Why does form data disappear when switching tabs in a multi-step form?
Because the data is not persisted. The inputs are re-created on each step render, and their values are lost. Fix: store all data in a single object (formData), update on every input change, and set input values from this object on render.
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More FAQs in Tab Form Common Mistakes and Fixes
Validate the current step before allowing next: check all required fields. If any is empty, show an error and prevent navigation. Only allow next if all required fields are filled.
Show the submit button only on the last step (currentStep === steps.length - 1). Hide the next button on the last step. On submit, validate the last step and call the submit callback with all form data.
No. Hide the prev button when currentStep === 0. There is nothing to go back to. Showing a disabled or non-functional prev button is confusing.
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