data = [
  {
    name "Bob",
    age: 21
  },
  {
    name: "Steve",
    age: 25
  }
]
options = {
  inputMap: function(item){
    return item.name + ', ' + item.age
  }
}

var data = function(term, callback){
  hx.json('path/to/data?search='+term, function (e, r) {
    callback(r.responseText)
  })
}

function data (term, callback) {
  if (term.length > 0) {
    return callback(townAndCountyData.filter(function (d) {
      var d = townAndCountyData[_i]
      var name = d.name.toLowerCase()
      var term = term.toLowerCase()
      var county = d.county.toLowerCase()
      return name.indexOf(term) > -1 || county.indexOf(term) > -1)
    }))
  } else {
    return callback([])
  }
}

options.matchType = 'external'