在 Angular Bootstrap UI typeahead 中更新模型值

Question

我正在使用Angular Bootstrap UI typeahead 并尝试更新预输入中的模型值。但更新后的模型值不会反映更改，除非特别应用。

<input ng-model="query" typeahead="option for option in getOptions($viewValue)">

app.controller('MainCtrl', function($scope) {
  $scope.query = '';
  $scope.getOptions = function(query){
    if(query == "foo"){
      $scope.query = "foobar";
      // uncommenting the next line works but also raises error
      // $scope.$apply()
      return []
    }
    return ["I have an idea", "I have new idea"];
  }
});

Plunker 代码： http://plnkr.co/edit/pNxBMgeKYulLuk7DO0gB?p=preview

Answer 1

您可以通过查看$scope.query 的值来完成此操作。

在$watch中，newValue和oldValue分别代表$scope.query改变前后的值。

$scope.$watch("query", function(newValue, oldValue){
  if (newValue !== oldValue) {
    if (newValue === "foo") {
      $scope.query = "foobar";
    }
  }
});

http://plnkr.co/edit/Fsj8KWuSzr9VTMkKB9wO?p=preview