Скачать или смотреть How to Call a Function Within a React Component on a Click Event from Another Component

Learn how to effectively manage click events across different React components and keep your application state in sync.
---
This video is based on the question https://stackoverflow.com/q/72887303/ asked by the user 'Soujanya J' ( https://stackoverflow.com/u/4595695/ ) and on the answer https://stackoverflow.com/a/72890034/ provided by the user 'Rahul Jujarey' ( https://stackoverflow.com/u/966743/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Calling function defined within a react function component on a click event form another function component - React.js

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Problem

In the world of React.js, developers often encounter scenarios where they need to trigger functions from one component based on user interactions in another. For instance, consider a use case where you have a parent component (ComponentA) that prepares node objects for rendering. You also have a stateless child component (CardNode) containing a button that, when clicked, should trigger a state-update function defined in the parent component. This poses a significant challenge, especially when you want to maintain the application's state and responsiveness.

Overview of the Scenario

Parent Component (ComponentA): Responsible for rendering nodes and edges using React Flow.

Child Component (CardNode): Contains a button that, when clicked, should trigger a function (prepareNodes) in the parent component.

Goal: To ensure that clicking the button in the child component directly invokes a function in the parent component, updating the state as necessary.

Solution: Connecting the Dots

The solution to this problem revolves around effectively managing event handlers and state updates across React components. Let's break it down:

Step 1: Passing Functions Between Components

To allow the child component to access the function defined in the parent, you'll need to pass it as a prop.

Update ComponentA:
In ComponentA, define your function and pass it down to CardNode.

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

Step 2: Handling Click Events in the Child Component

In the child component (CardNode), you'll need to define an onClick event handler that will call the function passed down from the parent.

Update CardNode:
Modify CardNode to accept the onNodeClick function and invoke it on button click.

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

Step 3: Updating Parent's State

In prepareNode, you can now perform operations as needed when the button in CardNode is clicked.

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

Conclusion

By passing functions and handling events through props, you can seamlessly connect your React components and ensure they work together effectively. This approach not only solves the problem of triggering parent functions from child components but also aligns with React's design principles of managing state and props.

With this structure in place, your application remains responsive and maintainable, enabling you to deal with future interactions more efficiently.

Now, you’re all set to handle click events across different components in React.js!