handle json with query mobile

application_controller.rb

# someday: move to json response module?
  def json_response(options)
    logger.warn "JSON response: #{options}"
    render json: options
  end

  def json_callback(method, args = [])
    json_response({status: :window_callback, method: method, args: args})
  end

  def json_target_callback(method, args = [])
    json_response({status: :target_callback, method: method, args: args})
  end

  def json_error(message = '')
    # todo: automatically email me
    json_response({status: :error, message: message})
  end

  def json_ok(message = '')
    json_response({status: :ok, message: message})
  end

  def json_dialog_close
    json_callback(:close_dialog)
  end

global_events.js.coffee

# handle json response data
$(document).bind "pageload", ( e, data ) ->
  # page is already in dom here.  someday: prevent json pages form being added?
  console.log 'pageload', e, data

  if data.xhr.getResponseHeader('Content-Type').search(/application\/json/) != -1 #  "application/json; charset=utf-8"

    # remove bunk page from dom (for anti-caching reasons)
    data.page.remove()

    data.json = $.parseJSON(data.xhr.responseText)
    $(this).trigger('pageloadjson', data)

    data.deferred.reject(data.absUrl, data.options)
    return false

# someday: handle json form validation
$(document).bind "pageloadjson", (e, data) ->
  # todo: diable page chaching
  console.log(e, data)
  status = data.json.status
  switch status
    when 'window_callback' then window[data.json.method].apply(window, data.json.args)
#    when 'target_callback' then $(e.target)[data.json.method].apply($(e.target), data.json.args)
    when 'target_callback'
      $target = $("[href='#{data.dataUrl}']")
      $target[data.json.method].apply($target, data.json.args)
    # because of jqm pos, e.target is not set right.
    when 'ok' then p data.json.message
    else p "#{data.json.status} - #{data.json.message}"