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copied!<p>Here is how I did it, I only replace the markers after the user finishes panning or zooming, if you require different behavior then use a different event listener:</p> <p>In your view (index.html.erb):</p> <pre><code><%= gmaps({ "map_options" => { "zoom" => 15, "auto_adjust" => false, "detect_location" => true, "center_on_user" => true }}, false, true) %> </code></pre> <p>At the bottom of your view add:</p> <pre><code><script type="text/javascript" charset="utf-8"> function gmaps4rails_callback() { google.maps.event.addListener(Gmaps4Rails.map, 'idle', function () { var bounds = Gmaps4Rails.map.getBounds(); drawItems(bounds); }); } </script> </code></pre> <p>In application.js (using jQuery):</p> <pre><code>function drawItems(theBounds) { var url = '/venues.json/?sw_y=' + theBounds.getSouthWest().lng() + '&sw_x=' + theBounds.getSouthWest().lat() + '&ne_y=' + theBounds.getNorthEast().lng() + '&ne_x=' + theBounds.getNorthEast().lat(); $.get(url, function(newItemData) { Gmaps4Rails.replace_markers(newItemData); }); } </code></pre> <p>venues_controller#index: </p> <pre><code>def index # Only pull venues within the visible bounds of the map if (params[:sw_y] && params[:sw_x] && params[:ne_y] && params[:ne_x]) bounds = [ [params[:sw_x].to_f, params[:sw_y].to_f], [params[:ne_x].to_f, params[:ne_y].to_f] ] @venues_within_bounds = Venue.within_bounds(bounds) else @venues_within_bounds = Venue.all end respond_to do |format| format.html # index.html.erb format.json { @data = @venues_within_bounds.collect {|v| { :longitude => v.longitude, :latitude => v.latitude, :picture => v.marker_picture, :title => v.marker_title } render :json => @data } end end </code></pre> <p>Venue.rb model (using mongodb and mongoid):</p> <pre><code>def self.within_bounds(bounds) self.where(:location.within => {"$box" => bounds }) end </code></pre>

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