Error navigating between pages with async data with react-router
So basically sometimes when I scroll between pages with React-router and I go try to go to a page with async code that runs as the lifecycle runs (componentDidMount) it throws me an error saying you can't map a state of 'null'.
question is.. how can I prevent that from happening when navigating between pages?
Example (Dashboard)
class Dashboard extends Component {
componentDidMount() {
this.props.fetchMovies();
this.props.fetchSeries();
}
handleFetchMovies() {
if(this.props.assets.fetchMoviesError) {
return (
<div className="loading">
<h1>{this.props.assets.fetchMoviesError}</h1>
</div>
);
} else if(this.props.assets.loadingMovies) {
return (
<div className="loading">
<h1>Loading...</h1>
</div>
);
} else {
return this.props.assets.latestMovies.map(movie => {
const movieURL = movie.title.split(' ').join('+').toLowerCase().trim();
return (
<div className="latest" key={movie._id}>
<Link to={`/movie/${movieURL}`}>
<div className="asset-cover" style={{ backgroundImage: `url(${movie.poster})` }}></div>
</Link>
<h1><Link to={`/movie/${movieURL}`}>{movie.title}</Link></h1>
<Link to={`/sort/years/${movie.year }`}>{movie.year}</Link>
</div>
)
}
)
}
}
whenever I go from this page to a different page and try to go back to it it says
this.props.assets.latestMovies.map is not a function
because the componentDidMount function didn't run.
redux react-redux react-router
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
add a comment |
So basically sometimes when I scroll between pages with React-router and I go try to go to a page with async code that runs as the lifecycle runs (componentDidMount) it throws me an error saying you can't map a state of 'null'.
question is.. how can I prevent that from happening when navigating between pages?
Example (Dashboard)
class Dashboard extends Component {
componentDidMount() {
this.props.fetchMovies();
this.props.fetchSeries();
}
handleFetchMovies() {
if(this.props.assets.fetchMoviesError) {
return (
<div className="loading">
<h1>{this.props.assets.fetchMoviesError}</h1>
</div>
);
} else if(this.props.assets.loadingMovies) {
return (
<div className="loading">
<h1>Loading...</h1>
</div>
);
} else {
return this.props.assets.latestMovies.map(movie => {
const movieURL = movie.title.split(' ').join('+').toLowerCase().trim();
return (
<div className="latest" key={movie._id}>
<Link to={`/movie/${movieURL}`}>
<div className="asset-cover" style={{ backgroundImage: `url(${movie.poster})` }}></div>
</Link>
<h1><Link to={`/movie/${movieURL}`}>{movie.title}</Link></h1>
<Link to={`/sort/years/${movie.year }`}>{movie.year}</Link>
</div>
)
}
)
}
}
whenever I go from this page to a different page and try to go back to it it says
this.props.assets.latestMovies.map is not a function
because the componentDidMount function didn't run.
redux react-redux react-router
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31
add a comment |
So basically sometimes when I scroll between pages with React-router and I go try to go to a page with async code that runs as the lifecycle runs (componentDidMount) it throws me an error saying you can't map a state of 'null'.
question is.. how can I prevent that from happening when navigating between pages?
Example (Dashboard)
class Dashboard extends Component {
componentDidMount() {
this.props.fetchMovies();
this.props.fetchSeries();
}
handleFetchMovies() {
if(this.props.assets.fetchMoviesError) {
return (
<div className="loading">
<h1>{this.props.assets.fetchMoviesError}</h1>
</div>
);
} else if(this.props.assets.loadingMovies) {
return (
<div className="loading">
<h1>Loading...</h1>
</div>
);
} else {
return this.props.assets.latestMovies.map(movie => {
const movieURL = movie.title.split(' ').join('+').toLowerCase().trim();
return (
<div className="latest" key={movie._id}>
<Link to={`/movie/${movieURL}`}>
<div className="asset-cover" style={{ backgroundImage: `url(${movie.poster})` }}></div>
</Link>
<h1><Link to={`/movie/${movieURL}`}>{movie.title}</Link></h1>
<Link to={`/sort/years/${movie.year }`}>{movie.year}</Link>
</div>
)
}
)
}
}
whenever I go from this page to a different page and try to go back to it it says
this.props.assets.latestMovies.map is not a function
because the componentDidMount function didn't run.
redux react-redux react-router
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
So basically sometimes when I scroll between pages with React-router and I go try to go to a page with async code that runs as the lifecycle runs (componentDidMount) it throws me an error saying you can't map a state of 'null'.
question is.. how can I prevent that from happening when navigating between pages?
Example (Dashboard)
class Dashboard extends Component {
componentDidMount() {
this.props.fetchMovies();
this.props.fetchSeries();
}
handleFetchMovies() {
if(this.props.assets.fetchMoviesError) {
return (
<div className="loading">
<h1>{this.props.assets.fetchMoviesError}</h1>
</div>
);
} else if(this.props.assets.loadingMovies) {
return (
<div className="loading">
<h1>Loading...</h1>
</div>
);
} else {
return this.props.assets.latestMovies.map(movie => {
const movieURL = movie.title.split(' ').join('+').toLowerCase().trim();
return (
<div className="latest" key={movie._id}>
<Link to={`/movie/${movieURL}`}>
<div className="asset-cover" style={{ backgroundImage: `url(${movie.poster})` }}></div>
</Link>
<h1><Link to={`/movie/${movieURL}`}>{movie.title}</Link></h1>
<Link to={`/sort/years/${movie.year }`}>{movie.year}</Link>
</div>
)
}
)
}
}
whenever I go from this page to a different page and try to go back to it it says
this.props.assets.latestMovies.map is not a function
because the componentDidMount function didn't run.
redux react-redux react-router
redux react-redux react-router
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
edited Nov 27 '18 at 19:31
Laylaz
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
asked Nov 24 '18 at 2:39
LaylazLaylaz
125
125
Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31
add a comment |
Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31
Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31
add a comment |
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Can you include the component class or piece of code thats causing the error and the exact error message please? :)
– Shawn Andrews
Nov 24 '18 at 4:33
hey @ShawnAndrews I did add it now, I'm sorry for being so late I was out of city. :)
– Laylaz
Nov 27 '18 at 19:31