Deleting a Vertex

This example demonstrates how a user can delete a vertex, or a point on the line, by right-clicking on a vertex to show a "Delete" menu.

TypeScript

function initialize() {
  const mapOptions = {
    zoom: 3,
    center: new google.maps.LatLng(0, -180),
    mapTypeId: "terrain",
  };

  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    mapOptions
  );

  const flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, -157.821856),
    new google.maps.LatLng(-18.142599, 178.431),
    new google.maps.LatLng(-27.46758, 153.027892),
  ];

  const flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    editable: true,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2,
    map: map,
  });

  /**
   * A menu that lets a user delete a selected vertex of a path.
   */
  class DeleteMenu extends google.maps.OverlayView {
    private div_: HTMLDivElement;
    private divListener_?: google.maps.MapsEventListener;

    constructor() {
      super();
      this.div_ = document.createElement("div");
      this.div_.className = "delete-menu";
      this.div_.innerHTML = "Delete";

      const menu = this;

      google.maps.event.addDomListener(this.div_, "click", () => {
        menu.removeVertex();
      });
    }

    onAdd() {
      const deleteMenu = this;
      const map = this.getMap() as google.maps.Map;

      this.getPanes()!.floatPane.appendChild(this.div_);

      // mousedown anywhere on the map except on the menu div will close the
      // menu.
      this.divListener_ = google.maps.event.addDomListener(
        map.getDiv(),
        "mousedown",
        (e: Event) => {
          if (e.target != deleteMenu.div_) {
            deleteMenu.close();
          }
        },
        true
      );
    }

    onRemove() {
      if (this.divListener_) {
        google.maps.event.removeListener(this.divListener_);
      }

      (this.div_.parentNode as HTMLElement).removeChild(this.div_);

      // clean up
      this.set("position", null);
      this.set("path", null);
      this.set("vertex", null);
    }

    close() {
      this.setMap(null);
    }

    draw() {
      const position = this.get("position");
      const projection = this.getProjection();

      if (!position || !projection) {
        return;
      }

      const point = projection.fromLatLngToDivPixel(position)!;

      this.div_.style.top = point.y + "px";
      this.div_.style.left = point.x + "px";
    }

    /**
     * Opens the menu at a vertex of a given path.
     */
    open(
      map: google.maps.Map,
      path: google.maps.MVCArray<google.maps.LatLng>,
      vertex: number
    ) {
      this.set("position", path.getAt(vertex));
      this.set("path", path);
      this.set("vertex", vertex);
      this.setMap(map);
      this.draw();
    }

    /**
     * Deletes the vertex from the path.
     */
    removeVertex() {
      const path = this.get("path");
      const vertex = this.get("vertex");

      if (!path || vertex == undefined) {
        this.close();
        return;
      }

      path.removeAt(vertex);
      this.close();
    }
  }

  const deleteMenu = new DeleteMenu();

  google.maps.event.addListener(flightPath, "contextmenu", (e: any) => {
    // Check if click was on a vertex control point
    if (e.vertex == undefined) {
      return;
    }

    deleteMenu.open(map, flightPath.getPath(), e.vertex);
  });
}

JavaScript

function initialize() {
  const mapOptions = {
    zoom: 3,
    center: new google.maps.LatLng(0, -180),
    mapTypeId: "terrain",
  };
  const map = new google.maps.Map(document.getElementById("map"), mapOptions);
  const flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, -157.821856),
    new google.maps.LatLng(-18.142599, 178.431),
    new google.maps.LatLng(-27.46758, 153.027892),
  ];
  const flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    editable: true,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2,
    map: map,
  });

  /**
   * A menu that lets a user delete a selected vertex of a path.
   */
  class DeleteMenu extends google.maps.OverlayView {
    div_;
    divListener_;
    constructor() {
      super();
      this.div_ = document.createElement("div");
      this.div_.className = "delete-menu";
      this.div_.innerHTML = "Delete";

      const menu = this;

      google.maps.event.addDomListener(this.div_, "click", () => {
        menu.removeVertex();
      });
    }
    onAdd() {
      const deleteMenu = this;
      const map = this.getMap();

      this.getPanes().floatPane.appendChild(this.div_);
      // mousedown anywhere on the map except on the menu div will close the
      // menu.
      this.divListener_ = google.maps.event.addDomListener(
        map.getDiv(),
        "mousedown",
        (e) => {
          if (e.target != deleteMenu.div_) {
            deleteMenu.close();
          }
        },
        true
      );
    }
    onRemove() {
      if (this.divListener_) {
        google.maps.event.removeListener(this.divListener_);
      }

      this.div_.parentNode.removeChild(this.div_);
      // clean up
      this.set("position", null);
      this.set("path", null);
      this.set("vertex", null);
    }
    close() {
      this.setMap(null);
    }
    draw() {
      const position = this.get("position");
      const projection = this.getProjection();

