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To start developing, please head over to our developer documentation.

Activate the Google Maps JavaScript API

To get you started we'll guide you through the Google Developers Console to do a few things first:

  1. Create or choose a project
  2. Activate the Google Maps JavaScript API and related services
  3. Create appropriate keys
Continue

Deleting a vertex

This example demonstrates vertex deletion. Right-click on a vertex to show a "Delete" menu.

View this example fullscreen.

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

  var map = new google.maps.Map(document.getElementById('map'), mapOptions);

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

  var deleteMenu = new DeleteMenu();

  google.maps.event.addListener(flightPath, 'rightclick', function(e) {
    // Check if click was on a vertex control point
    if (e.vertex == undefined) {
      return;
    }
    deleteMenu.open(map, flightPath.getPath(), e.vertex);
  });
}

/**
 * A menu that lets a user delete a selected vertex of a path.
 * @constructor
 */
function DeleteMenu() {
  this.div_ = document.createElement('div');
  this.div_.className = 'delete-menu';
  this.div_.innerHTML = 'Delete';

  var menu = this;
  google.maps.event.addDomListener(this.div_, 'click', function() {
    menu.removeVertex();
  });
}
DeleteMenu.prototype = new google.maps.OverlayView();

DeleteMenu.prototype.onAdd = function() {
  var deleteMenu = this;
  var 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', function(e) {
    if (e.target != deleteMenu.div_) {
      deleteMenu.close();
    }
  }, true);
};

DeleteMenu.prototype.onRemove = function() {
  google.maps.event.removeListener(this.divListener_);
  this.div_.parentNode.removeChild(this.div_);

  // clean up
  this.set('position');
  this.set('path');
  this.set('vertex');
};

DeleteMenu.prototype.close = function() {
  this.setMap(null);
};

DeleteMenu.prototype.draw = function() {
  var position = this.get('position');
  var projection = this.getProjection();

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

  var 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.
 */
DeleteMenu.prototype.open = function(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.
 */
DeleteMenu.prototype.removeVertex = function() {
  var path = this.get('path');
  var vertex = this.get('vertex');

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

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

google.maps.event.addDomListener(window, 'load', initialize);
<div id="map"></div>
/* 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, .3);
  margin-top: -10px;
  margin-left: 10px;
  cursor: pointer;
}
.delete-menu:hover {
  background: #eee;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>

Try it yourself

Hover at top right of the code block to copy the code or open it in JSFiddle.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Deleting a vertex</title>
    <style>
      /* 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, .3);
        margin-top: -10px;
        margin-left: 10px;
        cursor: pointer;
      }
      .delete-menu:hover {
        background: #eee;
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>
    <script>
      function initialize() {
        var mapOptions = {
          zoom: 3,
          center: new google.maps.LatLng(0, -180),
          mapTypeId: 'terrain'
        };

        var map = new google.maps.Map(document.getElementById('map'), mapOptions);

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

        var deleteMenu = new DeleteMenu();

        google.maps.event.addListener(flightPath, 'rightclick', function(e) {
          // Check if click was on a vertex control point
          if (e.vertex == undefined) {
            return;
          }
          deleteMenu.open(map, flightPath.getPath(), e.vertex);
        });
      }

      /**
       * A menu that lets a user delete a selected vertex of a path.
       * @constructor
       */
      function DeleteMenu() {
        this.div_ = document.createElement('div');
        this.div_.className = 'delete-menu';
        this.div_.innerHTML = 'Delete';

        var menu = this;
        google.maps.event.addDomListener(this.div_, 'click', function() {
          menu.removeVertex();
        });
      }
      DeleteMenu.prototype = new google.maps.OverlayView();

      DeleteMenu.prototype.onAdd = function() {
        var deleteMenu = this;
        var 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', function(e) {
          if (e.target != deleteMenu.div_) {
            deleteMenu.close();
          }
        }, true);
      };

      DeleteMenu.prototype.onRemove = function() {
        google.maps.event.removeListener(this.divListener_);
        this.div_.parentNode.removeChild(this.div_);

        // clean up
        this.set('position');
        this.set('path');
        this.set('vertex');
      };

      DeleteMenu.prototype.close = function() {
        this.setMap(null);
      };

      DeleteMenu.prototype.draw = function() {
        var position = this.get('position');
        var projection = this.getProjection();

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

        var 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.
       */
      DeleteMenu.prototype.open = function(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.
       */
      DeleteMenu.prototype.removeVertex = function() {
        var path = this.get('path');
        var vertex = this.get('vertex');

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

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

      google.maps.event.addDomListener(window, 'load', initialize);
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

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