I read and tried so hard, but still could not find a way to successfully replace componentWillReceiveProps with getDerivedStateFromProps. Here is my code, componentWillReceiveProps one is working fine. but the getDerivedStateFromProps which I tried is not working(after componentDidMount() running OK, state.movies eventually become [] empty). Thanks for your kind help!
class OK_MovieListContainer extends React.Component {
constructor(props) {
super(props);
this.state = {
movies: [],
title:''
};
this.discoverMovieDB = this.discoverMovieDB.bind(this);
this.searchMovieDBAPI = this.searchMovieDBAPI.bind(this);
}
componentDidMount() {
this.discoverMovieDB();
}
UNSAFE_componentWillReceiveProps(nextProps, prevState) {
if (nextProps.match.params.title && prevState.title !== nextProps.match.params.title) {
this.searchMovieDBAPI(nextProps.match.params.title);
this.setState({ title: nextProps.match.params.title });
}
}
async discoverMovieDB() {
.....
}
async searchMovieDBAPI(title) {
const promisedData = await MovieDBAPI.search(title);
if (promisedData) {
this.setState({ movies: promisedData[0] });
}
}
}
render() {
return (
<div className="App">
<MovieList movies={this.state.movies} />
</div>
);
}
}
export default OK_MovieListContainer;
the following is what I tried with getDerivedStateFromProps , but not working(after componentDidMount() running OK, state.movies eventually become [] empty). ....T.T
class MovieListContainer extends React.Component {
constructor(props) {
super(props);
this.state = {
movies: [],
title:''
};
this.discoverMovieDB = this.discoverMovieDB.bind(this);
this.searchMovieDBAPI = this.searchMovieDBAPI.bind(this);
}
static getDerivedStateFromProps(nextProps, prevState) {
if (nextProps.match.params.title && nextProps.match.params.title !== prevState.title) {
return {
//this state changes then componentDidUpdate is called
title: nextProps.match.params.title
};
}
//indicate state update not required
return null;
}
componentDidMount() {
this.discoverMovieDB();
}
componentDidUpdate(nextProps, prevState) {
if (nextProps.match.params.title !== prevState.title) {
this.searchMovieDBAPI(nextProps.match.params.title);
this.setState({ title: nextProps.match.params.title });
}
}
async discoverMovieDB() {
.....
}
async searchMovieDBAPI(title) {
const promisedData = await MovieDBAPI.search(title);
if (promisedData) {
this.setState({ movies: promisedData[0] });
}
}
}
render() {
return (
<div className="App">
<MovieList movies={this.state.movies} />
</div>
);
}
}
export default MovieListContainer;
Thank you so much!
