Answers for "pass props from parent to child react functional component"

Javascript

react pass prop to parent

//Form (Parent)
import React, { useState, Component } from 'react';
import Input from '../../shared/input-box/InputBox'

const Form = function (props) {

    const [value, setValue] = useState('');

    const onchange = (data) => {
        setValue(data)
        console.log("Form>", data);
    }

    return (
        <div>
            <Input data={value} onchange={(e) => { onchange(e) }}/>
        </div>
    );
}
export default Form;

//Input Box (Child)
import React from 'react';

const Input = function (props) {
    console.log("Props in Input :", props);

    const handleChange = event => {
        props.onchange(event.target.value);
    }

    return (
        <div>
            <input placeholder="name"
                id="name"
                onChange= {handleChange}
            />
        </div>
    );
}
export default Input;

Posted by: Guest on November-18-2020

pass props from parent to child react functional component

import React, { useState } from 'react';
import './App.css';
import Todo from './components/Todo'



function App() {
    const [todos, setTodos] = useState([
        {
          id: 1,
          title: 'This is first list'
        },
        {
          id: 2,
          title: 'This is second list'
        },
        {
          id: 3,
          title: 'This is third list'
        },
    ]);

return (
        <div className="App">
            <h1></h1>
            <Todo todos={todos}/> //This is how i'm passing props in parent component
        </div>
    );
}

export default App;


function Todo(props) {
    return (
        <div>
            {props.todos.map(todo => { // using props in child component and looping
                return (
                    <h1>{todo.title}</h1>
                )
            })}
        </div>  
    );
}

Posted by: Guest on February-10-2021

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>
        );
    }
});

Posted by: Guest on January-20-2021

Source

class component params in react

<input 
		type= "text"
     	value={ this.state.value || "" }
     	placeholder="Enter Name"
/>

Posted by: Guest on September-21-2020

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