Question

有这样一个问题，我已经受了几天苦，我还是一个新手。

使用对Wikipedia API的GET请求，我得到this object

事实证明，对于pages对象，属性（也是对象）的名称始终等于pageid（在本例中为“ 9475”）。如果我事先不知道该对象的名称，该如何访问该对象？

然后必须将此对象转换为数组，以便可以使用ngFor。

我使用 search.component.ts

中的 showArticleInformation 方法获得此对象

search.component.ts

import { Component, OnInit } from '@angular/core';
import { Article, ArticleInformation, ArticlesService } from '../../services/articles.service';

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

export class SearchComponent implements OnInit {
  constructor(private articlesServices: ArticlesService) { }

  searchQuery: string;

  articles: { };
  articleInformation: ArticleInformation;

  getUrl(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=opensearch&profile=strict&search='
      + searchQuery + '&limit=100&namespace=0&format=json&origin=*';
  }

  getUrlInformation(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=query&titles='
      + searchQuery + '&prop=info&format=json&origin=*';
  }

  showArticles() {
    this.articlesServices.getArticles(this.getUrl(this.searchQuery))
      .subscribe(
        (data: Article) => this.articles = Object.values({ ...data })
      );
  }

  showArticleInformation() {
    this.articlesServices.getArticleInformation(this.getUrlInformation(this.searchQuery))
      .subscribe(
        (data: ArticleInformation) => this.articleInformation = { ...data }
      );
    console.log(this.articleInformation);
  }

  ngOnInit() {
  }
}

articles.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { retry } from 'rxjs/operators';

export interface Article {
  title: string;
  collection: string[];
  description: string[];
  links: string[];
}

export interface ArticleInformation {
  batchComplete: string;
  query: {
    pages: { }
  };
}

@Injectable({
  providedIn: 'root'
})

export class ArticlesService {
  constructor(private http: HttpClient) { }

  getArticles(url) {
    return this.http.get<Article>(url)
      .pipe(
        retry(3),
      );
  }

  getArticleInformation(url) {
    return this.http.get<ArticleInformation>(url)
      .pipe(
        retry(3),
      );
  }
}

Answer 1

如果您确定pages始终具有一个属性，而只需要value，则可以使用Object.values做这样的事情：

const data = {
  batchComplete: "",
  query: {
    pages: {
      "9745": {
        pageid: 9745,
        length: 48,
        lastrevid: 100,
        contentmodel: "wikitext",
        touched: "2019-02-01"
      }
    }
  }
}

const articleInformation = {
  ...data,
  query: {
    pages: [Object.values(data.query.pages)[0]]
  }
}

console.log(articleInformation)

但是，由于interface和this.articleInformation具有不同的结构，因此需要分别使用data。

类似这样的东西：

export interface ArticleInformationNew {
  batchComplete: string;
  query: {
    pages: any[]
  };
}

在TypeScript中将内部对象属性更改为数组

1 个答案: