React js onClick can't pass value to method

Question

I want to read the onClick event value properties. But when I click on it, I see something like this on the console:

SyntheticMouseEvent {dispatchConfig: Ob         


        

Answer 1

Using arrow function :

You must install stage-2:

npm install babel-preset-stage-2 :

class App extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            value=0
        }
    }

    changeValue = (data) => (e) => {
        alert(data);  //10
        this.setState({ [value]: data })
    }

    render() {
        const data = 10;
        return (
            

                
            
        );
    }
}
export default App;