emit in react to close a modal from the click of a button in the child component in javascript

In React, you can use event handling and communication between components to achieve the desired functionality of closing a modal from a button click in a child component.

Here's an example of how you can implement this:

1. In your parent component (where the modal is rendered), define a state variable to control the visibility of the modal. Let's call it showModal and initialize it as false.

index.tsx
import React, { useState } from 'react';

function ParentComponent() {
  const [showModal, setShowModal] = useState(false);

  const openModal = () => {
    setShowModal(true);
  }

  const closeModal = () => {
    setShowModal(false);
  }

  return (
    <div>
      <button onClick={openModal}>Open Modal</button>
      {showModal && (
        <Modal closeModal={closeModal} />
      )}
    </div>
  );
}
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2. Create your child component, in this case, we'll call it Modal. This component will receive a prop called closeModal, which is the function passed down from the parent component.

index.tsx
import React from 'react';

function Modal({ closeModal }) {
  return (
    <div>
      <h2>Modal Content</h2>
      <button onClick={closeModal}>Close Modal</button>
    </div>
  );
}
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3. When the button inside the Modal component is clicked, it will invoke the closeModal function passed as a prop from the parent component. This function updates the showModal state in the parent component, closing the modal.

By passing the closeModal function as a prop to the child component, you ensure that the child component can communicate with the parent component and trigger the desired behavior.

Using this pattern, you can emit an event from a child component to close a modal in a parent component in React.