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    <p>Rails 3.1.x already returns JSON requests if you have a controller like this:</p> <pre><code>class EaracheMyEyeController &lt; ApplicationController def show @earache_my_eye = EaracheMyEye.find(params[:id]) respond_to do |format| format.html # show.html.erb format.json { render json: @earache_my_eye } end end end </code></pre> <p>The <code>format.json { render json: @earache_my_eye }</code> part will render the data as JSON if you visit the URL of the object, for example <code>earachemyeyes/1.json</code> </p> <p>So, in your phone gap app you would call URLS GET method to receive data and add on <code>.json</code> on the end of the url to receive JSON formatted data. </p> <p>Update:</p> <p>A few things I learned recently about JSONP requests in phonegap. They are <em>only</em> GET requests. No posts. </p> <p>However, you can append a <code>_method=POST</code>, and add <code>configure.middleware.swap(Rack::MethodOverride,Rack::RestfulJsonpMiddleware</code> to your conf/environments/(production/development/test).rb file(s) </p> <p>Add something like this to your library:</p> <p><a href="https://github.com/quickleft/kbomb_phonegap_server/blob/master/lib/rack/restful_jsonp_middleware.rb" rel="nofollow">https://github.com/quickleft/kbomb_phonegap_server/blob/master/lib/rack/restful_jsonp_middleware.rb</a></p> <p>This allows you to send an actual GET request, yet it is read and processed as your <code>_method=POST</code> or whatever method you really need. You can't use the built in Rack::MethodOverride because it only implements POST, and nothing else (was meant to facilitate PUT and GET). So the file at <a href="https://github.com/quickleft/kbomb_phonegap_server/blob/master/lib/rack/restful_jsonp_middleware.rb" rel="nofollow">https://github.com/quickleft/kbomb_phonegap_server/blob/master/lib/rack/restful_jsonp_middleware.rb</a> builds a new Rack middleware that lets you use all HTTP methods.</p>
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    1. POHow to write Rails code to handle request from client (JS) for Phonegap development
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    1. USSam Rose
    1. USSam Rose
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    1. COWhy is JSONP and the extra steps necessary and what is the difference form doing it the JSONP method and just rendering the JSON?
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      1. USPan Wangperawong
    2. COPan W try this post for an explanation http://stackoverflow.com/questions/3506208/jquery-ajax-cross-domain
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      1. USSam Rose
    3. COIf the application is wrapped in a library like phonegap, then JSONP is not required
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      1. USSam Rose
 

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