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How to Export State of Function from Child to Parent Component in React

Learn how to effectively manage state in React by exporting state from the child component to the parent component, ensuring smooth data flow and component interaction. --- This video is based on the question https://stackoverflow.com/q/71714788/ asked by the user 'PixieDev' ( https://stackoverflow.com/u/6907331/ ) and on the answer https://stackoverflow.com/a/71715660/ provided by the user 'Giridharan Selvaraju' ( https://stackoverflow.com/u/13916565/ ) 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: Exporting state of function from child to parent component 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. --- Exporting State from Child to Parent in React When working with React and Redux, one common challenge developers face is managing state effectively across components. Specifically, you might find yourself needing to export the state of a function from a child component back to a parent component. In this guide, we'll explore how to achieve this, particularly in the context of a table component that involves pagination and editing functionalities. Understanding the Problem In your React application, you have a table component where you manage data such as temperature records. You introduced pagination and moved the mapping of your data to a separate child component named ListMapp. However, you also want to trigger the isEdit state in the parent component, ListTemp, when a user edits a temperature record through the editTemp function in the child component. Here’s what you need to know to share the state effectively: Key Needs: Retrieving the isEdit State: You want the parent component to know when the isEdit state in the child component is set. Event Handling: You'll need to call an event handler from the child component to communicate any changes back to the parent. Solution Overview The best practice for managing state across React components is to "lift the state up." This means you’ll manage the state in the parent component and pass down functions as props to allow the child component to update this state as needed. Here’s how you can do this. Step-by-Step Implementation Define Event Handler in the Parent Component: In ListTemp.js, create a function that will update the isEdit state when invoked. [[See Video to Reveal this Text or Code Snippet]] Pass the Handler as a Prop to the Child Component: When rendering ListMapp, make sure to pass the handler function you just created. [[See Video to Reveal this Text or Code Snippet]] Invoke the Handler in the Child Component: In ListMapp.js, modify the editTemp function to call this handler using the provided props. [[See Video to Reveal this Text or Code Snippet]] Updated Component Code Here’s how the altered components will look after implementing the changes: ListTemp.js: [[See Video to Reveal this Text or Code Snippet]] ListMapp.js: [[See Video to Reveal this Text or Code Snippet]] Conclusion By lifting the state up to the parent component and passing a handler function down to the child, you can maintain a clean and efficient data flow within your React application. This approach not only helps in better managing the component state but also enhances scalability and reusability of components in your application. Remember, good state management is crucial for developing robust applications, especially as components become more complex. Good luck, and happy coding!