Google Maps map.getBounds() immediately after a call to map.fitBounds

StackOverflow https://stackoverflow.com/questions/3506035

Question

I'm calling getBounds() directly after a call to fitBounds(), and I thought I'd get a valid bound back as the map recenters and zooms to fit the bounds. Unfortunately, getBounds() is returning nil.

The code to reproduce this is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml"> 
    <head> 
        <meta http-equiv="content-type" content="text/html; charset=utf-8"/> 
        <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>

        <style>
            #map {
                width: 800px;
                height: 400px;
            }
        </style>

    </head>
    <body>
        <div id='map'></div>

        <script>
            var myLatlng1 = new google.maps.LatLng(-38.397, 150.644);
            var myLatlng2 = new google.maps.LatLng(-34.897, 150.844);
            var myLatLngBounds = new google.maps.LatLngBounds(myLatlng1, myLatlng2);

            var myOptions = {
                  mapTypeId: google.maps.MapTypeId.ROADMAP,
                  center: new google.maps.LatLng(0, 0),
                  zoom: 0
            }

            var map = new google.maps.Map(document.getElementById("map"), myOptions);

            map.fitBounds(myLatLngBounds);

            console.log(map.getMapTypeId());
            console.log(map.getZoom());
            console.log(map.getBounds());
        </script>
    </body>
</html>

Is there something I'm missing? I haven't been able to find anything in the docs about this situation. The nearest I get is a note on getBounds that says:

If the map is not yet initialized (i.e. the mapType is still null), or center and zoom have not been set then the result is null.

Note that getZoom returns undefined, too. Does fitBounds() not set this value?

EDIT I've updated the code with a default zoom and center, as per Marcelo's suggestions.

Was it helpful?

Solution

You will have to get the bounds after the bounds_changed event.

OTHER TIPS

As @CrazyEnigma suggested, you can get the bounds after the bounds_changed event is triggered:

map.fitBounds(myLatLngBounds);

google.maps.event.addListener(map, 'bounds_changed', function() {
  console.log(map.getMapTypeId());
  console.log(map.getZoom());
  console.log(map.getBounds());
});

The above would print the following to your console:

roadmap
6
Object

Note that if you only want to getBounds and do something once, you should replace addListener with addListenerOnce (Thanks, @Tomas).

Use addListenerOnce when tilesloaded 

google.maps.event.addListenerOnce(map, 'tilesloaded', function(){ 
map.setCenter(myLatLngBounds)
});

The answer is in your own quote. You have to set the center and zoom for the map to be initialized.

Note that in the docs for the MapOptions object specification, the values of center and zoom are marked as required:

http://code.google.com/apis/maps/documentation/javascript/reference.html#MapOptions

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