Google Maps API in Rails (YM4R-GM) – Part II: Usage
Environment: Rails 2.3.2, Windows Vista, SQLite3 development on a local box
Using the YM4R is pretty simple. Here’s what you need to do:
1 – In your controller you need to add the following lines:
@map = GMap.new("map_div") @map.control_init(:large_map => true,:map_type => true) @map.set_map_type_init(GMapType::G_HYBRID_MAP) @map.center_zoom_init([22,38],4) @map.overlay_init(GMarker.new([22,38],:title => "Title", :info_window => "This description<br/> can have <b>HTML</b> in it!"))
@map.center_zoom_init([22,38],4) – first parameter is latitude, second is longitude (it usually comes with a decimal point and can be negative, eg. -12.3456), third is the zoom level (0 – world view, 19 – highest possible).
@map.overlay_init is how you set up the markers. You can change a marker icon if you want, you can also put html (including links) in the :info_window. Info window is what you see when you click on the marker.
@map.set_map_type_init(GMapType::G_HYBRID_MAP) By default you can view the map in the NORMAL mode. If you want to run in HYBRID, you need to add this line.
<%= GMap.header %>
3 – In your action view add the following 2 lines to render the map:
<%= @map.to_html %> <%= @map.div(:width => 600, :height => 400) %>
A note on @map.to_html – some tutorials would suggest you add it to your layout, I think it’s not the correct way, because layout exists for the whole controller and you will usually want to define the @map only in particular actions (like show). So in all other cases you will get a mistake of an undefined variable.
That’s it. If you need additional instruction, you can get a lot from reading the extended tutorial on its Git page.
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