CODEWITHSUNDEEP
javascriptreactjs
Asif Biswas
Asif Biswas

Reputation: 171

How to re-render parent component from child component

parent component has a p tag which animate it's inner text. animation works when i refresh the page.

here is the Parent component:

import React, { Component } from 'react';
import Child from './Child';

class Parent extends Component {
    rerender=()=>{
        this.forceUpdate()
    }
    render() {
        return (
            <div>
                <p className='animate-left'>Animation</p>
                <Child rerender={this.rerender}/>
            </div>
        );
    }
}

export default Parent;

here is the Child component:

import React, { Component } from 'react';

class Child extends Component {
    clickHandler=()=>{
        this.props.rerender()
    }
    render() {
        return (
            <div>
                <button onClick={this.clickHandler}>Click</button>
            </div>
        );
    }
}

export default Child;

i want to animate again/ re-render parent component by clicking the button of child component. How to do that?

Upvotes: 1

Views: 4793

Answers (1)

Alan Omar
Alan Omar

Reputation: 4217

You have to have state in the parent component and pass down this state to the child component:

import React, { Component } from "react";
import Child from "./Child";

class Parent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      counter: 0
    };
  }
  rerender = () => {
    this.forceUpdate();
  };
  forceUpdate = () => {
    this.setState((state) => ({
      counter: state.counter + 1
    }));
  };
  render() {
    console.log("got rendered");
    return (
      <div>
        <p className="animate-left" key={this.state.counter}>Animation</p>
        <Child rerender={this.rerender} />
      </div>
    );
  }
}

export default Parent;

and in the child component update this state:

import React, { Component } from "react";

class Child extends Component {
  clickHandler = () => {
    this.props.rerender();
  };
  render() {
    return (
      <div>
        <button onClick={this.clickHandler}>Click</button>
      </div>
    );
  }
}

export default Child;

Upvotes: 2

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