Adjust Zoom Gmaps4Rails

Gmaps4rails V2 - change default zoom

remove:

handler.fitMapToBounds();

Replace with:

handler.getMap().setZoom(yourValue);

Adjust Zoom Gmaps4Rails

You're simply missing that seeing the whole map means providing a very small number, not a big one!

<%= gmaps({
  "map_options" => {"auto_adjust" => false, "zoom" => 0 },
  "markers"     => {"data" => @json }
 })
%>

Zoom bar disfigured in Google-Maps-for-Rails (gmaps4rails)

Add this to your css... there you will also have an issue with the terrain and overlays dropdowns...

#mapCanvas label { width: auto; display:inline; }
#mapCanvas img { max-width: none; }

Changing zoom causes all hidden markers to re-appear on Google Map (Gmaps4rails)

Basically, when you use a clusterer, it stores all markers.

• When you zoom out, it sets their map to null and adds cluster pics.

• When you zoom in, it removes the cluster pic and sets the map again in the markers.

So when you do marker.setMap(null), it's not enough: you have to remove the markers from the clusterer too!

_.each markers, (marker, i) ->
  marker.setMap(null)
  handler.clusterer.removeMarker(marker)

But I also needed this scenario, so just do:

_.each markers, (marker, i) ->
  handler.removeMarker(marker)

Or even:

handler.removeMarkers(markers)

gmaps4rails single marker auto zoom

Ok, the interface changed a lot since I posted the answer you quote.

<%= gmaps("markers" => {"data" => @json, "options" => {"auto_zoom" => false} }) %>

<% content_for :scripts do %>
    <script type="text/javascript" charset="utf-8">
      Gmaps.map.callback = function() {
        if (Gmaps.map.markers.length == 1) {
         //only one marker, choose the zoom level you expect
         setTimeout(function() { Gmaps.map.serviceObject.setZoom(5);}, 50);
        }
        else{
         //more than one marker, let's auto_zoom
         Gmaps.map.map_options.auto_zoom = true;
         Gmaps.map.adjustMapToBounds();
        }
      }
    </script>
<% end %>

Google Maps, Ruby on Rails, Zoom level with one marker

This behavior is due to the auto_zoom built-in function in the google maps api.

One work around to this is to set it to false in the gmaps method:

<%= gmaps({
       "map_options" => { "auto_zoom" => false},
       "markers"     => { "data" => @json }
      })
%>

And then use the gmaps4rails_callback to fit your needs (be sure to have at least version 0.7.9)

<script type="text/javascript" charset="utf-8">
  function gmaps4rails_callback() {
    if (Gmaps4Rails.markers.length == 1) {
     //only one marker, choose the zoom level you expect
     Gmaps4Rails.map.setZoom(2);
    }
    else{
     //more than one marker, let's auto_zoom
     Gmaps4Rails.map_options.auto_zoom = true;
     Gmaps4Rails.adjust_map_to_bounds();
    }
  }
</script>

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