Скачать или смотреть How to Fetch Data on Button Click Instead of Using componentDidMount in React

Learn how to properly fetch paginated data in your React application by triggering a data fetch upon button click. Say goodbye to relying on `componentDidMount` for every page change!
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This video is based on the question https://stackoverflow.com/q/63829145/ asked by the user 'Derrick Omanwa' ( https://stackoverflow.com/u/12858019/ ) and on the answer https://stackoverflow.com/a/63829732/ provided by the user 'Ventil' ( https://stackoverflow.com/u/4637830/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Data Fetching in React

In a React application, particularly when dealing with data sourced from an API, one common task is to fetch data and display it in a structured format. In many cases, you may want to allow users to navigate through paginated data, such as a table of tasks, using pagination buttons. One of the challenges developers face is how to trigger a data fetch without relying on the componentDidMount lifecycle method every time a user clicks a button to load the next page of data.

In this post, we’ll explore a practical solution to fetching data on button clicks and ensure a smoother user experience when navigating through paginated content. We'll specifically address how to refactor your React component to handle data fetching on a button click event.

The Problem: Using componentDidMount

In your React component, you may have code similar to the following:

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This code works fine for the initial fetch when the component is mounted, but the concern arises when users want to navigate to the next page. Since componentDidMount is only called once during the component's lifecycle, it won't trigger again on subsequent button clicks.

The Solution: Fetch Data on Button Click

Instead of trying to trigger componentDidMount, you should fetch the data within the button click handler. Here’s how you can modify the onBtNext function to achieve this:

Step-by-step Refactoring

Modify the onBtNext Function
In your component, change the implementation of onBtNext to fetch data directly when the user clicks the "Next" button.

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

2. Update the State Appropriately

Using the new pageNumber, update the relevant state properties to ensure that your component properly reflects the new data, such as the task results and pagination details.

3. Render Your Component

Make sure your render method updates correctly, handling both previous and next buttons. As users click, they should seamlessly navigate through pages without needing to reload the component.

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

Key Benefits

Responsiveness: Users can quickly fetch the next set of data without any delay.

Clear Code Structure: By handling the fetch in the button click event, your code remains organized and modular.

Enhanced User Experience: Provides a more intuitive way for user navigation through paginated data.

Conclusion

Using componentDidMount for data fetching is effective for the initial load but is unsuitable for interactive navigation scenarios in React applications. By restructuring your event handler for fetching data directly through a button click, you not only streamline your code but also enhance the user experience. This pattern can easily be applied to various components across your React application when dealing with API data and user interactions.

By following these steps, you can confidently manage data fetching for pagination without relying on the component's lifecycle methods. Happy coding!