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Learn how to easily share data from child components to parent components in React JS using props and callback functions.
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How to Efficiently Pass Data from Child to Parent Component in React JS

When working with React, it’s common to encounter scenarios where you need to share data between components, especially from child to parent components. This can seem tricky for beginners, but it’s quite manageable with the right approach. In this post, we will explore how to pass data from a child component to a parent component using props and callback functions.

The Problem

The challenge arises when you want to get a value from a child component—let's say a tab index—and log it within the parent component. Here's an example to clarify this:

You have a child component named Tab that includes a button to change tabs. The goal is to log the tab index in the parent component when the button is clicked. Upon examination, here’s the code structure we are starting with:

Child Component (Tab.js):

[[See Video to Reveal this Text or Code Snippet]]

Parent Component (App.js):

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To log the index value from the child component in the parent component, we need to define a function in the parent and pass it down to the child component as a prop. Let’s break it down step-by-step:

Step 1: Define the Function in Parent

You start by defining a function, changeTab, in the parent component (App). This function will handle the logging of the tab index.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Pass the Function as a Prop to the Child

Next, you pass the changeTab function to the Tab component through props.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Modify the Child Component to Use the Prop

Now, modify the child component to accept the prop and utilize it inside your callback function. In this case, you will change the existing changeTab method to use the changeTab function passed from the parent.

Updated Child Component (Tab.js):

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

You’ve successfully implemented a way to pass data from a child component to a parent component in React using props and callback functions. Here’s a quick recap of the steps:

Define a Callback Function in the parent component.

Pass the Function as a Prop to the child component.

Utilize the Prop in the child component to send data back to the parent.

This method enables you to maintain a clear data flow within your React application, promoting reusability and organization. Happy coding!