javascript - 在 Angular 中处理 Accordion 的打开/折叠事件

Question

如果我有这个代码：

<accordion-group heading="{{group.title}}" ng-repeat="group in groups">
      {{group.content}}
</accordion-group>

使用 AngularJS、angular-ui 和 Twitter Bootstrap，是否可以让手风琴在打开时调用一些动作？我知道我不能简单地添加ng-click，因为它在“编译”为 HTML 以打开/折叠组之后已经使用。

Answer 1

Accordion 组还允许使用 Accordion-heading 指令，而不是将其作为属性提供。您可以使用它，然后通过 ng-click 将标题包装在另一个标签中。

<accordion-group ng-repeat="group in groups" heading="{{group.title}}" is-open="group.open">
  <accordion-heading>
    <span ng-click="opened(group, $index)">{{group.content}}</span>
  </accordion-heading>
</accordion-group>

示例：http ://plnkr.co/edit/B3LC1X?p=preview

Answer 2

这是一个基于pkozlowski.opensource解决方案的解决方案。您可以使用动态定义的 Property
， 而不是在集合的每个项目上添加$watch。在这里，您可以将组的IsOpened属性绑定到is-open属性。

<accordion-group ng-repeat="group in groups" heading="{{group.title}}" is-open="group.IsOpened">
   {{group.content}}
</accordion-group>

因此，您可以在控制器中的集合的每个项目上动态添加IsOpened属性：

$scope.groups.forEach(function(item) {
  var isOpened = false;
  Object.defineProperty(item, "IsOpened", {
    get: function() {
      return isOpened;
    },
    set: function(newValue) {
      isOpened = newValue;
      if (isOpened) {
        console.log(item); // do something...
      }
    }
  });
});

使用属性而不是手表对性能更好。

Answer 3

is-open手风琴组上有指向可绑定表达式的属性。当给定的手风琴组打开时，您可以观察这个表达式并执行一些逻辑。使用此技术，您可以将标记更改为：

<accordion-group ng-repeat="group in groups" heading="{{group.title}}" is-open="group.open">
   {{group.content}}
</accordion-group>

这样您就可以在控制器中准备所需的监视表达式：

$scope.$watch('groups[0].open', function(isOpen){
    if (isOpen) {
      console.log('First group was opened'); 
    }    
  });

虽然上述工作在实践中使用可能有点麻烦，所以如果你觉得这可以改进，请在https://github.com/angular-ui/bootstrap中打开一个问题

Answer 4

我使用关联数组来创建打开状态和模型对象之间的关系。

HTML 是：

  <div ng-controller="CaseController as controller">


                <accordion close-others="controller.model.closeOthers">
                    <accordion-group ng-repeat="topic in controller.model.topics track by topic.id" is-open="controller.model.opened[topic.id]">
                       <accordion-heading>
                          <h4 class="panel-title clearfix" ng-click="controller.expand(topic)">
                         <span class="pull-left">{{topic.title}}</span>
                         <span class="pull-right">Updated: {{topic.updatedDate}}</span>
                          </h4>                           
                       </accordion-heading>
                  <div class="panel-body">

                      <div class="btn-group margin-top-10">
                          <button type="button" class="btn btn-default" ng-click="controller.createComment(topic)">Add Comment<i class="fa fa-plus"></i></button>
                      </div>
                     <div class="btn-group margin-top-10">
                         <button type="button" class="btn btn-default" ng-click="controller.editTopic(topic)">Edit Topic<i class="fa fa-pencil-square-o"></i></button>
                     </div>
                      <h4>Topic Description</h4>
                      <p><strong>{{topic.description}}</strong></p>
                      <ul class="list-group">
                          <li class="list-group-item" ng-repeat="comment in topic.comments track by comment.id">
                              <h5>Comment by: {{comment.author}}<span class="pull-right">Updated: <span class="commentDate">{{comment.updatedDate}}</span> | <span class="commentTime">{{comment.updatedTime}}</span></span></h5>
                              <p>{{comment.comment}}</p>
                             <div class="btn-group">
                               <button type="button" class="btn btn-default btn-xs" ng-click="controller.editComment(topic, comment)">Edit <i class="fa fa-pencil-square-o"></i></button>
                               <button type="button" class="btn btn-default btn-xs" ng-click="controller.deleteComment(comment)">Delete <i class="fa fa-trash-o"></i></button>
                             </div>
                          </li>
                      </ul>
                  </div>

                    </accordion-group>
                </accordion>

控制器片段是：

   self.model = {
      closeOthers : false,
      opened   : new Array(),
      topics   : undefined
   };

“主题”在 AJAX 调用中填充。将“打开”状态与从服务器更新的模型对象分离意味着状态在刷新时得以保留。

我还声明了控制器ng-controller="CaseController as controller"

