Javascript ReactJS，设置状态问题更改事件

在我的子组件中，我使用onChange设置输入：

<input onChange={this.handlePlaylistTermChange} defaultValue={'New Playlist'}/>

然后单击按钮时，我将该值传递给一个方法，该方法使用props调用在单击按钮时处于该状态的父类方法

save() {
        if (this.state.playlistName === null || this.state.playlistName === "") {
            this.props.onSave('New Playlist') ;
        } else {
            this.props.onSave(this.state.playlistName);
        }
    }

它在父类中调用：

savePlaylist(name) {
        let trackUrIs = [];

        console.log(name);
        let playlist =this.state.playlistTracks;

        playlist.forEach(track =>{
            trackUrIs.push(track.URI);

        });
        console.log( "passed in name"+ name);
        console.log(trackUrIs);

        Spotify.savePlaylist(trackUrIs,name);


        console.log('whats happening here?' + this.state.playlistName);
        this.setState({playlistTracks: []});
        this.setState({playlistName: ''});

---

这一切都很好，除了我需要Playlist name值改回“newplaylist”，但无论我做什么，onChange上发生的值都会保留。我已尝试重置子级中的状态，并将其传递给父级，无论发生什么，我都无法在单击“保存”按钮后将onchange值重置为“新建播放列表”。

DefaultValue

仅在装载时分配给输入，不能随更改而更新，您应该使用

受控输入

并根据状态设置值，为了定义

默认值

，请在

状态下对其进行初始化

state={
   playList: 'New Playlist'
}

<input onChange={this.handlePlaylistTermChange} value={this.state.playList}/>


state={
   playList: 'New Playlist'
}

<input onChange={this.handlePlaylistTermChange} value={this.state.playList}/>

handlePlaylistTermChange =(e) => {
    this.setState({playList: e.target.value});
}

constructor(props) {
    super(props);

    this.state = { clickedItem: "show here..." };
    this.ItemClick = this.ItemClick .bind(this);        
}
ItemClick = (e) => {
    this.setState({ clickedItem: e.target.value});
}