How do you animate a progress bar smoothly in JavaScript?
Use CSS transition on the width property: transition: width 0.3s ease. When you change the width via JavaScript, the CSS transition animates the change smoothly. No requestAnimationFrame needed.
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More FAQs in Building a Progress Bar Component: A Complete Guide
Create a container div (background gray) and an inner fill div. Set the fill's width to a percentage. Use CSS transition: width 0.3s ease for smooth animation. Clamp the value to 0-100. Display the percentage.
Use SVG with two circles. The background circle has a gray stroke. The progress circle uses stroke-dasharray (circumference) and stroke-dashoffset (circumference - percent/100 * circumference). Rotate -90 degrees so it starts at the top.
Use setInterval: const interval = setInterval(() => { progress += 1; setProgress(progress); if (progress >= 100) clearInterval(interval); }, 100). This increments by 1 every 100ms until it reaches 100.
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