Скачать или смотреть Fixing Material UI ES6 Custom Styled Text Field Losing Focus on Input

Learn how to resolve the issue of a `Material UI` custom styled text field losing focus when typing in `React`. Keep your input fields responsive with these effective solutions!
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This video is based on the question https://stackoverflow.com/q/77119915/ asked by the user 'Yusuf Mirza' ( https://stackoverflow.com/u/20726739/ ) and on the answer https://stackoverflow.com/a/77119928/ provided by the user 'Ori Drori' ( https://stackoverflow.com/u/5157454/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing Material UI ES6 Custom Styled Text Field Losing Focus on Input

When developing user interfaces in React using Material UI, you might encounter some unexpected issues. One such common problem is when a custom styled text field loses focus while typing. This can be frustrating, especially if everything else is functioning correctly. In this guide, we’ll explore the root cause of this issue and provide a clear, actionable solution.

Understanding the Problem

The problem arises when using the styled function from Material UI to customize a TextField component. If the customization is done incorrectly, you may find that every time you type in the text field, it loses focus. This is likely due to the component being re-rendered unnecessarily, which React does when it thinks the component’s structure has changed.

Symptoms

Input field loses focus when typing in it

Input behaves as if it is being re-rendered on every keystroke

Initial Setup

Consider the following simple form setup:

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

Your custom field might look something like this:

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

Here, StyledField is defined inside the CustomField component. Thus, on every render, a new component is created.

Solution: Move the Styled Component Outside

To fix this issue, you should define the styled component outside of your functional component. Moving the StyledField outside prevents it from being recreated during each render, which allows React to maintain the focus state of the input field.

Revised Custom Field Component

Here’s how to update your CustomField component correctly:

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

Explanation of Changes

Define Styled Component Outside: By declaring StyledField outside of the CustomField function, we ensure that it is not re-created on every render.

Maintain Focus State: This approach allows the input field to keep its focus while the onChange event is being processed, providing a smoother user experience.

Conclusion

The issue of losing focus in a custom styled TextField in Material UI is frustrating but easily resolvable. By properly positioning your styled components outside of render functions, you can ensure consistent behavior of your input fields during interactions. This small but significant change can vastly improve the usability of forms in your React applications. Happy coding!