React: “this” is undefined inside a component function

Question

class PlayerControls extends React.Component {
  constructor(props) {
    super(props)

    this.state = {
      loopActive: false,
      shuffleActive: false,
    }         


        

Answer 1

You can rewrite how your onToggleLoop method is called from your render() method.

render() {
    var shuffleClassName = this.state.toggleActive ? "player-control-icon active" : "player-control-icon"

return (
  

     this.onToggleLoop(event)}
      spin={this.state.loopActive}
    />       
  
    );
  }

The React documentation shows this pattern in making calls to functions from expressions in attributes.