Autocomplete - multiple

Autocomplete source

["this","is","array","of","text"]
[{"id":1,"value":"One"},{"id":2,"value":"Two"},{"id":3,"value":"Three"},{"id":4,"value":"Four"}]

<div
  auto-complete-multi=""
  placeholder="Select One"
  xxxx-list-formatter="customListFormatter"
  prefill-func="prefillFunc('prefill2.json?ids='+foo_ids)"
  source="source"
  value-changed="callback(value)"> 
        
<select
  id="sp"
  ng-disabled="disabled"
  ng-model="foo">
</select>
        
<input
  type="hidden"
  name="foo_ids"
  ng-model="foo_ids">
      
</div>

$scope.foo: ["is"]
$scope.foo_ids: 1,2
$scope.source: [{"id":1,"value":"One"},{"id":2,"value":"Two"},{"id":3,"value":"Three"},{"id":4,"value":"Four"}]
$scope.selected =