Progress Bar: Complete Interview Checklist
The complete checklist for building a progress bar in a machine coding interview.
Progress Bar: Complete Interview Checklist
Here is the complete checklist for building a progress bar in a machine coding interview.
Core Features
- Container div (background gray, border-radius, overflow hidden).
- Fill div (background color, width based on percentage).
- CSS transition for smooth animation.
- Set width via JavaScript (bar.style.width = percent + "%").
- Clamp to 0-100 (Math.max(0, Math.min(100, percent))).
- Percentage display.
Advanced Features
- Auto-increment (setInterval, clearInterval at 100).
- Color based on progress (red, yellow, green).
- Circular progress bar (SVG, stroke-dashoffset).
- Striped animation for indeterminate progress.
- Buttons to increase/decrease/reset.
Accessibility
- role="progressbar".
- aria-valuenow (update via JS).
- aria-valuemin="0", aria-valuemax="100".
- aria-label (description).
CSS
- Gradient background.
- Border-radius on container and fill.
- Overflow: hidden on container.
- Transition: width 0.3s ease.
- Hover states (if interactive).
- Responsive (width 100%, max-width).
Testing
- Test: set to 0%, 50%, 100%.
- Test: auto-increment reaches 100.
- Test: values above 100 are clamped.
- Test: values below 0 are clamped.
- Test: animation is smooth.
The Takeaway
Checklist: core (container, fill, transition, clamp, percentage), advanced (auto-increment, color, circular, stripes, buttons), accessibility (ARIA), CSS (gradient, border-radius, transition, responsive), and testing (0%, 50%, 100%, clamping, smooth animation).
Core (container, fill, CSS transition, clamp 0-100, percentage display), advanced (auto-increment, color-based, circular, stripes, buttons), accessibility (role, aria-valuenow, aria-label), CSS (gradient, border-radius, transition, responsive), and testing (0%, 50%, 100%, clamping, smooth animation).
A container div, a fill div whose width is set by JavaScript, CSS transition for smooth animation, clamping to 0-100, and a percentage display. These are the minimum required features.
Auto-increment (setInterval), color based on progress (red/yellow/green), circular progress bar (SVG), striped animation for indeterminate, and buttons to increase/decrease/reset. These show depth.
Container: background gray, border-radius, overflow hidden. Fill: background color or gradient, transition: width 0.3s ease. Optional: border-radius on fill, box-shadow for glow, striped pattern for indeterminate.
Test setting to 0%, 50%, 100%. Test auto-increment reaches 100 and stops. Test values above 100 are clamped to 100. Test values below 0 are clamped to 0. Test that the animation is smooth (no jerky movements).
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