'Employee' 仅指类型，但被用作值 here.ts(2693)

Question

我正在尝试创建一个类型为 Employee 的变量，但它显示错误 'Employee' 仅引用一个类型但在此处用作值。 ts(2693).

我的节目-api.ts代码：-

import { Component, OnInit } from '@angular/core';
import {HttpClient} from '@angular/common/http';

interface Employee {
    Id: String;
    EmployeeName: String;
    StartTimeUtc: String;
    EndTimeUtc: String;
    EntryNotes: String;
    DeletedOn: String;
}


@Component({
selector: 'app-show-api',
templateUrl: './show-api.component.html',
styleUrls: ['./show-api.component.css']
})


export class ShowApiComponent implements OnInit {

li:any;
lis: any=[];


constructor(private http : HttpClient){
    
}

ngOnInit(): void {
    this.http.get('Api of my JSON file')
    .subscribe(Response => {

    
    if(Response){
        hideloader();
    }

    **employee: Employee[]=Response**;


    
    });
    function hideloader(){
    document.getElementById('loading')!.style.display = 'none';}
}}

数据来自API

[

{"Id": "aa",
"EmployeeName": "bb",
"StarTimeUtc": "cc",
"EndTimeUtc": "dd",
"EntryNotes": "ee",
"DeletedOn": null },

{"Id": "ff",
"EmployeeName": "gg",
"StarTimeUtc": "hh",
"EndTimeUtc": "ii",
"EntryNotes": "jj",
"DeletedOn": null },

]

此外，如果这无法解决，请告诉我另一种从 JSON 文件获取数据的方法。

Answer 1

问题是您没有以正确的方式声明变量，也没有将 Response 映射到您的接口。

ngOnInit(): void {
    this.http.get('Api of my JSON file')
    .subscribe(Response => {

    
    if(Response){
        hideloader();
    }

    //oldCode -> **employee: Employee[]=Response**;
    /* New code */ const employee: Employee[] = Response as Employee[];
    
    });
    function hideloader(){
    document.getElementById('loading')!.style.display = 'none';}
}}

'Employee' 仅指类型，但被用作值 here.ts(2693)

'Employee' only refers to a type, but is being used as a value here.ts(2693)

angular

typescript

api

interface