Question

在“我的Angular”应用中，我有一个从Web api获取数据的服务，URL地址如下：

/api/user/1

因此，数字前缀就是用户名。编写我的服务是为了获取activeUser并将该信息绑定到另一个视图中。但是似乎没有数据通过吗？所以我的代码是：

service.ts

import { Injectable } from '@angular/core';
import { Observable, of } from 'rxjs';
import { HttpClient } from '@angular/common/http';
import { catchError, tap } from 'rxjs/operators';

@Injectable({
  providedIn: 'root'
})
export class UserService {

  constructor(
    private http: HttpClient,
  ) { }

  public users: any = null;
  public activeUser = null;

  public getUsers(): Observable<any> {
    if (this.users) {
      return of(this.users);
    } else {
      return this.http.get<any>('/api/user').pipe(
        tap(users => {
          this.users = users;
        })
      );
    }
  }

  public getUser(id): Observable<any> {
    const existingUser = this.users ? this.users.results.find(user => user.id === id) : null;
    if (existingUser && existingUser.addresses) {
      return of (existingUser);
    } else {
      return this.http.get<any>(`/api/user/${id}`).pipe(
        tap(user => {
          if (existingUser) {
            existingUser.address = user.address;
          }
        })
      );
    }
  }
}

App component.ts

import { Component, ElementRef } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {
  constructor(
    private elementRef : ElementRef
  ) {
  }
  public customer_id;
  public user_id;

  ngOnInit() {
    this.customer_id = this.elementRef.nativeElement.getAttribute('activeCustomer');
    this.user_id = this.elementRef.nativeElement.getAttribute('activeUser');
  }
}

然后查看。ts

import { Component, OnInit } from '@angular/core';
import { ReactiveFormsModule } from '@angular/forms';
import { FormGroup, FormControl } from '@angular/forms';
import { Validators } from '@angular/forms';
import { FormBuilder } from '@angular/forms';
import { Request } from '../../models/request.model'
import { Router } from '@angular/router';
import { Observable } from 'rxjs';
import {debounceTime, distinctUntilChanged, map} from 'rxjs/operators';
import { AppComponent } from '../../../app.component';
import { nowService } from '../../services/servicenow.service';
import { UserService } from '../../../shared/services/user.service';

import { HttpClient, HttpEventType, HttpHeaders, HttpRequest, HttpResponse } from '@angular/common/http';

  private customer_id = this.appComponent.customer_id;

  private user_id = this.appComponent.user_id;

HTML：

<p class="text-small text-gray mb-5">{{user_id}}</p>

所有这一切，但没有喜悦...

Answer 1

this.http.get()需要完整的API端点，即包括http://localhost:4412/api/user/用于本地API。

无法从Angular中的Web API获取数据

1 个答案: