Accessing return variable of React class component

Question

I have react component which returns an integer. Structure of the class component is as follows:

class MyClass extends Component {
   constructor(props) {
        super(props);
        this.state = {
            variable : 0
        }
    }
    componentDidMount(){
       // do some works
       this.setSate({variable:$someValue});
    }
    render(){
        var temp = this.state.variable;
        return temp;
    }
}

I need to fetch the value returned from MyClass in another class component in React within render. If I call like,

render () {
  return (
    <div>{Myclass}</div>
  );
}

it works fine. is there any way to call this outside return, and assign the value to a variable?

Rayes · Accepted Answer · 2018-07-17 08:05:44Z

1

Try utilizing 'this.props' instead. You can pass in something like this

   class MyClass extends Component {
   constructor(props) {
        super(props);
        this.state = {
            variable : 0
        }
    }
    componentDidMount(){
       // do some works
       this.setSate({variable:$someValue});
    }
    render(){
        const {variable} = this.state
        return (
             <MyOtherClass variable = {variable}/>
         );
    }
}

And in MyOtherClass:

render() {
    const {variable} = this.props
    return (
        <div>{variable}</div>
    );
}

answered Jul 17, 2018 at 8:05

Rayes

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Comments

Teneff · Accepted Answer · 2018-07-17 08:00:31Z

0

You should be able to extend MyClass and call super.render()

class MyOtherClass extends MyClass {

    render() {
        const value = super.render();
        return (
            <div>{value}</div>
        );
    }
}

edit: working example in codesandbox.io

edited Jul 17, 2018 at 8:00

answered Jul 17, 2018 at 7:50

Teneff

32.3k13 gold badges76 silver badges107 bronze badges

2 Comments

Vithursa Mahendrarajah Over a year ago

need to access the integer for further processing @Teneff

Vithursa Mahendrarajah Over a year ago

It says as Super expression must either be null or a function, not undefined @Teneff

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