angularjs - 与兄弟指令沟通

Question

目标:使用指令创建行为，并在 2 个兄弟元素(每个元素都有自己的指令)之间进行通信。

示例中使用的行为:默认情况下隐藏文章内容。当点击标题时，我希望显示相关的文章内容。

问题:相关的文章元素需要相互关联，而不是嵌套在单个父元素或指令中。

<div article="article1">this is my header</div>
<div id="article1" article-content>this is content for the header above</div>

<div article="article2">this is my header</div>
<div id="article2" article-content>this is content for the header above</div>

我知道将内容放在article指令中会更容易，但是这个问题是为了找出如何解决这样的情况。

内容指令能否以某种方式将自身传递给相关的文章指令？

这段代码不像现在那么有用，但它是一个起点。我该如何实现这个目标？

.directive('article', function(){
  return {
    restrict: "A",
    controller: function($scope) {
      $scope.contentElement = null;
      this.setContentElement = function(element) {
        $scope.contentElement = element;
      }
    },
    link: function(scope, element) {
      element.bind('click', function(){
        // Show article-content directives that belong
        // to this instance (article1) of the directive
      }
    }
  }
}
.directive('articleContent', function(){
  return {
    require: "article",
    link: function(scope, element, attrs, articleCtrl) {
      // Maybe reference the article i belong to and assign element to it?
      // I can't though because these are siblings.
    }
  }
}

Answer 1

指令 require 选项都不允许您要求同级指令(据我所知)。您只能:

• 对元素进行 require，使用 require: "directiveName"
• 告诉 Angular 使用 require: "^directiveName"搜索 DOM 树
• 或require: "^?directiveName"(如果您不一定需要父 Controller )
• 或 require: "^\?directiveName" 如果您不一定需要父 DOM 包装器

如果您想要 sibling 之间的通信，则必须将它们放置在某个父 DOM 元素中，并使用指令 Controller 充当其通信的 API。如何实现在很大程度上取决于当前的上下文。

这是 Angular JS (O Reilly) 中的一个很好的例子

app.directive('accordion', function() {
  return {
    restrict: 'EA',
    replace: true,
    transclude: true,
    template: '<div class="accordion" ng-transclude></div>',
    controller: function() {

      var expanders = [];

      this.gotOpened = function(selectedExpander) {
        angular.forEach(expanders, function(expander) {
          if(selectedExpander != expander) {
            expander.showMe = false;
          }
        });
      };

      this.addExpander = function(expander) {
        expanders.push(expander);
      }

    }
  }
});

app.directive('expander', function() {
  return {
    restrict: 'EA',
    replace: true,
    transclude: true,
    require: '^?accordion',
    scope: { title:'@' },
    template: '<div class="expander">\n  <div class="title" ng-click="toggle()">{{ title }}</div>\n  <div class="body" ng-show="showMe" \n       ng-animate="{ show: \'animated flipInX\' }"\n ng-transclude></div>\n</div>',
    link: function(scope, element, attrs, accordionController) {
      scope.showMe = false;
      accordionController.addExpander(scope);

      scope.toggle = function toggle() {
        scope.showMe = !scope.showMe;
        accordionController.gotOpened(scope);
      }
    }
  }
})

用法( Jade 模板):

accordion
    expander(title="An expander") Woohoo! You can see mme
    expander(title="Hidden") I was hidden!
    expander(title="Stop Work") Seriously, I am going to stop working now.