如何在ng-repeat中正确执行函数

Question

情况:

我正在AngularJs中创建一个分配权限的应用程序.为了做到这一点,我有三个嵌套的ng-repeat.

第一个循环:显示PERMISSION GROUP

第二个循环:为每个权限组显示CATEGORIES.在此循环内执行一个函数,该函数将获取每个类别的所有SUB CATEGORIES

第三个循环:显示SUB CATEGORIES

问题:

问题在于在第二个循环内执行函数.

ATTEMPT 1 - ng-init:

<div class="row" ng-repeat="permission_group in list_permission_groups">
  <div class="col-sm-3">
    <h3>
      {{permission_group.permission_group_name}} 
    </h3>
  </div>
  <div class="col-sm-9">
    <ul>
      <li ng-repeat="category in list_categories">
        <span>
          {{ category.name }} 
        </span>            
        <div class="checkbox">
          <label>                
            <div ng-init="temp_result = get_Sub_Categories(category.category_id)">                  
              <p ng-repeat="sub_category in temp_result">
                {{ sub_category.name }} 
              </p>                  
            </div>               
          </label>
        </div>           
      </li>
    </ul>
  </div>
</div>

在控制器中:

$scope.get_Sub_Categories = function(category_id) {
    $http({

        url: base_url + 'main/json_get_list_sub_categories',
        data: {
            category_id: category_id
        },
        method: "POST"

    }).success(function(data) {

        return data;

    });

}

这种行为很奇怪.可能由于脏检查,页面加载了682次.没有显示结果.

ATTEMPT 2 - ng-click :(仅用于调试)

<div class="row" ng-repeat="permission_group in list_permission_groups">

  <div class="col-sm-3">

    <h3>
      {{permission_group.permission_group_name}} 
    </h3>

  </div>

  <div class="col-sm-9">
    <ul>
      <li ng-repeat="category in list_categories">
        <span>
          {{ category.name }} 
        </span>

        <div class="checkbox">
          <label>

            <button ng-click="get_Sub_Categories(category.category_id)">
              GET SUB-CATEGORIES
            </button>

            {{ list_sub_categories }} 

          </label>
        </div>

      </li>
    </ul>
  </div>
</div>

在控制器中:

$scope.get_Sub_Categories = function(category_id) {
    $http({

        url: base_url + 'main/json_get_list_sub_categories',
        data: {
            category_id: category_id
        },
        method: "POST"

    }).success(function(data) {

        $scope.list_sub_categories = data;

    });

}

这次页面只加载一次.如果我按下按钮,则会显示正确的子类别,但当然不仅仅是相应的类别而是FOR ALL,因为我正在修改全局范围中的var.

目的:

我想要获得的只是显示每个类别的所有适当的子类别.不使用按钮,只需在页面加载后立即查看所有正确的内容.但我不明白如何在AngularJs中正确完成.

问题:

如何在ng-repeat中正确执行一个返回并显示每个循环的不同数据的函数？

编辑 - 一个类别的子类别示例的转储:

[{
    "sub_category_id": "1",
    "name": "SUB_CATEGORY_1",
    "category_id_parent": "1",
    "status": "VISIBLE"
}, {
    "sub_category_id": "2",
    "name": "SUB_CATEGORY_2",
    "category_id_parent": "1",
    "status": "VISIBLE"
}, {
    "sub_category_id": "3",
    "name": "SUB_CATEGORY_3",
    "category_id_parent": "1",
    "status": "VISIBLE"
}, {
    "sub_category_id": "4",
    "name": "SUB_CATEGORY_4",
    "category_id_parent": "1",
    "status": "VISIBLE"
}]

Answer 1

在ng-repeat中调用函数与普通函数相同.由于您需要在页面加载时显示子类别,因此最好事先获取这些数据.异步加载子类别将不适合此方案.

这是实现此目的的最小片段(JS小提琴)

<div ng-app="app" ng-controller="ctrl">
    <div ng-repeat="category in model.categories"> <span> Category: {{ category.name }} </span>

      <p ng-repeat="subCategory in getSubCategories(category.Id)">{{ subCategory.name }}</p>
   </div>
</div>

调节器

angular.module("app", [])
.controller('ctrl', ['$scope', function ($scope) {
$scope.model = {
    categories: [{
        "Id": 1,
        name: '1'
    }, {
        "Id": 2,
        name: '2'
    }],
    subCategories: [{
        "parentId": 1,
        name: 'a1'
    }, {
        "parentId": 1,
        name: 'a2'
    },
                   {
        "parentId": 2,
        name: 'a3'
    }]
}
$scope.getSubCategories = function(parentId){
    var result = [];
    for(var i = 0 ; i < $scope.model.subCategories.length ; i++){
        if(parentId === $scope.model.subCategories[i].parentId){
            result.push($scope.model.subCategories[i]);               
        }
    }
    console.log(parentId)
    return result;
}}])

Answer 2

子类别示例对我的情况不起作用,并且由于某种原因我的代码进入了infinte循环.可能是因为我使用的是手风琴.

我使用ng-init在ng-repeat中实现了这个函数调用

<td class="lectureClass" ng-repeat="s in sessions" ng-init='presenters=getPresenters(s.id)'>
      {{s.name}}
      <div class="presenterClass" ng-repeat="p in presenters">
          {{p.name}}
      </div>
</td> 

控制器端的代码应如下所示

$scope.getPresenters = function(id) {
    return SessionPresenters.get({id: id});
};

虽然API工厂如下:

angular.module('tryme3App').factory('SessionPresenters', function ($resource, DateUtils) {

        return $resource('api/session.Presenters/:id', {}, {
            'query': { method: 'GET', isArray: true},
            'get': {
                method: 'GET', isArray: true
            },
            'update': { method:'PUT' }
        });
    });