将 json 数据转换为 component.ts 中的对象

Question

我有 json 数据，我想将其转换为对象格式以进行创建操作。

json

[
{
    "user": {
        "id": 83,
        "username": "das",
        "first_name": "dsafha",
        "last_name": "dfksdfk",
        "email": "sasda@gmail.com",
        "is_active": true,
        "is_superuser": false
    },
    "role": "testBu"
},
{
    "user": {
        "id": 84,
        "username": "sadfds",
        "first_name": "dshhgds",
        "last_name": "fsdjsl",
        "email": "fdjgd@gmail.com",
        "is_active": true,
        "is_superuser": false
    },
    "role": "testeditrole"
},
{
    "user": {
        "id": 86,
        "username": "fs",
        "first_name": "efhks",
        "last_name": "sofdh",
        "email": "fdshk@gmail.com",
        "is_active": true,
        "is_superuser": false
    },
    "role": "testeditrole"
},
{
    "user": {
        "id": 87,
        "username": "xz",
        "first_name": "vj",
        "last_name": "vkfd",
        "email": "sdsl@gmail.com",
        "is_active": true,
        "is_superuser": false
    },
    "role": "testeditrole"
}
]

我试过这样做

componet.ts

let user:any = {};
   user["username"] = this.user.user.email
   user["first_name"] = this.user.user.first_name
   user["last_name"]= this.user.user.last_name
   user["email"]= this.user.user.email

   this.userData["user"] = user
   this.userData["role"] = this.user.role

在输入字段中输入数据后安慰我，我没有得到角色数据。我确实得到了其他数据。角色数据显示为空。我确实认为这是因为我在 componet.ts 中编写代码的方式导致了这个问题。

Answer 1

this.userData["role"] = this.user.role 应该是 this.userData["role"] = this.role

Answer 2

无需转换。它已经是 json 格式，但您应该使用数组索引然后设置用户变量。

例如：

let user:any = {};
user = this.user[arrayIndex].user;

this.userData["user"] = user
this.userData["role"] = this.user[arrayIndex].role;

如果你想从 json 数组中获取数据，你应该使用数组索引。像这样。

let user:any = {};
user = this.user[0].user;
this.userData["role"] = this.user[0].role;

Answer 3

您可以随时创建模型：

export class User {
 id: string,
 username: string,
 first_name: string,
 last_name: string,
 email: string,
 is_active: boolean,
 is_superuser: boolean
}
    
export class UserDetails{
 user:User;
 role:string;
}

然后：

// Assume you have received the json in string form in
'resultlist' variable
let dataList = <Array<UserDetails>>JSON.parse(resultlist);

或者：

// Assume you have received the json in object form in 'resultlist' variable
let dataList = <Array<UserDetails>>resultlist;

Answer 4

我认为最好的方法是，创建一个与 JSON 的结构相对应的对象，然后将数据 JSON 分配给对象的数组。

class User{
   id:string;
   username:string;
   firstName:string;
   lastName:string;
   email:string;
   isActive:boolean;
   isSuperviser:boolean;
}
class JSONData{
   user:User;
   role:string
}
 data:JSONData[] = yourJson.data;

您将 json 数据中的属性名称调整为您 class 中的名称，您可以正确轻松地处理数据，请参考此 link more infos

将 json 数据转换为 component.ts 中的对象

convert json data to object in component.ts

angular

angular5

angular6

angular6-json-schema-form