如何在AngularJS服务中使用AngularJS指令?

方法是使用 $rootScope/$scope event 公交车:

 app.service("dataService", function($rootScope, $http) {
     this.get = function() {
         $rootScope.$broadcast("dataService.Start");
         return $http.get(url).finally(function() {
             $rootScope.$broadcast("dataService.Done");
         });
     };
 })

在指令中:

 app.directive("spinner", function() {
     return {
         link: postLink,
     };
     function postLink(scope, elem, attrs) {
         scope.$on("dataService.Start", function (event) {
             elem[0].startSpinner();
         });
         scope.$on("dataService.Done", function (event) {
             elem[0].stopSpinner();
         });
     }
});

有关更多信息,请参阅 AngularJS Developer Guide - Scope Event Propagation

angular-spinner 然后在索引中包含文件。html 并将dependencie添加到应用程序:

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

然后,您可以使用自定义指令拦截所有http请求,而无需在每个http调用之前添加start,并在之后添加stop(代码更少)

app.directive('usSpinner', ['$http', '$rootScope', function ($http, $rootScope) {
  return {
    link: function (scope, elm, attrs) {
      $rootScope.spinnerActive = false;
      scope.isLoading = function () {
        return $http.pendingRequests.length > 0;
      };

      scope.$watch(scope.isLoading, function (loading) {
        $rootScope.spinnerActive = loading;
        if (loading) {
          elm.removeClass('ng-hide');
        } else {
          elm.addClass('ng-hide');
        }
      });
    }
  };

}

然后在html中将以下内容添加到正文:

<span us-spinner></span>