如何在angularjs的指令中推迟方法执行 [英] how to defer a method execution in a directive in angularjs

问题描述

我正在编写一个指令，它接收一个函数作为参数，该指令执行并运行函数中包含的任何内容.

I'm writing a directive which recives a function as a parameter, the directive executes and run whatever is contained into the function.

用例是:

• 指令包含一个链接
• 当用户单击链接时，将执行作为参数(来自控制器)传递的方法
• 当用户点击点击按钮时，会显示一个微调器
• 方法执行完成后，微调器将隐藏

我的问题是如何推迟执行并将其绑定到承诺，以在方法执行后隐藏微调器.

my question is how can I defer the execution and bind it to a promise, to hide the spinner after the method execution.

出于说明目的，我使用了从 3 到 1 计数的 $timeout，请查看我迄今为止所做的代码:

for illustration purposes I have used $timeout that counts from 3 to 1, please take a look to the code I've done so far:

app.directive('toogleTextLink', function($compile,$q) {
    return {
        restrict: 'AE',
        scope: { callback: "&targetMethod" },
        template: '<div><a style="cursor: pointer" ><b>{{text}}</b></a>show value= {{show}}  <br/><div ng-class="{previewLoader: show}"></div></div>',
        link: function (scope, element, attr) {
            scope.value = attr.value;
            scope.show = false;
            scope.$watch('value', function () {
                    if (scope.value) {
                        scope.text = "yes";
                    } else {
                        scope.text = "no";
                    }
            });
            element.bind('click', function () {
                scope.show = true;
                scope.value = !scope.value;
                scope.$digest();
                if (scope.callback) {
                    var deferred = $q.defer(scope.callback());
                    deferred.promise.then(function () {
                        scope.show = false;
                        console.log("then called");
                    });

                }

            });
        }
    };
});

  app.controller('myCtrl', function($scope,$timeout,$q) {
  $scope.IsFacebookConnected = false;
  $scope.countDown = 3;
  $scope.authSocial = function(value, socialNetwork) {
        switch (socialNetwork) {
            case "facebook":
                $scope.IsFacebookConnected = !value;
        }

         runCounter = function() {
             $scope.countDown -= 1;            
            if ( $scope.countDown > 0)        
                $timeout(runCounter, 1000); 
                console.log("timer");
        };
        runCounter();
    };

});

这也是 plunker.

推荐答案

Andy Joslin 编写了一个承诺跟踪器"，它完全符合您的需求.它甚至还有一些用于 $http 集成的糖.基本上你向它添加承诺"，它会告诉你执行状态.然后，您可以将该执行状态绑定到 ng-show 上的诸如加载微调动画之类的东西.https://github.com/ajoslin/angular-promise-tracker 这是一个演示: http://plnkr.co/edit/3uAe0NdXLz1lCYlhpaMp?p=preview

Andy Joslin wrote a "promise tracker" which does exactly what you need. It even has some sugar for $http integration. Basically you add "promises" to it, and it tells you the execution state. You can then bind that execution state to ng-show on something like a loading spinner animation. https://github.com/ajoslin/angular-promise-tracker and here's a demo: http://plnkr.co/edit/3uAe0NdXLz1lCYlhpaMp?p=preview

您的代码将类似于:

$scope.tracker = promiseTracker("socialtracker");
$scope.tracker.addPromise(somePromise);

在您看来:

<div ng-show="tracker.active()">Loading...</div>

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