JSONP

Jeroen Bulters wo 12 okt 11

Unfortunately, by default there is no JSONP mime type defined in Railsusage of the JSONP mime type defined in the documentation of Rails. So you’re left a bit in the void on that part. I thought Rails was a one stop solution.…

Luckily, the solution is easy:

class ApplicationController < ActionController::Base
  protected
  def render_json(json, options={})
    callback, variable = params[:callback], params[:variable]
    response = if callback && variable
                   "var #{variable} = #{json};\n#{callback}(#{variable});"
                 elsif variable
                   "var #{variable} = #{json};"
                 elsif callback
                   "#{callback}(#{json});"
                 else
                   json
                 end
               end
    render({:content_t ype => :js, :text => response}.merge(options))
  end
end

And you’re able to render your jsonp replies by calling:

format.js {
    # do your thang 
    render_json result.to_json
}

Still, it’s a shame you have to hack this in yourself.

As Jan de Poorter rightfully noted: The functionality is available; just poorly documented. My lesson here is to check the Rails source more often.

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