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Dynamic (or Ajax) map refresh
Gmaps4rails allows you to update your map on the fly.
Check here the valid json format you should provide: https://github.com/apneadiving/Google-Maps-for-Rails/wiki/Control-what-I-display
You should at least initialize a map. The minimum you could do is <%= gmaps({}) %>
If you want to replace the current markers with your new ones:
Gmaps4Rails.replace_markers(your_markers_json_string); //this is a JS function
If you want to add markers to those already displayed (it doesn't check duplicates):
Gmaps4Rails.add_markers(your_markers_json_string); //this is a JS function
You can generate javascript to update your map the same way it's used to create it. Simply use the to_gmaps4rails method after your hash of variables to display as described here: https://github.com/apneadiving/Google-Maps-for-Rails/wiki/Methods
Notice that you can use all javascript functions written in gmaps4rails.js directly. I hope the file has enough comments to make everything clear.