在angular2中的onchange函数上构建一个反应式迭代形式？

Question

我有选择框，取决于我需要显示数组项的选定选项

静态地我有一个数组，取决于我根据我的要求建立反应形式的选择

静态数组，如

  form_objects = [  

 {  
     "id":1,
     "legend":"businessModule",
     "group":[  

          {  
              "id":1,
              "permission":{  
                 "controleType":"ff",
                 "id":2,
                 "key":"create Business",
                  "legend":"businessModule",
                  "label": "create Business"
              },
              "roles":[  
                 {  
                    "id":1,
                    "name":"self"
                 },
                 {  
                    "id":2,
                    "name":"other"
                 }
              ]
           },


          {  
              "id":1,
              "permission":{  
                 "controleType":"ff",
                 "id":2,
                  "legend":"businessModule",
                 "key":"edit business",
                 "label": "edit business"
              },
              "roles":[  
                 {  
                    "id":1,
                    "name":"self"
                 },
                 {  
                    "id":2,
                    "name":"other"
                 }
              ]
           }

     ]
  },


 {  
     "id":2,
     "legend":"PanicModule",
     "group":[  

          {  
              "id":1,
              "permission":{  
                 "controleType":"ff",
                 "id":2,
                  "legend":"PanicModule",
                 "key":"create panic",
                  "label": "create panic"
              },
              "roles":[  
                 {  
                    "id":1,
                    "name":"self"
                 },
                 {  
                    "id":2,
                    "name":"other"
                 }
              ]
           },


          {  
              "id":1,
              "permission":{  
                 "controleType":"ff",
                 "id":2,
                  "legend":"PanicModule",
                 "key":"edit panic",
                  "label": "edit panic"
              },
              "roles":[  
                 {  
                    "id":1,
                    "name":"self"
                 },
                 {  
                    "id":2,
                    "name":"other"
                 }
              ]
           }

     ]
  }

我想像这样建立一个可重复的数组

 {  
   "roleName":"",
   "roleDescription":"",
   "permissionModules":"PanicModule",
   "permission":[  
      {  
         "id":2,
         "key":"create Business",
         "legend":"businessModule",
         "ischecked":null,
         "label":"create Business",
         "roles":[  
            {  
               "id":1,
               "name":"self"
            },
            {  
               "id":2,
               "name":"other"
            }
         ]
      },
      {  
         "id":2,
         "key":"edit business",
         "legend":"businessModule",
         "ischecked":null,
         "label":"edit business",
         "roles":[  
            {  
               "id":1,
               "name":"self"
            },
            {  
               "id":2,
               "name":"other"
            }
         ]
      }
   ]
}

我的要求是，当我选择业务模块时，我需要显示业务权限和角色，如果我选择Pnic Modle，我需要显示恐慌角色和  权限，

我想用反应形式构建它，所以我试着这样做 https://plnkr.co/edit/OZGEWDEa0UzMXFO6lreG?p=preview

我不知道这是不是好方法，Pleace帮助我， 提前致谢