Javascript 将列表子项传递给父项

您需要通过回调传递movie元素。仅将子组件更改为：

    


    
       I am new to React and trying to understand the basics. I have a child component called movieList that return a list of movies in a table form. 
    const movieList = () =>{ 
        const {movies} = props;
        return (){
        <tbody>
          <Fragment>
            {movies.map((movie, i) => (
            <tr key={i}>
              <td>{movie.title}</td>
              <td>{movie.genre.name}</td>
              <td>{movie.numberInStock}</td>
              <td>{movie.dailyRentalRate}</td>
              <td><button className="btn btn-danger btn-sm" onClick={props.onClick} movie={props.movie}>Delete</button></td>
    
            </tr>
            ))}
    
          </Fragment>
        </tbody>
        } }
    
    
之后，需要将回调中的数据传递给父函数中的函数

onClick={() => props.onClick(movie)}

或者只是

onClick={movie => this.handleDelete(movie)}

然后，您需要做的就是从您所在州的列表中删除该电影。React然后将从DOM中删除该元素：

onClick={this.handleDelete}

酷，所以你有一个电影列表，你只需要删除正确的电影。我们将尝试通过数组中的索引删除电影。我们将使用array.filter方法。请参见沙盒以获取参考：

父母亲
嗨，Olasunkanmi，请尝试下面的解决方案，如果有帮助，请告诉我：
handleDelete = (movie) => {
   const { movies } = this.state;
   const newMoviews = movies.slice();
   newMovies.splice(newMovies.findIndex(m => m.title === movie.title), 1)
   this.setState({ movies: newMovies });
}

class Movies extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      movies: [
        { genre: { name: "Avengers: End Game" }, numberInStock: 100000, dailyRentalRate: 1 },
        { genre: { name: "Harry Potter" }, numberInStock: 20000, dailyRentalRate: 2 },
        { genre: { name: "DBZ" }, numberInStock: 200000, dailyRentalRate: 1}
      ]
    }; // assuming movies is an array
  }

  handleDelete = movieIndex => {
    const { movies } = this.state;
    const updatedMovies = movies.filter((movie, index) => {
      return index !== movieIndex;
    });

    this.setState({
      movies: updatedMovies
    });
  };

  render() {
    return (
      <MovieList movies={this.state.movies} handleDelete={this.handleDelete} />
    );
  }
}

const MovieList = (props) =>{ 
  const {movies} = props;
  return (
    <tbody>
    <Fragment>
      {movies.map((movie, i) => (
      <tr key={i}>
         <td>{movie}</td>
         <td>{movie.genre.name}</td>
         <td>{movie.numberInStock}</td>
         <td>{movie.dailyRentalRate}</td>
         <td><button className="btn btn-danger btn-sm" onClick={() => props.handleDelete(i)} movie={props.movie}>Delete</button></td>
          </tr>
       ))}
     </Fragment>
   </tbody>
  )
}