SetState in React ES6 - reactjs

Question

I'm just learning React & I just can't seem to get setstate in the componentdidmount function to work. It would be adorable if you could help me out. I already tried to bind it.
I keep getting errors such as Cannot read property 'setState' of undefined.
class ShareEvent extends React.Component {
constructor(props) {
super(props);
this.state = {copied: false};
this.componentDidMount = this.componentDidMount.bind(this);
}
componentDidMount() {
var clipboard = new Clipboard('#copy-button');
clipboard.on('success', function (e) {
this.setState({copied: true});
e.clearSelection();
});
clipboard.on('error', function (e) {
document.getElementById("title").innerHTML = 'Please copy manually.';
});
}
handleChange(event) {
event.preventDefault();
event.target.select();
}
render() {
const EventURL = GenerateEventUrl(this.props.EventName,this.props.EventTimeUTC);
return (
<div>
<h1>{this.state.copied ? "Copied!" : "Nicely done." }</h1>
<p>Now, simply share the link below.<br />It will display{' '}
<a href={EventURL}>the event</a>{' '}
in the local time of whoever visits it.</p>
<form>
<div className="input-group">
<input onClick={this.handleChange} type="text" className="form-control" defaultValue={EventURL} readOnly id="copy-input" />
<span className="input-group-btn">
<button className="btn btn-default" type="button" id="copy-button" data-clipboard-target="#copy-input" title="Copy to Clipboard">
Copy
</button>
</span>
</div>
</form>
</div>
);
}
}

Answer 1

You need to bind the this that references your component to your function. Change
function (e) {
this.setState({copied: true});
e.clearSelection();
}
to
function (e) {
this.setState({copied: true});
e.clearSelection();
}.bind(this)
or use ES6 arrow functions, which automatically bind this
e => {
this.setState({copied: true});
e.clearSelection();
}