global.js.coffee

  window.auto_complete = (field,url, updated_field, callback) ->
    labels = null
    mapped = null
    $(field).typeahead
      source: (query, process)->
        $.get(url, { q: query }, (data) ->
          labels = []
          mapped = {}
          
          mapitem = (item)->
            mapped[item.label] = item.value
            labels.push(item.label)
          
          mapitem(item) for item in data

          process(labels)
          )
      updater: (item)->
        id_field = $(updated_field)
        id_field.val(mapped[item])
        callback(id)
        console.log(id_field.val())
        return item
      items: 5

intakes.js.coffee

  auto_complete('#select_intake_contact_name'
    '/contacts/list.json'
    '#select_intake_contact_id'
    (id)->
      $('#select_intake_submit')
        .removeAttr('disabled')
        .attr('href', '/contacts/' + id + '/new_intake'))