Angular 制造；查看更多详细信息”；以2/4的角度工作

我在Angular应用程序中使用“查看更多细节”功能时遇到问题。这很简单，但我无法获得我点击的某条新闻的详细信息的价值。这就是它的工作原理，首先，你有一个新闻列表，每个新闻都有一个“查看”按钮，可以将你重定向到一个新页面。如何显示某条新闻的详细信息的价值？问题出现在news-detail.component.ts上

新闻服务.ts

@Injectable()
export class NewsService {
    constructor(private httpClient: HttpClient) {
  }

getAllNews() {
    const authToken = localStorage.getItem('auth_token'); 
    const headers = new HttpHeaders() 
    .set('Content-Type', 'application/json') 
    .set('Authorization', `Bearer ${authToken}`);

    return this.httpClient
      .get('http://sample/news/', { headers: headers })
      .map(
        (response => response));
}


getNews(index: number) {

  }

}

<div class="card" *ngFor="let newslist of newslists">
    <div class="card-header"> <button class=" btn btn-danger pull-right" style="cursor: pointer;" (click)="onViewNewsDetail(newslist.id)">View</button> 
        {{newslist.category}}          
    </div>
    <div class="card-body">
        {{newslist.title}}   
    </div>
  </div>

export class NewsListComponent implements OnInit {
  newslists: any;
  constructor(private newsService: NewsService, private router: Router, private route: ActivatedRoute) { }

  ngOnInit() {

    this.newsService.getAllNews()
      .subscribe(
        (data:any) => {
          console.log(data);
          this.newslists = data.data.data;
          console.log(this.newslists);
        },
        error => {
          alert("ERROR");
        });
  }

  onViewNewsDetail(id: number){
    console.log(id);
    this.router.navigate(['news', id]);
  }

}

    export class NewsDetailComponent implements OnInit {
    id: number;
    news: number;

  constructor(private route: ActivatedRoute,
              private router: Router,
              private newsService: NewsService) { }

    ngOnInit() {
      this.route.params
        .subscribe((params: Params) => {
          this.id = +params['id'];
          // this.news = this.newsService.getNews(this.id);
        });
    }      
}

ngOnInit() {
  this.route.params
    .subscribe((params: Params) => {
       this.id = +params['id'];
       this.newsService.getNews(this.id)
         .subscribe(news => this.news = news)
  });
}  

新闻列表.component.ts

@Injectable()
export class NewsService {
    constructor(private httpClient: HttpClient) {
  }

getAllNews() {
    const authToken = localStorage.getItem('auth_token'); 
    const headers = new HttpHeaders() 
    .set('Content-Type', 'application/json') 
    .set('Authorization', `Bearer ${authToken}`);

    return this.httpClient
      .get('http://sample/news/', { headers: headers })
      .map(
        (response => response));
}


getNews(index: number) {

  }

}

<div class="card" *ngFor="let newslist of newslists">
    <div class="card-header"> <button class=" btn btn-danger pull-right" style="cursor: pointer;" (click)="onViewNewsDetail(newslist.id)">View</button> 
        {{newslist.category}}          
    </div>
    <div class="card-body">
        {{newslist.title}}   
    </div>
  </div>

export class NewsListComponent implements OnInit {
  newslists: any;
  constructor(private newsService: NewsService, private router: Router, private route: ActivatedRoute) { }

  ngOnInit() {

    this.newsService.getAllNews()
      .subscribe(
        (data:any) => {
          console.log(data);
          this.newslists = data.data.data;
          console.log(this.newslists);
        },
        error => {
          alert("ERROR");
        });
  }

  onViewNewsDetail(id: number){
    console.log(id);
    this.router.navigate(['news', id]);
  }

}

    export class NewsDetailComponent implements OnInit {
    id: number;
    news: number;

  constructor(private route: ActivatedRoute,
              private router: Router,
              private newsService: NewsService) { }

    ngOnInit() {
      this.route.params
        .subscribe((params: Params) => {
          this.id = +params['id'];
          // this.news = this.newsService.getNews(this.id);
        });
    }      
}

ngOnInit() {
  this.route.params
    .subscribe((params: Params) => {
       this.id = +params['id'];
       this.newsService.getNews(this.id)
         .subscribe(news => this.news = news)
  });
}  

