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Add Circle on Marker Click in Google Maps

In this example you will learn how to add circle on marker click in google map.

Here you can view the output of the example and you can also "try it yourself" by clicking on "Live Demo" button given at the bottom.

Syntax

var marker = new google.maps.Marker({    
    position: lat_lng,    
    map: map    
  });  

  // This event listener will call addMarker() when the map is clicked.    
  marker.addListener('click', function(event) {    
    addCircle(event.latLng);    
  });
  
function addCircle(location) {    
  // Add the circle for this city to the map.    
    var cityCircle = new google.maps.Circle({    
      strokeColor: '#FF0000',    
      strokeOpacity: 0.8,    
      strokeWeight: 2,    
      fillColor: '#FF0000',    
      fillOpacity: 0.35,    
      map: map,    
      center: location,    
      radius: 199999.45454,  
      draggable:false  
    });  
} 

Add Circle on Marker Click in Google Maps Example

<!DOCTYPE html>    
<html>    
  <head>  <!-- www.techstrikers.com -->
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">    
    <meta charset="utf-8">    
    <title>Draw Circle on Marker Click on Google Map</title>    
    <style>    
      html, body {    
        height: 100%;    
        margin: 0;    
        padding: 0;    
      }    
      #map {    
        height: 99%;  
        width: 99%  
      }    
    </style>    
        <script async defer    
        src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"></script>    
        <script> 
          
var markers = [];
 var map;
// First, create an object containing LatLng and population for each city.    
var citymap = {lat:21.002471054356725, lng:79.12353515625};  
    
function initMap() {    
  var lat_lng = {lat: 22.08672, lng: 79.42444};     
  map = new google.maps.Map(document.getElementById('map'), {    
    zoom: 6,    
    center: lat_lng,    
    mapTypeId: google.maps.MapTypeId.TERRAIN    
  });    

  var marker = new google.maps.Marker({    
    position: lat_lng,    
    map: map    
  });  

  // This event listener will call addMarker() when the map is clicked.    
  marker.addListener('click', function(event) {    
    addCircle(event.latLng);    
  }); 

} 
   
function addCircle(location) {    
  // Add the circle for this city to the map.    
    var cityCircle = new google.maps.Circle({    
      strokeColor: '#FF0000',    
      strokeOpacity: 0.8,    
      strokeWeight: 2,    
      fillColor: '#FF0000',    
      fillOpacity: 0.35,    
      map: map,    
      center: location,    
      radius: 199999.45454,  
      draggable:false  
    });  
} 
    </script>    
  </head>    
  <body>    
    <div id="map"></div>    
  </body>    
</html>

Above example will produce following output