AngularJS:丢失了指令的范围 [英] AngularJS : Directive transcluded scope lost

问题描述

我正在构建指令，我称其为需要授权"以包装ng-if指令.我想按以下方式使用它:

I’m building a directive, I’m calling ‘requires-authorization’ to wrap an ng-if directive. I’d like to use it as follows:

<requires-authorization role='SuperUser'>
<!— super secret user stuff goes here, within
   the scope of this view's controller —>
</requires-authorization>

我已经做到了:

angular.module('myApp').directive('requiresAuthorization', function() {
   return {
    template: '<div ng-if=\'iAmInRole\' ng-transclude></div>',
    restrict: 'E',
    transclude: true,
    scope: {
        role: '@'
    },
    controller: function($scope, UserService) {
       $scope.iAmInRole = (UsersService.myRoles.indexOf($scope.role) !== -1);
    }
  };
});

这有效，但是指令中包含的内容失去了作用域，特别是在其中找到的视图的控制器的作用域.我忽略了什么?

This works, but the content contained within the directive loses its scope, specifically the scope of the controller of the view it's found within. What am I overlooking?

jsfiddle供参考: http://jsfiddle.net/HbAmG/8/ 请注意，auth值如何不在指令内部显示，而是在指令外部可用.

jsfiddle for reference: http://jsfiddle.net/HbAmG/8/ Notice how the auth value isn't displayed inside the directive, but is available outside directive.

推荐答案

ng-if和ng-transclude指令均在指令中执行包含.在这种情况下，内置的transclude机制无法正常工作，您应该实现自己的ngIf以使其按预期工作:

Both ng-if and ng-transclude directives perform transclusion in your directive. In this case build-in transclude mechanism does not work fine and you should implement ngIf of yourself to make it work as expected:

JavaScript

app.directive('requiresAuthorization', function () {
    return {
        template: '<div ng-transclude></div>',
        restrict: 'E',
        transclude: true,
        scope: {
            role: '@'
        },
        controller: function ($scope) {
            $scope.iAmInRole = true;
        },
        link: function(scope, element, attr, ctrl, transcludeFn) {
            transcludeFn(function(clone) { // <= override default transclude
                element.empty();
                if(scope.iAmInRole) { // <= implement ngIf by yourself
                  element.append(clone);
                }
            });
        }
    };
});

柱塞: http://plnkr.co/edit/lNIPoJg786O0gVOoro4z?p=preview

如果您可以使用ng-show而不是ng-if来进行选择，那么它也可能是一个非常简单的解决方法.唯一的副作用是隐藏的数据将在DOM中显示并使用CSS .ng-hide {display: none !important;}隐藏.

If ng-show is an option for you to use instead of ng-if it may be a very simple workaround as well. The only side effect is that hidden data will be presented in the DOM and hidden using CSS .ng-hide {display: none !important;}.

JSFiddle: http://jsfiddle.net/WfgXH/3/

JSFiddle: http://jsfiddle.net/WfgXH/3/

由于该帖子描述了类似的问题，因此它也可能对您有用: https://stackoverflow.com/a/22886515/1580941

This post may also be useful for you since it describes the similar issue: https://stackoverflow.com/a/22886515/1580941

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