处理AngularJS Services中的数据绑定

Question

我正试图找出当我的数据存储在服务中时如何正确处理绑定.

如果它将服务放入$ scope,然后让模板直接绑定到它,我可以使事情有效,但这似乎是一个非常糟糕的主意.

我基本上喜欢这样,以便我的视图/控制器能够轻松地改变服务中的状态,并在任何地方反映出来.

感觉我应该能够执行以下操作,但它不起作用(http://jsfiddle.net/aidankane/AtRVD/1/).

HTML

<div ng-controller="MyCtl">
    <select ng-model="drawing" ng-options="d.file for d in drawings"></select>
</div>
<div ng-controller="MyOtherCtl">
    {{ drawing }}
</div>

JS

var myApp = angular.module('myApp', []);

myApp.factory('myService', function(){
    var me = {
        drawings: [{'file':'a'}, {'file':'b'}]
    };
    // selected drawing
    me.drawing = me.drawings[0];
    return me;
});

function MyCtl($scope, myService){
    // can do:
    // $scope.mys = myService;
    // and then in html ng-model="mys.drawing"
    // but that seems wrong

    $scope.drawings = myService.drawings;
    $scope.drawing = myService.drawing;

    // can I not do this? it doesn't seem to work anyway...
    $scope.$watch('drawing', function(drawing){
        myService.drawing = drawing;
    });
}

function MyOtherCtl($scope, myService){
    $scope.drawing = myService.drawing;
}

MyCtl.$inject = ['$scope', 'myService'];
MyOtherCtl.$inject = ['$scope', 'myService'];

Answer 1

您可以使用$watch和传递函数绑定到服务:

$scope.$watch( function () { return myService.drawing; }, function ( drawing ) {
  // handle it here. e.g.:
  $scope.drawing = drawing;
});

然后$scope.drawing在您的模板中使用它们将自动更新:

<div ng-controller="MyOtherCtl">
  {{ drawing }}
</div>