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No.28 · Buttons

Relay

An async button whose states ride a vertical reel — Deploy, Deploying 64%, Live — while its width eases to fit each label and progress runs along its bottom edge.

The prompt

Written for the variant you picked above: Deploy

Build a primary button for a long-running action (shipping a build, generating a file, publishing). Its four states — idle, working, done, error — are rows of one vertical reel inside a 52px window; the reel translates by −index × height over 620ms on cubic-bezier(0.16,1,0.3,1), so the label never cross-fades: forward progress always moves up, a reset moves back down. Inactive rows stay faintly visible as they pass. Each row has its own content: the idle label; a spinner, the working label and a tabular mono percentage; a check that draws itself and the done label; or a small rose badge and the error label. Labels are a prop. Measure every row's natural width with invisible copies (after fonts load) and animate the button's width to the current row's, so the pill always fits its words. Progress is a 2px rail along the bottom edge scaled on X — never over the text. On success the face tints faintly green and the rail fades; on error the face tints rose, the rail stays where it stopped and the label shakes once. Done returns to idle after 2.6s. The action is a prop that reports progress and resolves true or false. Selected variant — Deploy: Deploy (default labels): idle "Deploy to production", working "Deploying" with a percentage, done "Live in 32 regions", error "Build failed — retry"; the demo's first run fails on purpose so the error state is visible. On #0b080d.

Notes

Interaction
Click to run; while working it ignores further clicks; errors can be retried by clicking again.
Motion
Reel 620ms expo-out; width 560ms; rail follows progress (180ms linear); tick draw 420ms; single shake on error.
Accessibility
A real button with aria-busy while working; state changes are announced through a live region; hidden reel rows are aria-hidden. Reduced motion switches states instantly.
Responsive
Width follows its content; labels never wrap.
On touch
Nothing depends on hover.

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301 components