child respect parent with react js code example

Example 1: communication child to parent react js

import React from 'react';

import Child from './Child'

export default class Parent extends React.Component {

      constructor(props){

            super(props);

            this.state ={ text:''};

       }

     handleChangeInParent = (event) => {

             this.setState({text:event.target.value})

     }

    render() {

        return (

                  <>

                     <p>You have written: </p>

                     <p>{this.state.text}</p>

                     <Child handleChange={this.handleChangeInParent}/>

                   </>

                )

      }

}

Example 2: pass element from child to parent react

Parent:

<div className="col-sm-9">
     <SelectLanguage onSelectLanguage={this.handleLanguage} /> 
</div>

Child:

handleLangChange = () => {
    var lang = this.dropdown.value;
    this.props.onSelectLanguage(lang);            
}