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Remove a Polyline

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JavaScript
// This example adds a UI control allowing users to remove the polyline from the
// map.

var flightPath;
var map;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 3,
    center: {lat: 0, lng: -180},
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });

  var flightPathCoordinates = [
    {lat: 37.772, lng: -122.214},
    {lat: 21.291, lng: -157.821},
    {lat: -18.142, lng: 178.431},
    {lat: -27.467, lng: 153.027}
  ];

  flightPath = new google.maps.Polyline({
    path: flightPathCoordinates,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2
  });

  addLine();
}

function addLine() {
  flightPath.setMap(map);
}

function removeLine() {
  flightPath.setMap(null);
}
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Remove a Polyline</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
#panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
}

/**
 * Provide the following styles for both ID and class, where ID represents an
 * actual existing "panel" with JS bound to its name, and the class is just
 * non-map content that may already have a different ID with JS bound to its
 * name.
 */

#panel, .panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#panel select, #panel input, .panel select, .panel input {
  font-size: 15px;
}

#panel select, .panel select {
  width: 100%;
}

#panel i, .panel i {
  font-size: 12px;
}

    </style>
  </head>
  <body>
    <div id="panel">
      <input onclick="removeLine();" type=button value="Remove line">
      <input onclick="addLine();" type=button value="Restore line">
    </div>
    <div id="map"></div>
    <script>

// This example adds a UI control allowing users to remove the polyline from the
// map.

var flightPath;
var map;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 3,
    center: {lat: 0, lng: -180},
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });

  var flightPathCoordinates = [
    {lat: 37.772, lng: -122.214},
    {lat: 21.291, lng: -157.821},
    {lat: -18.142, lng: 178.431},
    {lat: -27.467, lng: 153.027}
  ];

  flightPath = new google.maps.Polyline({
    path: flightPathCoordinates,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2
  });

  addLine();
}

function addLine() {
  flightPath.setMap(map);
}

function removeLine() {
  flightPath.setMap(null);
}

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"></script>
  </body>
</html>

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