Answer 5

这是一个受 kjv 回答启发的解决方案，它可以轻松跟踪哪个手风琴元素是打开的。我发现很难ng-click在手风琴标题上工作，尽管将元素包围在<span>标签中并添加 ng-click 效果很好。

我遇到的另一个问题是，虽然accordion元素是以编程方式添加到页面中的，但内容却没有。{{path}}当我尝试使用链接到变量的 Angular 指令（即）加载内容时，$scope我会遇到，因此使用了波纹管方法，该方法使用嵌入undefined的 ID 填充手风琴内容。div

控制器：

    //initialise the open state to false
    $scope.routeDescriptors[index].openState == false

    function opened(index) 
    {
        //we need to track what state the accordion is in
        if ($scope.routeDescriptors[index].openState == true){   //close an accordion
            $scope.routeDescriptors[index].openState == false
        } else {    //open an accordion
            //if the user clicks on another accordion element
            //then the open element will be closed, so this will handle it
            if (typeof $scope.previousAccordionIndex !== 'undefined') {
                $scope.routeDescriptors[$scope.previousAccordionIndex].openState = false;
            }
            $scope.previousAccordionIndex = index;
            $scope.routeDescriptors[index].openState = true;
    }

    function populateDiv(id)
    {
        for (var x = 0; x < $scope.routeDescriptors.length; x++)
        {
            $("#_x" + x).html($scope.routeDescriptors[x]);
        }
    }

HTML：

        <div ng-hide="hideDescriptions" class="ng-hide" id="accordionrouteinfo" ng-click="populateDiv()">
            <accordion>
                <accordion-group ng-repeat="path in routeDescriptors track by $index">
                    <accordion-heading>
                        <span ng-click="opened($index)">route {{$index}}</span>
                    </accordion-heading>
                    <!-- Notice these divs are given an ID which corresponds to it's index-->
                    <div id="_x{{$index}}"></div>
                </accordion-group>
            </accordion>
        </div>

Answer 6

手风琴控制器.js

MyApp.Controllers
    .controller('AccordionCtrl', ['$scope', function ($scope) {

        $scope.groups = [
            {
                title: "Dynamic Group Header - 1",
                content: "Dynamic Group Body - 1",
                open: false
            },
            {
                title: "Dynamic Group Header - 2",
                content: "Dynamic Group Body - 2",
                open: false

            },
            {
                title: "Dynamic Group Header - 3",
                content: "Dynamic Group Body - 3",
                open: false
            }
        ];

        /**
         * Open panel method
         * @param idx {Number} - Array index
         */
        $scope.openPanel = function (idx) {
            if (!$scope.groups[idx].open) {
                console.log("Opened group with idx: " + idx);
                $scope.groups[idx].open = true;
            }
        };

        /**
         * Close panel method
         * @param idx {Number} - Array index
         */
        $scope.closePanel = function (idx) {
            if ($scope.groups[idx].open) {
                console.log("Closed group with idx: " + idx);
                $scope.groups[idx].open = false;
            }
        };

    }]);

索引.html

<div ng-controller="AccordionCtrl">

    <accordion>

        <accordion-group ng-repeat="group in groups" is-open="group.open">
            <button ng-click="closePanel($index)">Close me</button>
            {{group.content}}
        </accordion-group>


        <button ng-click="openPanel(0)">Set 1</button>
        <button ng-click="openPanel(1)">Set 2</button>
        <button ng-click="openPanel(2)">Set 3</button>

    </accordion>
</div>

Answer 7

您可以使用 Angular 指令执行此操作：

html

<div uib-accordion-group is-open="property.display_detail" ng-repeat="property in properties">
  <div uib-accordion-heading ng-click="property.display_detail = ! property.display_detail">
    some heading text
  </div>
  <!-- here is the accordion body -->
  <div ng-init="i=$index">  <!-- I keep track of the index of ng-repeat -->
    <!-- and I call a custom directive -->
    <mydirective mydirective_model="properties" mydirective_index="{% verbatim ng %}{{ i }}{% endverbatim ng %}">
      here is the body
    </mydirective>
  </div>
</div>

js

app.directive("mydirective", function() {
  return {
    restrict: "EAC",  
    link: function(scope, element, attrs) {
      /* note that ng converts everything to camelCase */
      var model = attrs["mydirectiveModel"];
      var index = attrs["mydirectiveIndex"];
      var watched_name = model + "[" + index + "].display_detail"
      scope.$watch(watched_name, function(is_displayed) {
        if (is_displayed) {
          alert("you opened something");
        }
        else {
          alert("you closed something");
        }
      });
    }
  }
});

关于我的设置有一些特质（我使用 Django，因此使用“{% verbatim %}”标签），但该方法应该有效。