angularjs – 创建更新ng模型的angular-js指令

HTML：

<input ng-twitter-typeahead type="text" ng-model="participant" data="exampleData" />
{{ participant }}

当我在打字机上选择一些东西时，我想要更新“参与者”的值。打字机本身工作正常，但我无法捕获所选值。以下是javascript：

var app = angular.module('myApp',[])
app.directive('ngTwitterTypeahead',function () {
  return {
    restrict: 'EA',scope: {
      data: '='
    },link: function ($scope,$element,$attrs) {
      $element.typeahead($scope.data);

      $element.bind('typeahead:selected',function(obj,datum) {        
         // I really don't know how to do this part
         // the variable 'datum' is what I want to be passed to ng-model
         // I tried things like:
            // Including the ngModelController and typing:
            // ngModel.$setViewValue(datum)
            // but that didn't work.
     }
  };
});

对于AngularJS，我显然缺少一些基本的东西。任何帮助将不胜感激！

编辑**

我找到了解决方案。我有时候无知

angular.module('siyfion.ngTypeahead',[])
  .directive('ngTypeahead',function () {
    return {
    restrict: 'C',scope: {
      datasets: '=',ngModel: '='
    },$attrs) {
      $element.typeahead($scope.datasets);      

      $element.bind('typeahead:selected',datum) {        
    $scope.$apply(function() {
     $scope.ngModel = datum;
    });
  })            
    }
  };
});