javascript - 在一个函数中使用 React useState 选择列表类型

Question

我正在使用 React useState 来显示所选文章类型的文章列表。我已经设法使用两个单独的函数使其工作，但我想知道是否有一种方法可以在用户有许多不同选项可供选择的情况下将其放入一个函数中？

function MostReadArticlesList() {
  const [list, setList] = useState(mostReadArticles);
  const [mostReadStyle, setMostReadStyle] = useState(styles["mostReadArticlesHeaderChosen"])
  const [editorsChoiceStyle, setEditorsChoiceStyle] = useState(styles["editorsChoiceHeader"])
  const [rankColor, setRankColor] = useState(styles.mostReadArticlesRankRed)

  function selectMostRead() {
    setList(mostReadArticles);
    setMostReadStyle(styles["mostReadArticlesHeaderChosen"]);
    setEditorsChoiceStyle(styles["editorsChoiceHeader"]);
    setRankColor(styles.mostReadArticlesRankRed);
  };

  function selectEditorsChoice() {
    setList(editorsChoiceArticles);
    setMostReadStyle(styles["mostReadArticlesHeader"]);
    setEditorsChoiceStyle(styles["editorsChoiceHeaderChosen"]);
    setRankColor(styles.mostReadArticlesRankBlue);
  };

  return (
    <div className={styles.mostReadArticlesListContainer}>
      <div className={styles.mostReadArticlesHeaderDiv}>
        <Button className={mostReadStyle} onClick={selectMostRead}>
          <Icon icon="assets/img/circle-growth-icon.png" />
          <span>Most Read</span>
        </Button>
        <Button className={editorsChoiceStyle} onClick={selectEditorsChoice}>
          <Icon icon="assets/img/notes-star-icon.png" />
          <span>Editors Choice</span>
        </Button>
      </div>
      <div className={styles.mostReadArticlesList}>
        {list.map((article) => (
          <MostReadArticlesCard
            id={article.id}
            rank={article.rank}
            headline={article.headline}
            date={article.date}
            rankColor={rankColor}
          />
        ))}
      </div>
    </div>
  );
}

export default MostReadArticlesList;

标签： javascriptreactjsfunctionreact-hooks

Answer 1

我不确定那里在做什么，您是否使用 CSS 样式对文章进行排序？这是不好的。您应该使用 JS 对它们进行排序。

一个例子Array.sort()：

const [list, setList] = useState(articles);

const sortBy = ( property ) = {
    const newList = [...list]; // This is not fully immutable - but should work

    newList.sort( (a, b) => {
        if(a[property] < b[property]) { return -1; }
        if(a[property] > b[property]) { return 1; }
        return 0;
    })

    setList( newList );
}

...

<button onClick={() => sortBy('rank')}>By rank</button>
<button onClick={() => sortBy('headline')}>By headline</button>

---

/编辑

一个管理两个列表的功能（理论上您可以使用一种状态），我建议您active对所有活动按钮使用一个类，而不是“mostReadArticlesHeaderChosen”。

const [list, setList] = useState(mostReadArticles);
const [active, setActive] = useState('mostRead');

function selectList( listName ) {
    switch(listName) {
        case 'mostRead': {
            setList(mostReadArticles);
            setActive('mostRead');
        }
        case 'editorsChoice': {
            setList(editorsChoiceArticles);
            setActive('editorsChoice');
        }
        default:
    }
}

...

<button 
    class={ active === 'mostRead' ? 'mostReadArticlesHeaderChosen' : 'mostReadArticlesHeader'}
    onClick={() => selectList('mostRead')}
>
    Most Read
</button>
<button 
    class={ active === 'editorsChoice' ? 'editorsChoiceHeaderChosen' : 'editorsChoiceHeader'} 
    onClick={() => selectList('editorsChoice')}
>
    Editor's Choice
</button>