The CSS transition fails to function correctly when rendering a React element within an array

When rendering a React component within an array using CSS transitions, I noticed that the elements in the array re-order and change style. Surprisingly, only the elements moving up have transitions applied, while the ones moving down do not. I expect all elements that undergo styling changes after rendering to retain their transitions.

If you'd like to take a look at the issue, here is the CodeSandbox link: https://codesandbox.io/s/youthful-fire-9zrc4

Any help would be greatly appreciated. Thank you in advance!

javascriptcssreactjscss-transitions

Answer №1

The incorrect key parameter is causing issues. When the key changes, React reorganizes the entire DOM, disrupting animations. Please update key={opt.name} on line 6 to key={i}

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