Using setZoom() after using fitBounds() with Google Maps API V3
I'm using fitBounds() to set the zoom level on my map too include all the markers currently displayed. However, when I have only one marker visible, the zoom level is 100% (... which zoom level 20 I think...). However, I don't want it to be that far zoomed in so the user can adjust the position of the marker without having to zoom out.
I have the following code:
var marker = this.map.createMarker(view.latlng, this.markerNumber);
this.map.bounds.extend(view.latlng);
this.map.map.setCenter(this.map.bounds.getCenter());
this.map.map.fitBounds(this.map.bounds);
if (this.markerNumber === 1) {
this.map.map.setZoom(16);
}
this.markerNumber++;
where this.map.bounds was previously defined as:
this.map.bounds = new google.maps.LatLngBounds();
However, the problem I am having is that the line this.map.map.setZoom(16); doesn't work if I use this.map.map.fitBounds(this.map.bounds); , however, I know that line of code is correct because when I comment out the fitBound() line, the setZoom() magically starts functioning.
Any ideas how I resolve this? I'm thinking of setting a maxZoom level as an alternative if I can't get this working.
Alright, I've figured it out. Apparently, the fitbounds() happens asynchronously, so you have to wait for a bounds_changed event before setting zoom works.
map = this.map.map;
map.fitBounds(this.map.bounds);
zoomChangeBoundsListener =
google.maps.event.addListenerOnce(map, 'bounds_changed', function(event) {
if (this.getZoom()){
this.setZoom(16);
}
});
setTimeout(function(){google.maps.event.removeListener(zoomChangeBoundsListener)}, 2000);
Update : See @Nequin's answer using addListenerOnce for a better solution that doesn't require a timeout.
google.maps.event.addListenerOnce(yourMap, 'bounds_changed', function(event) {
if (this.getZoom() > 15) {
this.setZoom(15);
}
});
This solution works better… instead of waiting on timeout to remove listener. Call this directly before using fitBounds (I believe calling after will work as well).
I found the additional zoom to be a little jarring. If you set the maxZoom option before calling fitBounds (and then unset it in the callback) you can avoid it:
map.setOptions({
maxZoom: 10
});
map.setCenter(new google.maps.LatLng(-89, -179)); // make sure it changes so the idle listener gets called back
map.fitBounds(bounds);
var listener = google.maps.event.addListenerOnce(map, "idle", function()
{
map.setOptions({
maxZoom: 999
});
});
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