The answer
Use setInterval. Each tick, calculate: (remaining / total) * 100. Set the progress bar to this percentage. When remaining reaches 0, clear the interval. The bar empties from 100% to 0%.
Progress Bar Use Cases and Real-World Examples
How do you show a countdown timer as a progress bar?
More FAQs in Progress Bar Use Cases and Real-World Examples
File upload (XHR progress event), form completion (filled inputs / total), multi-step wizard (current step / total), loading data (spinner), countdown timer (remaining / total), and scroll progress (scrollTop / scrollHeight).
Use XMLHttpRequest (not fetch, which does not have progress events). Listen for xhr.upload.addEventListener('progress', e => { if (e.lengthComputable) { const percent = (e.loaded / e.total) * 100; setProgress(percent); } }).
Count filled required inputs: const filled = Array.from(inputs).filter(i => i.value).length. Set progress to (filled / total) * 100. Update on every input change.
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