Your useOptimistic UI Might Be Lying to Users When the Server Action Actually Fails
useOptimistic is genuinely one of the nicer additions to React for making an app feel fast, updating the UI immediately while the real request happens in the background. It's also very easy to implement in a way that only handles the success path, leaving the UI confidently showing something that never actually happened once the request fails. The Setup That Looks Complete //…
useOptimistic is a welcome addition to React, making apps feel speedy by updating the UI immediately while the real request happens in the background. However, this feature can lead to confusion when the server action fails. In a TodoItem component, using useOptimistic to show an item as completed might seem straightforward, but it only handles the success path. If the server action fails silently, the optimistic UI gives the false impression of success before reverting, leaving users puzzled.
To fix this, we can add error handling to the handleToggle function. This involves initializing a state variable for error messages and checking the result of the server action. If the action fails, we update the error state with a descriptive message. The UI then displays this error message to the user, preventing the confusion of a successful toggle followed by a quick revert. This approach ensures users understand what went wrong, making the optimistic UI feature more reliable and user-friendly.
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