app/views/shared/_map_scripts.html.erb
<% content_for :scripts do %>
<script src="https://maps.google.com/maps/api/js?v=3&libraries=geometry<%= gmap_key_value_for_url %>" type="text/javascript"></script>
<%= javascript_include_tag 'maps' %>
<% end %>
<% content_for :map do %>
<%= content_tag "div", "",
id: "marker_data",
data: {
zoom: @map_zoom_level,
latitude: Setting.latitude,
longitude: Setting.longitude,
geojson_url1: Setting.geojson_url1,
geojson_url2: Setting.geojson_url2,
pcn_overlay: @pcn_overlay,
markers: markers
} %>
<% end %>