Question : TypeError: Cannot read property 'setState' of undefined
Answered by : kshitij
class Counter extends React.Component { constructor(props) { super(props); this.state = { count : 1 }; this.delta = this.delta.bind(this); } delta() { this.setState({ count : this.state.count++ }); } render() { return ( <div> <h1>{this.state.count}</h1> <button onClick={this.delta}>+</button> </div> ); }
}Source : | Last Update : Tue, 06 Apr 21
Question : Cannot read property 'setState' of undefined
Answered by : hjmcoder
// way #1 - recommended
// puting .bind(this) after using the reference <input onChange={this.onInputChange.bind(this)} placeholder="First Name" />
// way #2
// adding this line for each method you use constructor(){ this.onInputChange = this.onInputChange.bind(this) } Source : | Last Update : Thu, 11 Mar 21