新闻详情.component.ts

@Injectable()
export class NewsService {
    constructor(private httpClient: HttpClient) {
  }

getAllNews() {
    const authToken = localStorage.getItem('auth_token'); 
    const headers = new HttpHeaders() 
    .set('Content-Type', 'application/json') 
    .set('Authorization', `Bearer ${authToken}`);

    return this.httpClient
      .get('http://sample/news/', { headers: headers })
      .map(
        (response => response));
}


getNews(index: number) {

  }

}

<div class="card" *ngFor="let newslist of newslists">
    <div class="card-header"> <button class=" btn btn-danger pull-right" style="cursor: pointer;" (click)="onViewNewsDetail(newslist.id)">View</button> 
        {{newslist.category}}          
    </div>
    <div class="card-body">
        {{newslist.title}}   
    </div>
  </div>

export class NewsListComponent implements OnInit {
  newslists: any;
  constructor(private newsService: NewsService, private router: Router, private route: ActivatedRoute) { }

  ngOnInit() {

    this.newsService.getAllNews()
      .subscribe(
        (data:any) => {
          console.log(data);
          this.newslists = data.data.data;
          console.log(this.newslists);
        },
        error => {
          alert("ERROR");
        });
  }

  onViewNewsDetail(id: number){
    console.log(id);
    this.router.navigate(['news', id]);
  }

}

    export class NewsDetailComponent implements OnInit {
    id: number;
    news: number;

  constructor(private route: ActivatedRoute,
              private router: Router,
              private newsService: NewsService) { }

    ngOnInit() {
      this.route.params
        .subscribe((params: Params) => {
          this.id = +params['id'];
          // this.news = this.newsService.getNews(this.id);
        });
    }      
}

ngOnInit() {
  this.route.params
    .subscribe((params: Params) => {
       this.id = +params['id'];
       this.newsService.getNews(this.id)
         .subscribe(news => this.news = news)
  });
}  

---

您是否有类似于{path:'news/:id'，component:news-detail.component}的路由？

如果您没有获取单个新闻文章的端点，那么类似的内容可能适合您

服务

getNews(id: number) {
  return this.getAllNews().map((data: any) => data.data.data.find(news => news.id === id))
}

新闻详情.component.ts

@Injectable()
export class NewsService {
    constructor(private httpClient: HttpClient) {
  }

getAllNews() {
    const authToken = localStorage.getItem('auth_token'); 
    const headers = new HttpHeaders() 
    .set('Content-Type', 'application/json') 
    .set('Authorization', `Bearer ${authToken}`);

    return this.httpClient
      .get('http://sample/news/', { headers: headers })
      .map(
        (response => response));
}


getNews(index: number) {

  }

}

<div class="card" *ngFor="let newslist of newslists">
    <div class="card-header"> <button class=" btn btn-danger pull-right" style="cursor: pointer;" (click)="onViewNewsDetail(newslist.id)">View</button> 
        {{newslist.category}}          
    </div>
    <div class="card-body">
        {{newslist.title}}   
    </div>
  </div>

export class NewsListComponent implements OnInit {
  newslists: any;
  constructor(private newsService: NewsService, private router: Router, private route: ActivatedRoute) { }

  ngOnInit() {

    this.newsService.getAllNews()
      .subscribe(
        (data:any) => {
          console.log(data);
          this.newslists = data.data.data;
          console.log(this.newslists);
        },
        error => {
          alert("ERROR");
        });
  }

  onViewNewsDetail(id: number){
    console.log(id);
    this.router.navigate(['news', id]);
  }

}

    export class NewsDetailComponent implements OnInit {
    id: number;
    news: number;

  constructor(private route: ActivatedRoute,
              private router: Router,
              private newsService: NewsService) { }

    ngOnInit() {
      this.route.params
        .subscribe((params: Params) => {
          this.id = +params['id'];
          // this.news = this.newsService.getNews(this.id);
        });
    }      
}

ngOnInit() {
  this.route.params
    .subscribe((params: Params) => {
       this.id = +params['id'];
       this.newsService.getNews(this.id)
         .subscribe(news => this.news = news)
  });
}  

---

就像你做了getAllNews一样吗？@Kyrsberg。如何过滤它？getAllNews将显示新闻列表。我想显示单击的特定新闻的详细信息。是否没有用于查询单个新闻的端点？类似这样的

this.httpClient.get（'http://sample/news/${id}'）

@Kyrsberg那么如何过滤它呢？它说type object

this.getAllNews（）.map（listOfNews=>listOfNews.find（news=>news.id==id））上不存在find属性。

希望

getAllNews

方法返回一个数组，但是它返回的objectIt doesnt不是response.json，因为httpClient将其解析为json。我如何解决这个问题？我再次修改了答案