使用 AngularJS require 选项调用另一个指令

Using the AngularJS require option to call into another directive

我刚刚在这里阅读有关通过 require 选项从另一个指令访问一个指令的控制器的内容:

  http://jasonmore.net/angular-js-directives-difference-controller-link/

我认为指令可放置和仪表板声明 - 在两个不同的 div 上:

  <div class="wrapper wrapper-content animated fadeInRight">
<div class="row">        
    <div class="col-lg-12" data-droppable drop="handleDrop">
        <div id="dash" dashboard="dashboardOptions" class="dashboard-container"></div>
    </div>
</div>

但是我似乎无法让它工作。我下面的 dashboardCtrl 参数是 NULL。

在我的 droppable 指令中,我使用了 REQUIRE 选项:

  .directive('droppable', function () {
return {
    scope: {
        drop: '&',
    },
    //****************** dashboard directive is optionally requested ************
    require: '?dashboard', 

    link: function (scope, element, attributes, dashboardCtrl) {
         el.addEventListener('drop', function (e) {

            if (e.preventDefault) { e.preventDefault(); }

            this.classList.remove('over');
            var item = document.getElementById(e.dataTransfer.getData('Text'));                
            this.appendChild(item.cloneNode(true));

            // *** CALL INTO THE dashboardCtrl controller ***
            dashboardCtrl.addWidgetInternal();


            return false;
        }, false);
    }
}
});

和仪表板指令:

 angular.module('ui.dashboard')
.directive('dashboard', ['WidgetModel', 'WidgetDefCollection', '$modal', 'DashboardState', '$log', function (WidgetModel, WidgetDefCollection, $modal, DashboardState, $log) {
  return {
      restrict: 'A',
      templateUrl: function (element, attr) {
          return attr.templateUrl ? attr.templateUrl : 'app/shared/template/dashboard.html';
      },
      scope: true,      
      controller: ['$scope', '$attrs', function (scope, attrs) {
            // ommitted for brevity
        }],
      link: function (scope) {                
            scope.addWidgetInternal = function (event, widgetDef) {
              event.preventDefault();
              scope.addWidget(widgetDef);
          };
      };
   }
}]);

但是,我的 dashboardCtrl 参数是 NULL。请帮我弄清楚如何使用 require。

我实际上需要调用 link 选项中的 addWidget() 函数;但我想我可以将其复制或移动到控制器选项中。

谢谢! 鲍勃

这里是一个例子 "parent" 指令 dashboard 要求 droppable,两者之间的通信利用 require 并传递 dashboardCtrl

Here是一篇很好的文章,看directive to directive communication

Fiddle 示例也是根据您之前的问题构建的

JSFiddle

app.directive('droppable', [function () {
    return {
        restrict: 'A',
        require: 'dashboard',
        link: function (scope, elem, attrs, dashboardCtrl) {

            dashboardCtrl.controllerSpecificFunction('hello from child directive!');

            scope.addWidgetInternal = function(message) {
                console.log(message);
            }
        }
    }
}]);

app.directive('dashboard', [function () {
    return {
        restrict: 'A',
        controller: function ($scope) {
            $scope.handleDrop = function(message) {
                $scope.addWidgetInternal(message)
            }

            this.controllerSpecificFunction = function(message) {
                console.log(message);
           }
        }
    }
}]);


编辑

根据讨论,这是我目前理解的问题的解决方案

父指令dashboard可选地需要子指令droppable并且两者之间需要通信

<div dashboard>
    <button id="dash" droppable ng-click="handleDrop($event)">Handle Drop</button>
</div>


app.directive('droppable', [function () {
    return {
        restrict: 'A',
        require: '^?dashboard',
        link: function (scope, elem, attrs, dashboardCtrl) {
            scope.handleDrop = function($event) {
                dashboardCtrl.addWidgetInternal($event);
            }
        }
    }
}]);

app.directive('dashboard', [function () {
    return {
        restrict: 'A',
        controller: function ($scope) {
            this.addWidgetInternal = function($event) {
                console.log($event);
           }
        }
    }
}]);

Updated JSFiddle