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JSONP with Rails

I'm trying to retrieve JSON data from a remote site with Rails/Prototype.

I've found that there's a branch of Prototype that has an Ajax.JSONRequest() function. I can't get this to work.

jQuery has a $.getJSON() function, but I'm using some Prototype functions and I'd rather not switch to jQuery or use no conflict mode.

What am I missing? It seems like this would be easily done with Rails or Prototype.

Solution

  • Do you need to use Rails helpers to make the client request JSON? It's easy with Prototype 

    new Ajax.Request('/some_url', {
  method: 'get',
  onSuccess: function(transport) {
    var json = transport.responseText.evalJSON();
  }
});

    You just need to make sure that /some_url responds with JSON to an XHTTPRequest (preferably using respond_to?, but you can also check request.xhr?), using Rails' Object#to_json method.