How to Call Parent Component Functions from a Child in React

Описание: Discover how to effectively `call functions` from a parent React component inside its child component, and improve your React skills!
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This video is based on the question https://stackoverflow.com/q/69990664/ asked by the user 'Merkie' ( https://stackoverflow.com/u/16569627/ ) and on the answer https://stackoverflow.com/a/69990958/ provided by the user 'Arshal Daison' ( https://stackoverflow.com/u/12923656/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Call Parent Component Functions from a Child in React

When working with React, you may find yourself needing to call a function from a parent component within a child component. If you’re new to React, this might seem confusing at first, but it's a common task that becomes easier once you understand the concept of props. In this guide, we’ll break down how to accomplish this step by step. Let's dive in!

Understanding the Problem

In your scenario, you have a TileGrid parent component that contains a function called updateTileData. You want to trigger this function from a Tile child component in response to user actions, like clicking a button. Here’s a simplified breakdown of your setup:

Parent Component: TileGrid has a method updateTileData that is intended to handle data updates.

Child Component: Tile, which needs to call the parent's method when a button is clicked.

This is a common situation in React, where child components require access to parent methods to modify state or trigger updates.

The Solution: Passing Functions as Props

The solution to your problem lies in utilizing props. In React, you can pass functions (along with data) from a parent component to a child component via props. Here’s how you can implement this solution step by step.

Step 1: Pass the Function as a Prop

You need to pass the updateTileData function from the TileGrid parent to the Tile child. Modify your TileGrid's render method to include the function in the props.

Modified Parent Component (TileGrid):

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

Step 2: Use the Function in the Child Component

Next, you need to update the Tile component to use the function when a button is clicked. Access the function through props and call it with the desired parameters.

Modified Child Component (Tile):

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

Step 3: Wiring it All Together

With these changes, your Tile component will call the updateTileData function defined in your TileGrid parent component when the button is clicked. Here’s what happens in broad strokes:

The TileGrid component passes the function updateTileData to Tile via the func prop.

In the Tile component, when the ButtonBase is clicked, it calls props.func() with 'New Value' as a parameter.

As a result, the updateTileData function in TileGrid executes, and you can process the value accordingly.

Conclusion

In this guide, we've explored how to effectively call parent component functions from a child component in React using props. Passing functions to children is an essential pattern in React and helps to facilitate communication between components. As you continue to learn and practice, you’ll find that mastering top-down data flow and function passing will greatly enhance your skills in building React applications.

Happy coding!