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keep track of event and stop it when component unmounts

This commit is contained in:
Iuri Matias 2018-07-05 13:56:33 +03:00
parent a4bc4a2fdf
commit 64efedb9be
1 changed files with 9 additions and 3 deletions
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12
app/js/components/UserTweets.js
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@ -14,6 +14,7 @@ class UserTweets extends Component {
user: {}, user: {},
tweets: [] tweets: []
}; };
this.event = null;
} }
componentDidMount(){ componentDidMount(){
@ -38,8 +39,7 @@ class UserTweets extends Component {
_subscribeToNewTweetEvent(){ _subscribeToNewTweetEvent(){
const username = this.props.match.params.username; const username = this.props.match.params.username;
this.event = DTwitter.events.NewTweet({_from: web3.utils.keccak256(username), fromBlock: 0})
DTwitter.events.NewTweet({_from: web3.utils.keccak256(username), fromBlock: 0})
.on('data', (event) => { .on('data', (event) => {
console.log('new tweet event fired: ' + JSON.stringify(event)); console.log('new tweet event fired: ' + JSON.stringify(event));
let index = parseInt(event.returnValues.index); let index = parseInt(event.returnValues.index);
@ -62,6 +62,12 @@ class UserTweets extends Component {
}); });
} }
componentWillUnmount() {
if (!this.event) return;
// TODO: check if this is the 'right' way to remove / stop the event listener
this.event.removeListener(this.event);
}
render(){ render(){
const {user} = this.state; const {user} = this.state;
@ -98,4 +104,4 @@ class UserTweets extends Component {
} }
} }
export default UserTweets export default UserTweets