angularjs - angular.js 在回调中触发 ng-show

Question

我试图通过在 setTimeout 函数中编辑范围来触发 ng-show。 setTimeout 是数据库查询回调的占位符。

索引.html:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>

<script src="script.js"></script>

<div ng-controller="c1">

    <div ng-show="{{show}}"  >

        test it

    </div>

</div>

脚本.js:

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

amTestNgShow.controller('c1', ['$scope', function($scope) {

    // this works: $scope.show = true;

    setTimeout(function(){

        $scope.show = true; // works not

        // does not help: $scope.$apply();

    }, 1000)

}]);

这在 setTimeout 内如何实现？谢谢!

http://plnkr.co/edit/RPS2vZAlVfhliQKteSSK

更新:如上所述， setTimeout 不是问题，它仅用于生成可重现的 stackoverflow 问题。在我的项目中，我构建了一个服务:

amProject1.service('asBasic', ['$http', '$q', function($http, $q){

    var asBasic = {};

    asBasic.docName = '';

    var doc = {};

    asBasic.get = function(id){

        var deferred = $q.defer();

        $http({method:'GET', url: '/' + this.docName + '/' + id})
            .success(function(data, status, headers, config){

                if(data === undefined){

                    deferred.reject("The requested " + asBasic.docName + " was not found.")

                }

                doc = data;
                deferred.resolve(doc);

            })
            .error(function(data, status, headers, config){

                deferred.reject(status);

            })

       return deferred.promise;

    }


    return asBasic;

}]);

像使用它一样

amProject1.controller('acDoc1', ['$scope', '$routeParams', 'asBasic', function($scope, $routeParams, asBasic){

    asBasic.docName = 'doc1';

    // this works: $scope.show = true;

    asBasic.get($routeParams._id)
        .then(function(data){

            $scope.doc1 = data;

            $scope.show = true; // works not

            // does not help: $scope.$apply();

            // ...

        }
        // ...

Answer 1

这是因为 setTimeout 在 $scope 之外。过程。注入(inject)使用$timeout反而。

http://docs.angularjs.org/api/ng/service/$timeout

例如:

amTestNgShow.controller('c1', ['$scope', '$timeout', function($scope, $timeout) {
    $timeout(function(){
        $scope.show = true;
    }, 1000);
}]);

如果您确实想改用 $scope.apply ，我认为您只是使用错误。您不调用 $scope.apply()在您的范围编辑之后，您将它们放在 apply 函数中:

$scope.apply(function(){
    $scope.show = true;
});