How to pass data from child component to its parent in ReactJS?

Question

How to pass data from child component to its parent in ReactJS?

I'm attempting to transfer data from a child component to its parent as follow:

const ParentComponent = React.createClass({

    getInitialState() {

        return {

            language: '',

        };

    },

    handleLanguageCode: function(langValue) {

        this.setState({language: langValue});

    },



    render() {

         return (

                <div className="col-sm-9" >

                    <SelectLanguage onSelectLanguage={this.handleLanguage}/> 

                </div>

        );

});

and here is the child component:

export const SelectLanguage = React.createClass({

    getInitialState: function(){

        return{

            selectedCode: '',

            selectedLanguage: '',

        };

    },



    handleLangChange: function (e) {

        var lang = this.state.selectedLanguage;

        var code = this.state.selectedCode;

        this.props.onSelectLanguage({selectedLanguage: lang});   

        this.props.onSelectLanguage({selectedCode: code});           

    },



    render() {

        var json = require("json!../languages.json");

        var jsonArray = json.languages;

        return (

            <div >

                <DropdownList ref='dropdown'

                    data={jsonArray} 

                    value={this.state.selectedLanguage}

                    caseSensitive={false} 

                    minLength={3}

                    filter='contains'

                    onChange={this.handleLangChange} />

            </div>            

        );

    }

});

Can anyone help me to find the problem?

reactjs

3 years ago by vishaljlf39

2 Answers

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**rahul07** · Answer 1 · 2021-06-03T09:59:54

Parent:



<div className="col-sm-9">

     <SelectLanguage onSelectLanguage={this.handleLanguage} /> 

</div>

Child:



handleLangChange = () => {

    var lang = this.dropdown.value;

    this.props.onSelectLanguage(lang);            

}

**kshitijrana14** · Answer 2 · 2021-06-04T14:59:10

To pass data from child component to parent component
In Parent Component:

getData(val){

    // do not forget to bind getData in constructor

    console.log(val);

}

render(){

 return(<Child sendData={this.getData}/>);

}

In Child Component:

demoMethod(){

   this.props.sendData(value);

 }

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How to pass data from child component to its parent in ReactJS?

2 Answers

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