javascript - Angular 4选中多个复选框

Question

我有一个表单，其中用户 Angular 色显示为多个复选框:

<div *ngFor="let role of roles">
            <label for="role_{{role.id}}">
              <input type="checkbox" ngModel name="roles" id="role_{{role.id}}" value="{{role.id}}"> {{role.name}} &nbsp;&nbsp;
            </label>
          </div>

从服务器加载的 Angular 色对象看起来像这样，其中包含显示在表单上的所有 Angular 色:

{id: 1, name: "HQ", description: "A Employee User", created_at: "2017-10-07 10:43:17",…}
1
:
{id: 2, name: "admin", description: "A Manager User", created_at: "2017-10-07 10:43:17",…}
2
:
{id: 3, name: "caretaker", description: "", created_at: null, updated_at: null}

现在我想使用 form.setValue 设置多个复选框，我从服务器加载的用户对象如下所示:用户对象中的“Angular 色”是分配给用户的 Angular 色，需要在表单上检查

{
"id":13,
"name":"Wasif Khalil",
"email":"wk@wasiff.com",
"created_at":"2017-10-07 10:43:17",
"updated_at":"2017-10-09 07:45:34",
"api_token":"LKVCGPGnXZ3LyiCnyiTAg8XTpck6xWlVkeoMBgtoYZWoAOy4b5epNqMz7KG7",
"roles":[
     {"id":2,"name":"admin","description":"A Manager User","created_at":"2017-10-07 10:43:17","updated_at":"2017-10-07 10:43:17","pivot":{"user_id":"13","role_id":"2","created_at":"2017-10-07 10:43:17","updated_at":"2017-10-07 10:43:17"}
     },
     {"id":1,"name":"HQ","description":"A Employee User","created_at":"2017-10-07 10:43:17","updated_at":"2017-10-07 10:43:17","pivot":{"user_id":"13","role_id":"1","created_at":null,"updated_at":null}
     }
   ]
}

从服务器加载用户对象后，即时设置值如下:

this.form.setValue({
                        name: user.name,
                        email: user.email,
                        password:"",
                        confirm_password:"",
                        roles: [1] //here im not sure how to set roles
                    });

谁能帮我勾选加载的用户 Angular 色对象的复选框。提前致谢

编辑:抱歉没有很好地解释它，我已经编辑了我的问题以再次解释这个问题:用户对象上的 Angular 色是分配给用户的 Angular 色 Angular 色对象是要在表单中显示的所有 Angular 色的列表，请看下图:

Answer 1

您不必使用响应式表单来完成它。

HTML

  <input ...[checked]="check(user.roles,role.id)" ...>

typescript :

check(value1, value2){
  return (value1.filter(item => item.id == value2)).length
}

DEMO