与兄弟指令通信 [英] Communicating with sibling directives

问题描述

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.

Goal: Create behaviors using directives with communication between 2 sibling elements (each their own directive).

示例中使用的行为:文章内容默认隐藏.单击标题时，我希望显示相关文章内容.

A behavior to use in example: The article content is hidden by default. When the title is clicked, I want the related article content to display.

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.

The catch: The related article elements need to associate to each other without being nested in a single parent element or directive.

<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>

我知道将内容放在文章指令中会更容易，但是这个问题是要找出如何解决这样的情况.

I know it would be easier to place the content inside the article directive, however this question is to find out how to solve a situation like this.

内容指令能否以某种方式将自身传递给相关的文章指令?

Can the content directive pass itself to the related article directive somehow?

这段代码不像现在那么有用，但它是一个起点.我将如何做到这一点?

This code isn't very useful as it is now, but it's a starting point. How would I accomplish this?

.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.
    }
  }
}

推荐答案

没有一个指令 require 允许你要求兄弟指令(据我所知).您只能:

None of the directive require options will allow you to require sibling directives (as far as I know). You can only:

• 在元素上需要，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控制器
• 或 require: "^\?directiveName" 如果您不一定需要父 DOM 包装器

• require on the element, using require: "directiveName"
• tell angular to search up the DOM tree using require: "^directiveName"
• or require: "^?directiveName" if you don't necessarily need the parent controller
• or require: "^\?directiveName" if you don't necessarily need the parent DOM wrapper

如果你想要兄弟之间的通信，你必须将它们放在一些父 DOM 元素中，并使用一个指令控制器作为它们通信的 API.如何实现在很大程度上取决于手头的上下文.

If you want sibling to sibling communication, you'll have to house them in some parent DOM element with a directive controller acting as an API for their communication. How this is implemented is largely dependent on the context at hand.

这是 Angular JS (O Reilly)

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(玉石模板):

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.

这篇关于与兄弟指令通信的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！