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Editorial Team
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Asked: 2026-05-15T13:52:12+00:00

I’m building a website with ASP.NET MVC where one feature displays some points on

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I’m building a website with ASP.NET MVC where one feature displays some points on a Google map, using the Google Maps Javascript API. As I have a lot of points, I don’t want to fetch them all; rather, I want to get only the ones that are in the current view area that the user is looking at on the map (the bounding box).

To do that, I will make an AJAX request to my C# code that returns all the points inside a certain bounding box. However, I need to somehow create an event handler that catches whenever the map is panned or zoomed by the user.

How can I detect when a map using the Google Maps Javascript API is panned or zoomed and fire an event handler?

UPDATE: I know that I have to implement an event listener. Can someone point me towards a list of events that I can use for the Map object? click is one of those events, but what are the ones that relate to zooming and panning?

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1 Answer

  1. Editorial Team

    It looks like you’re looking for the idle event:

    This event is fired when the map becomes idle after panning or zooming.

    Example:

    <!DOCTYPE html>
<html> 
<head> 
  <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> 
  <title>Google Maps Events</title> 
  <script src="http://maps.google.com/maps/api/js?sensor=false" 
          type="text/javascript"></script>
</head> 
<body>
  <div id="map" style="width: 500px; height: 400px;"></div>

  <script type="text/javascript">
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 10,
      center: new google.maps.LatLng(-33.92, 151.25),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    google.maps.event.addListener(map, 'idle', function() {
      var bounds = map.getBounds();

      console.log('North East: ' +
                  bounds.getNorthEast().lat() + ' ' + 
                  bounds.getNorthEast().lng());

      console.log('South West: ' +
                  bounds.getSouthWest().lat() + ' ' + 
                  bounds.getSouthWest().lng());

      // Your AJAX code in here ...
    });
  </script>
</body>
</html>

    In addition, you can find the list of all events exported by the google.maps.Map object from the API Reference:

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