javascript - 来自 json 的数据未填充在我的 Angular 8 应用程序中

Question

我的 json 如下所示:

    {
    "content": [
        {
            "id": 1,
            "name": "test name",
            "email": "test@test.com",
            "img_url": "url",
            "field1": [
                {
                    "id": 10,
                    "userId": 1,
                    "registeredAt": "2020-01-09T22:21:23.272",
                    "amount": 200
                }
            ],
            "field2": [
                {
                    "id": 11,
                    "userId": 1,
                    "registeredAt": "2020-01-09T22:21:46.113",
                    "amount": 200
                }
            ],
            "creationDateTime": "2020-01-05T00:00:00Z"
        }
    ],
    "page": 0,
    "size": 30,
    "totalElements": 1,
    "totalPages": 1,
    "last": true
}

我想用它填充我的 angular 8 网站。

在我的 api.service.ts 中，我有:

getMyStructure(): Observable<HttpResponse<MyStructure[]>> { 
    return this.http.get<MyStructure[]>( 
        localUrl, { observe: 'response' }); 
} 

在app.components.ts中我有:

myStructure: MyStructure[] = []; 

getMyStructure() { 
    this.api.getMyStructure() 
    .subscribe(function(resp) { 
        console.log(resp.body.length); //this prints undefined 
        console.log(resp.body) // this prints {content: Array, page: 0, size: 30, totalElements: 1, totalPages: 1, …} 
        this.myStructure = resp.body; 
    }); 
    console.log("after"); 
    console.log(this.myStructure.length); //this prints 0 

现在，myStructure 是一个接口(interface)，其中包含:

export interface Shelter {
    id: number;
    name: string;
    email: string;
    img_url: string;
    field1: string[];
    field2: string[];
    creationDateTime: string;
}

但 myStructure 内的数据不知何故未填充。我不知道为什么，你能帮我吗？

Answer 1

您需要在代码的subscribe部分添加console.log，否则当它首先执行时，您将看到它为0。将其更改为,

.subscribe(function(resp) { 
        console.log(resp.body.length); //this prints undefined 
        console.log(resp.body) // this prints {content: Array, page: 0, size: 30, totalElements: 1, totalPages: 1, …} 
        this.myStructure = resp.body; 
        console.log("after"); 
        console.log(this.myStructure.length);  
    }); 

编辑:

据我所知，您想在前端显示内容数组，因此您需要将数据分配为，

 this.myStructure = resp.body.content;