Question

managestation.ts

import { Component, OnInit } from '@angular/core';
import { Station } from 'src/app/_models/station';
import { StationService } from 'src/app/_services/station.service';
import { AddStaModalComponent } from 'src/app/modal/station/add-sta-modal/add-sta-modal.component';
import { EditStaModalComponent } from 'src/app/modal/station/edit-sta-modal/edit-sta-modal.component';
import { DataSharingService } from 'src/app/_services/data-sharing.service';
import { ActivatedRoute, Router, NavigationEnd } from '@angular/router';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Component({
  selector: 'app-managestation',
  templateUrl: './managestation.component.html',
  styleUrls: ['./managestation.component.scss'],
})
export class ManagestationComponent implements OnInit {
  sta: Station;
  mySubscription: any;

  constructor(
    private dataSharing: DataSharingService,
    private staService: StationService,
    private activatedRoute: ActivatedRoute,
    private router: Router
  ) {}
  getStationsByOrg(id) {
      this.staService.getStationsByOrg(id)
      .then((allData) => {
        console.log(allData);
         this.sta = allData;
      });
    }
}

managestation.component.html

<ion-content class="body">
  <ion-button expand="block" (click)="onAddStation()">Add Station
    <ion-icon name='add' slot="end"></ion-icon>
  </ion-button>
  <ion-list>
    <ion-item *ngFor="let s of sta">
      <ion-label>{{ s.name }}</ion-label>
      <ion-label>{{ s.orgId }}</ion-label>
      <ion-icon name='create' slot="end" (click)="onEditStation(s.id)"></ion-icon>
      <ion-icon name='trash' slot="end" (click)="onDeleteStation(s.id)"></ion-icon>
    </ion-item>
  </ion-list>
</ion-content>

station.ts

import { StationStatus } from './station-status.enum';

export class Station {
    id: number;
    name: string;
    orgId: number;
    address?: string;
    status: StationStatus;

    constructor(id?: number, name?: string, orgId?: number, address?: string, status?: StationStatus) {
        this.id = id;
        this.name = name;
        this.orgId = orgId;
        this.address = address;
        this.status = status;
    }
}

终端错误

src / app / members / managestation / managestation.component.ts（66,10）中的错误：错误TS2739：类型“ {}”缺少类型“ Station”的以下属性：id，名称，orgId，状态

控制台输出

 Array [ (4) […] ]
managestation.component.ts:65:16

(1) […]

0: (4) […]

0: Object { id: 5, orgId: 2, name: "BitCo Gas Jos North", … }

1: Object { id: 6, orgId: 2, name: "BitCo Gas Awolowo Road ", … }

2: Object { id: 7, orgId: 2, name: "BitCo Gas Kano Central", … }

3: Object { id: 8, orgId: 2, name: "BitCo Gas Efik", … }

length: 4

<prototype>: Array []

length: 1

<prototype>: Array []

我正在console.log中获取结果，但是我无法在我的html组件文件中使用它

结果

[
  [
    {
      "id": 9,
      "orgId": 3,
      "name": "Conap Corp Ikeja",
      "address": "23, Ogunlowo Street, Obafemi Awolowway. Ikeja, Lagos",
      "status": "active"
    },
    {
      "id": 10,
      "orgId": 3,
      "name": "Conap Corp Ota",
      "address": "23, Ogunlowo Street, Obafemi Awolowway. Ikeja, Lagos",
      "status": "active"
    },
    {
      "id": 11,
      "orgId": 3,
      "name": "Conap Corp Agbara",
      "address": "23, Ogunlowo Street, Obafemi Awolowway. Ikeja, Lagos",
      "status": "active"
    },
    {
      "id": 12,
      "orgId": 3,
      "name": "Conap Corp Agbado",
      "address": "23, Ogunlowo Street, Obafemi Awolowway. Ikeja, Lagos",
      "status": "active"
    }
  ]
]

Answer 1

您从API调用中收到了一个空对象{}，并且您为该API调用可能设置的数据类型为Station。另外，sta类型为Station：sta: Station;。您不能将空对象设置为sta。

更新：

可以观察到allData的存在。

Answer 2

您还遇到另一个错误，请查看您的代码：

export class Station {
    id: number;
    name: string;
    orgId: number;
    address?: string;
    status: StationStatus;

    constructor(id?: number, name?: string, orgId?: number, address?: string, status?: StationStatus) {
        this.id = id;
        this.name = name;
        this.orgId = orgId;
        this.address = address;
        this.status = status;
    }

查看属性，请注意。问题是，如果您查看声明，则表示大多数属性不能为null，但是如果您查看构造函数，则表示相反，哪一个是正确的？

Answer 3

我添加了allData[0]，它现在可以正常工作

  getStationsByOrg(id) {
      this.staService.getStationsByOrg(id)
      .then((allData) => {
        console.log(allData);
         this.sta = allData[0];
      });
    }

错误TS2739：类型“ {}”缺少类型中的以下属性

3 个答案: