }, ], }, { type: "FeatureCollection", features: [ { type: "Feature", properties: {}, geometry: { type: "Point", coordinates: [81.2109375, 50.064191736659104], }, }, { type: "Feature", properties: {}, geometry: { type: "Point", coordinates: [103.35937499999999, -47.98992166741417], }, }, { type: "Feature", properties: {}, geometry: { type: "Point", coordinates: [-46.05468749999999, 64.01449619484472], }, }, { type: "Feature", properties: {}, geometry: { type: "Point", coordinates: [-113.203125, 37.996162679728116], }, }, { type: "Feature", properties: {}, geometry: { type: "Point", coordinates: [-73.828125, -32.249974455863295], }, }, ], }, { type: "FeatureCollection", features: [ { type: "Feature", properties: {}, geometry: { type: "LineString", coordinates: [ [147.65625, -5.266007882805485], [118.47656249999999, 43.83452678223682], [80.85937499999999, -30.145127183376115], [35.15625, 51.83577752045248], [-15.468749999999998, -23.563987128451217], [-29.53125, 44.33956524809713], [-73.47656249999999, -32.842673631954305], [-104.765625, 35.460669951495305], ], }, }, ], }, ];

html { height: 100%; } body { height: 100%; margin: 0; padding: 0; overflow: hidden; } #map { height: 100%; } #map.over { opacity: 0.5; background-color: rgba(100, 100, 100, 0.5); } #sidebar { flex-direction: column; align-items: center; justify-content: center; overflow: auto; } .file { display: flex; flex-flow: column; margin-top: 1em; cursor: move; text-align: center; } .file:hover .material-icons { color: darkorange; } .file:hover .filename { font-weight: bold; } .file .material-icons { font-size: 50px; color: orange; } .file .material-icons:hover { color: darkorange; } .file .filename { margin-top: 0.5em; font-size: 20px; color: #333333; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } #container { height: 100%; display: flex; } #sidebar { flex-basis: 15rem; flex-grow: 1; padding: 1rem; max-width: 30rem; height: 100%; box-sizing: border-box; display: flex; } #map { flex-basis: 0; flex-grow: 4; height: 100%; }

<!DOCTYPE html> <html> <head> <title>Data Layer: Drag and Drop GeoJSON</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <link href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css" rel="stylesheet" /> <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons" /> <!-- jsFiddle will insert css and js --> </head> <body> <div id="container"> <div id="map"></div> <div id="sidebar" class="mdc-typography"> <div class="file" draggable="true" data-value="0"> <span class="material-icons">text_snippet</span> <div class="filename">polygons.geojson</div> </div> <div class="file" draggable="true" data-value="1"> <span class="material-icons">text_snippet</span> <div class="filename">points.geojson</div> </div> <div class="file" draggable="true" data-value="2"> <span class="material-icons">text_snippet</span> <div class="filename">polyline.geojson</div> </div> </div> </div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initialize&libraries=&v=weekly" async ></script> </body> </html>

Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npx @googlemaps/js-samples init layer-data-dragndrop DESTINATION_FOLDER

Run in Google Cloud Shell

Google Cloud Shell is an interactive shell environment for Google Cloud Platform that makes it easy for you to learn and experiment with GCP and manage your projects and resources from your web browser.

Run in Cloud Shell

Click the start button in the Cloud Shell tutorial.