<div>
    <button ng-if="items.length > 0">Select</button>
    <button ng-if="items.length <= 0" disabled>Select</button>
    <ul ng-repeat="i in items">
      <li>{{i.name}}</li>
    </ul>
 </div>

$scope.items = [{
  "id": 1,
  "name": "item1"
},
{
  "id": 2,
  "name": "item2"
}]