Скачать или смотреть How to Call the Parent Method from a Child Class Component in React

Learn how to effectively call a parent method from a child class component in React. This guide breaks down the solution into simple steps, ensuring clarity for better understanding.
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This video is based on the question https://stackoverflow.com/q/64401041/ asked by the user 'Akshata' ( https://stackoverflow.com/u/12468902/ ) and on the answer https://stackoverflow.com/a/64401359/ provided by the user 'Danilson Reis' ( https://stackoverflow.com/u/14124988/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Call the Parent Method from a Child Class Component in React

In React, it often becomes essential to establish communication between parent and child components, especially when you need a child component to trigger methods defined in its parent. If you're struggling with how to call a method from a parent class component in a child class component, you’re in the right place! This guide guides you step-by-step to accomplish this.

Understanding the Problem

You might have encountered a situation where you want an event handler defined in the parent component to be executed based on an interaction in the child component. For example, a button click in the child component should call a method in the parent component to perform some actions, such as calculating values.

Let’s consider the following setup:

You have a Parent class component that holds some state and a method to perform an operation (like adding two numbers).

You also have a Child class component which should trigger this operation when a button is clicked.

The Setup

Parent Component

Here's a simplified version of the Parent component:

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

Child Component

And here’s the Child component:

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

Solution Breakdown

To successfully call the parent method from the child component, we will take a closer look at how the Child component interacts with the Parent component:

Passing the Parent Method Down:

In the Parent component, we pass the Add method as a prop called investmentHandler to the Child component.

Triggering the Method:

Inside the Child component, upon the action (like a button click), we call the handleChangeActive method, which in turn calls the this.props.investmentHandler(). This is where the magic happens; your parent’s Add method gets executed.

Updating Component State:

The handleChangeActive method is designed not only to update the state of the active index but also to invoke the parent method for additional functionality, such as performing calculations.

Conclusion

By understanding the structure of your React components and how to pass methods as props, you can easily manage the communication between parent and child components. This approach allows for more dynamic and interactive user experiences in your React applications.

Feel free to try out the provided code snippets and play with the buttons to see the calculations in action. Happy coding!