Question

目前，我的所有列表均已折叠，但它们链接到一个状态为“打开”，因此，如果我打开一个列表，则所有其他列表都将打开。在不使每个列表具有很多状态的情况下，使崩溃彼此分开的最佳方法是什么。

编辑：应用程序正在经历无限循环

App.tsx

interface IState {
error: any,
intro: any,
threads: any[],
title: any,
}

export default class App extends React.Component<{}, IState> {
    constructor (props : any) {
        super (props);

        this.state = {
            error: "",
            intro: "Welcome to RedQuick",
            threads: [],
            title: ""
        };

        this.getRedditPost = this.getRedditPost.bind(this)
        this.handleClick = this.handleClick.bind(this)
    }

    public getRedditPost = async (e : any) => {
        e.preventDefault();

        const subreddit = e.target.elements.subreddit.value;
        const redditAPI = await fetch('https://www.reddit.com/r/'+ subreddit +'.json');
        const data = await redditAPI.json();

        console.log(data);

        if (data.kind) {
            this.setState({
                error: undefined,
                intro: undefined,
                threads: data.data.children,
                title: data.data.children[0].data.subreddit.toUpperCase()
            });
        } else {
            this.setState({
                error: "Please enter a valid subreddit name",
                intro: undefined,
                threads: [],
                title: undefined
            });
        }
    }

    public handleClick = (index : any)  => {
        this.setState({ [index]: true });
    }

    public render() {
        return (
            <div>
                <Header 
                    getRedditPost={this.getRedditPost}
                />
                <p className="app__intro">{this.state.intro}</p>
                {
                    this.state.error === "" && this.state.title.length > 0 ?
                    <LinearProgress />:
                    <ThreadList 
                        error={this.state.error}
                        handleClick={this.handleClick}
                        threads={this.state.threads}
                        title={this.state.title}
                    />
                }   
            </div>
        );
    }
}

Threadlist.tsx

<div className="threadlist__subreddit_threadlist">
    <List>
        { props.threads.map((thread : any, index : any) => 
            <div key={index} className="threadlist__subreddit_thread">
                <Divider />
                <ListItem button={true} onClick={props.handleClick(index)}/* component="a" href={thread.data.url}*/ >
                    <ListItemText primary={thread.data.title} secondary={<p><b>Author: </b>{thread.data.author}</p>} />
                    {props[index] ? <ExpandLess /> : <ExpandMore />}
                </ListItem>
                <Collapse in={props[index]} timeout="auto" unmountOnExit={true}>
                    <p>POOP</p>
                </Collapse>
                <Divider />
            </div>
        ) }
    </List> 
</div>

Answer 1

您必须为每次折叠创建一个不同的状态，我建议将setState与从map函数获得的索引一起动态使用setState，您可能必须将index参数传递给handleClick函数并根据该状态更改状态

<div className="threadlist__subreddit_threadlist">
    <List>
        { props.threads.map((thread : any, index : any) => 
            <div key={index} className="threadlist__subreddit_thread">
                <Divider />
                <ListItem button={true} onClick={props.handleClick(index)}/* component="a" href={thread.data.url}*/ >
                    <ListItemText primary={thread.data.title} secondary={<p><b>Author: </b>{thread.data.author}</p>} />
                    {props[index] ? <ExpandLess /> : <ExpandMore />}
                </ListItem>
                <Collapse in={props[index]} timeout="auto" unmountOnExit={true}>
                    <p>POOP</p>
                </Collapse>
                <Divider />
            </div>
        ) }
    </List> 
</div>

您的handleClick应该看起来像这样：公开

public handleClick = (index : any)  => {
        this.setState({ [index]: true });
    }

Answer 2

我是以这种方式完成的：

function DrawerMenuItems() {
  const [selectedIndex, setSelectedIndex] = React.useState("")

  const handleClick = index => {
    if (selectedIndex === index) {
      setSelectedIndex("")
    } else {
      setSelectedIndex(index)
    }
  }
  return (
    <List
      component="nav"
      aria-labelledby="nested-list-subheader"
      subheader={
        <ListSubheader component="div" id="nested-list-subheader">
          Nested List Items
        </ListSubheader>
      }
    >
      {drawerMenuItemData.map((item, index) => {
        return (
          <List>
            <ListItem
              key={index}
              button
              onClick={() => {
                handleClick(index)
              }}
            >
              <ListItemIcon>
                <item.icon />
              </ListItemIcon>
              <ListItemText primary={item.title} />
              {index === selectedIndex ? <ExpandLess /> : <ExpandMore />}
            </ListItem>
            <Collapse in={index === selectedIndex} timeout="auto" unmountOnExit>
              <List component="div" disablePadding>
                {item.submenu.map((sub, index) => {
                  return (
                    <ListItem button >
                      <ListItemText primary={sub.name} />
                    </ListItem>
                  )
                })}
              </List>
            </Collapse>
          </List>
        )
      })}
    </List>
  )
}

React Material UI多个折叠

2 个答案: