Скачать или смотреть Fixing React Conditional Rendering Issues for Mobile and Desktop Views

This guide discusses how to prevent flickering of the Desktop view in mobile rendering on React applications and provides a solution for conditional rendering based on viewport size.
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This video is based on the question https://stackoverflow.com/q/63130723/ asked by the user 'Ramanand Dubey' ( https://stackoverflow.com/u/13328399/ ) and on the answer https://stackoverflow.com/a/63130824/ provided by the user 'Apostolos' ( https://stackoverflow.com/u/1121008/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing React Conditional Rendering Issues for Mobile and Desktop Views

If you're working with a responsive React application, you might face a common issue where the desktop version of your app briefly appears when the page is loaded in mobile view. In this guide, we'll explore why this happens and how to fix it using proper state initialization and conditional rendering patterns in React.

The Problem: Flickering of Desktop View in Mobile Rendering

Imagine you have a React component that conditionally renders a desktop or mobile menu based on the width of the user’s screen. Initially, your component may display the desktop view even when the mobile view is expected. This flickering occurs because the state that determines which menu to display is set to a default value.

Example Scenario

Here's a simplified version of what your component code looks like:

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

This code assumes that this.state.isLarge is initially true, meaning the desktop menu will be rendered briefly before the resize event executes and updates the state.

The Solution: Proper State Initialization

To resolve the flickering issue, you'll want to change how you initialize the state in your component. Instead of setting the default state directly to true, you can set it to undefined and then check for this value in the render method.

Revised Code Example

Start by initializing your state with undefined:

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

Next, modify the render method to conditionally display a loading message or the appropriate menu based on the isLarge state:

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

Explanation of the Fix

State Initialization: By setting isLarge to undefined, the component will show a "Loading" message while determining the viewport size.

Conditional Rendering Check: The render method checks if isLarge is undefined before rendering the menus. This prevents the initial flicker of the desktop view, ensuring a smoother user experience.

Conclusion

By making these adjustments to your React component, you can eliminate the flickering of the desktop view on mobile devices and provide a smoother transition between your application’s different layouts. Always remember that managing component state effectively is key to creating responsive and user-friendly applications.

Thank you for reading, and happy coding! If you have any questions or need further clarification on this topic, feel free to leave a comment below.