      if (!position || !projection) {
        return;
      }

      const point = projection.fromLatLngToDivPixel(position);

      this.div_.style.top = point.y + "px";
      this.div_.style.left = point.x + "px";
    }
    /**
     * Opens the menu at a vertex of a given path.
     */
    open(map, path, vertex) {
      this.set("position", path.getAt(vertex));
      this.set("path", path);
      this.set("vertex", vertex);
      this.setMap(map);
      this.draw();
    }
    /**
     * Deletes the vertex from the path.
     */
    removeVertex() {
      const path = this.get("path");
      const vertex = this.get("vertex");

      if (!path || vertex == undefined) {
        this.close();
        return;
      }

      path.removeAt(vertex);
      this.close();
    }
  }

  const deleteMenu = new DeleteMenu();

  google.maps.event.addListener(flightPath, "contextmenu", (e) => {
    // Check if click was on a vertex control point
    if (e.vertex == undefined) {
      return;
    }

    deleteMenu.open(map, flightPath.getPath(), e.vertex);
  });
}

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

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

.delete-menu {
  position: absolute;
  background: white;
  padding: 3px;
  color: #666;
  font-weight: bold;
  border: 1px solid #999;
  font-family: sans-serif;
  font-size: 12px;
  box-shadow: 1px 3px 3px rgba(0, 0, 0, 0.3);
  margin-top: -10px;
  margin-left: 10px;
  cursor: pointer;
}

.delete-menu:hover {
  background: #eee;
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Deleting a Vertex</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></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&v=weekly"
      async
    ></script>
  </body>
</html>
function initialize() { const mapOptions = { zoom: 3, center: new google.maps.LatLng(0, -180), mapTypeId: "terrain", }; const map = new google.maps.Map(document.getElementById("map"), mapOptions); const flightPlanCoordinates = [ new google.maps.LatLng(37.772323, -122.214897), new google.maps.LatLng(21.291982, -157.821856), new google.maps.LatLng(-18.142599, 178.431), new google.maps.LatLng(-27.46758, 153.027892), ]; const flightPath = new google.maps.Polyline({ path: flightPlanCoordinates, editable: true, strokeColor: "#FF0000", strokeOpacity: 1.0, strokeWeight: 2, map: map, }); /** * A menu that lets a user delete a selected vertex of a path. */ class DeleteMenu extends google.maps.OverlayView { div_; divListener_; constructor() { super(); this.div_ = document.createElement("div"); this.div_.className = "delete-menu"; this.div_.innerHTML = "Delete"; const menu = this; google.maps.event.addDomListener(this.div_, "click", () => { menu.removeVertex(); }); } onAdd() { const deleteMenu = this; const map = this.getMap(); this.getPanes().floatPane.appendChild(this.div_); // mousedown anywhere on the map except on the menu div will close the // menu. this.divListener_ = google.maps.event.addDomListener( map.getDiv(), "mousedown", (e) => { if (e.target != deleteMenu.div_) { deleteMenu.close(); } }, true ); } onRemove() { if (this.divListener_) { google.maps.event.removeListener(this.divListener_); } this.div_.parentNode.removeChild(this.div_); // clean up this.set("position", null); this.set("path", null); this.set("vertex", null); } close() { this.setMap(null); } draw() { const position = this.get("position"); const projection = this.getProjection(); if (!position || !projection) { return; } const point = projection.fromLatLngToDivPixel(position); this.div_.style.top = point.y + "px"; this.div_.style.left = point.x + "px"; } /** * Opens the menu at a vertex of a given path. */ open(map, path, vertex) { this.set("position", path.getAt(vertex)); this.set("path", path); this.set("vertex", vertex); this.setMap(map); this.draw(); } /** * Deletes the vertex from the path. */ removeVertex() { const path = this.get("path"); const vertex = this.get("vertex"); if (!path || vertex == undefined) { this.close(); return; } path.removeAt(vertex); this.close(); } } const deleteMenu = new DeleteMenu(); google.maps.event.addListener(flightPath, "contextmenu", (e) => { // Check if click was on a vertex control point if (e.vertex == undefined) { return; } deleteMenu.open(map, flightPath.getPath(), e.vertex); }); }
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; } .delete-menu { position: absolute; background: white; padding: 3px; color: #666; font-weight: bold; border: 1px solid #999; font-family: sans-serif; font-size: 12px; box-shadow: 1px 3px 3px rgba(0, 0, 0, 0.3); margin-top: -10px; margin-left: 10px; cursor: pointer; } .delete-menu:hover { background: #eee; }
<!DOCTYPE html> <html> <head> <title>Deleting a Vertex</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></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=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initialize&v=weekly&channel=2" async ></script> </body> </html>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

  git clone -b sample-delete-vertex-menu git@github.com:googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME.

  git checkout sample-SAMPLE_NAME
  npm i
  npm start