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Zoom Changed Event Listener in Google Maps

In this example you will learn how to add zoom changed event listener to google map. This event fires when the map zoom property changes.

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

//Adding zoom_changed event listener here
  map.addListener('zoom_changed', function() {  
    document.getElementById('panel').innerHTML  = 'Zoom Changed';
    window.setTimeout(function() {  
      document.getElementById('panel').innerHTML = '';
    }, 2000);  
  });

Zoom Changed Event Listener in Google Maps Example

<!DOCTYPE html>  
<html>  
  <head>  <!-- www.techstrikers.com -->  
    <title>Tilt Changed Event</title>  
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">  
    <meta charset="utf-8">  
    <style>  
      html, body {  
        height: 100%;  
        margin: 0;  
        padding: 0;  
      }  
      #map {  
        height: 99%;
        width: 99%;
      }
#panel {    
  position: absolute;    
  top: 230px;    
  left: 40%;    
  z-index: 5;    
  padding: 0px;    
  border: 0px solid #999;    
  text-align: center; 
  background:#0000FF;
  width:150px;
  color:#fff;
}    
 
#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>  
    
    <script src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap" async defer>  
    </script>  
    <script>  
function initMap() {  
  var lat_lng = {lat: 22.08672, lng: 79.42444};   
  
  var map = new google.maps.Map(document.getElementById('map'), {  
    zoom: 6,  
    center: lat_lng  
  });  
  //Adding zoom_changed event listener here
  map.addListener('zoom_changed', function() {  
    document.getElementById('panel').innerHTML  = 'Zoom Changed';
    window.setTimeout(function() {  
      document.getElementById('panel').innerHTML = '';
    }, 2000);  
  });  
}  
  </script>  
  </head>  
  <body> 
    <div id="panel"></div>
    <div id="map"></div>  
  </body>  
</html>

Above example will produce following output