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/ 9 Years ago, fri, october 2, 2015, 12:00:00
In my react component im trying to implement a simple spinner while an ajax request is in progress - im using state to store the loading status.
For some reason this piece of code below in my React component throws this error
Can only update a mounted or mounting component. This usually means
you called setState() on an unmounted component. This is a no-op.
Please check the code for the undefined component.
If I get rid of the first setState call the error goes away.
constructor(props) {
super(props);
this.loadSearches = this.loadSearches.bind(this);
this.state = {
loading: false
}
}
loadSearches() {
this.setState({
loading: true,
searches: []
});
console.log('Loading Searches..');
$.ajax({
url: this.props.source + '?projectId=' + this.props.projectId,
dataType: 'json',
crossDomain: true,
success: function(data) {
this.setState({
loading: false
});
}.bind(this),
error: function(xhr, status, err) {
console.error(this.props.url, status, err.toString());
this.setState({
loading: false
});
}.bind(this)
});
}
componentDidMount() {
setInterval(this.loadSearches, this.props.pollInterval);
}
render() {
let searches = this.state.searches || [];
return (<div>
<Table striped bordered condensed hover>
<thead>
<tr>
<th>Name</th>
<th>Submit Date</th>
<th>Dataset & Datatype</th>
<th>Results</th>
<th>Last Downloaded</th>
</tr>
</thead>
{
searches.map(function(search) {
let createdDate = moment(search.createdDate, 'X').format(YYYY-MM-DD);
let downloadedDate = moment(search.downloadedDate, 'X').format(YYYY-MM-DD);
let records = 0;
let status = search.status ? search.status.toLowerCase() : ''
return (
<tbody key={search.id}>
<tr>
<td>{search.name}</td>
<td>{createdDate}</td>
<td>{search.dataset}</td>
<td>{records}</td>
<td>{downloadedDate}</td>
</tr>
</tbody>
);
}
</Table >
</div>
);
}The question is why am I getting this error when the component should already be mounted (as its being called from componentDidMount) I thought it was safe to set state once the component is mounted ?
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