Answers for "pass element from child to parent react"

pass data from child component to parent component react native

class Parent extends React.Component {
  state = { message: "" }
  callbackFunction = (childData) => {
        this.setState({message: childData})
  },
  render() {
          return (
              <div>
                   <Child1 parentCallback = {this.callbackFunction}/>
                   <p> {this.state.message} </p>
              </div>
          );
  }
}

class Child1 extends React.Component{
  sendData = () => {
           this.props.parentCallback("Hey Popsie, How’s it going?");
      },
  render() { 
  //you can call function sendData whenever you'd like to send data from child component to Parent component.
      }
};

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);            
}

how to pass props from child to parent

class ToDoList extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            listDataFromChild: null
        };    
    },
    myCallback = (dataFromChild) => {
        this.setState({ listDataFromChild: dataFromChild });
    },
    otherFn = () => {
        [...within this other function now I still have access to this.state.listDataFromChild...]
    }
    render() {
        return (
            <div>
                 <ToDoItem callbackFromParent={this.myCallback}/>
                 [...now here I can pass this.state.listDataFromChild as a prop to any other child component...]  
     
            </div>
        );
    }
});