AngularJS promise

Question

AngularJS docs say:

$q promises are recognized by the templating engine in angular, which means that in templates you can treat promises attached to a scope as if they were the resulting values.

所以有人可以解释这个 fiddle不起作用的原因吗？不可能更改文本字段的值。但是分配保证$ http服务返回到作用域字段的 promise 就像是一种魅力。

Controller :

function MyController($scope, $q, $timeout) {
    this.getItem = function () {
        var deferred = $q.defer();
        deferred.resolve({
            title: 'Some title'
        });
        return deferred.promise;
    };

    $scope.item = this.getItem();
}

HTML:

<input type="text" ng-model="item.title">

Answer 1

您需要在promise对象上使用then()函数:

this.getItem().then(function(result) {
   $scope.item = result;
});

就您而言，我认为您不需要 promise 。 Angular的$ watch系统将处理所有事情。 Just return an object in your function, not a primitive type:

this.getItem = function () {
    var item = {};

    // do some async stuff
    $http.get(...).success(function(result) {
       item.title = result;
    });
    return item;
};

$scope.item = this.getItem();