∞ forever components

Feedback & States

Undo Snackbar

A dark snackbar slides up with an SVG countdown ring draining over 4.2s; clicking UNDO restores the deleted item and flashes a checkmark before dismissing.

cssmedium complexitymoderate motionclick

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When to use it

Destructive-action confirmation flows — delete, archive, move to trash — where users need a brief undo window before the action commits.

When not to

Non-destructive actions or contexts where the auto-cycle demo loop would confuse users — remove the dismiss/loop cycle before shipping in production.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Change DURATION to 6000 for a longer undo window, update --fb12-acc to #818cf8 for an indigo accent, and add a sixth label 'Bookmark deleted' to the labels array. Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.

Safe to edit

  • countdown duration (DURATION=4200)
  • accent color (--fb12-acc)
  • label strings (labels array)
  • ring radius and stroke width (R=12.5, stroke-width=3.4)
  • bar width (min(82%,420px))
  • idle demo cadence (DEMO_UNDO=1500 ms presses UNDO on alternate cycles; resume IDLE_BACK=3600 ms)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • visibilitychange clock-rebasing (t0+=gap, timers[i].due+=gap)
  • IIFE wrapper
  • prefers-reduced-motion static fallback
  • role=status + aria-live on bar
  • idle demo (alternate cycles press UNDO through press(); a real press takes over)
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)

Known limitations

  • Auto-cycles through deletion scenarios by default — remove the dismiss loop and wire real delete logic before production use
  • Countdown uses rAF clock, not CSS, so it cannot be paused via CSS alone

snackbartoastundofeedbackcountdownsvg-ringui-pattern

More Feedback & States components

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  • Error ShakeDark email input shakes horizontally with decaying-sine, border flushes red, X icon pops in with overshoot spring, validation message slides up.
  • Toast StackDark notification toasts spring up from the bottom, drain a colored progress bar, then slide off right. Four types cycle: success, error, warning,…
  • Slide to ConfirmDraggable pill slider fills green on full slide; early release triggers a red shake. Spring physics snap thumb back. Auto-demos with an occasional failure…
  • Hold to ConfirmPress-and-hold fills a tick-marked ring; full hold rotates center square 45° into a green check; early release flashes red cross (cancelled).
  • Empty StateA Bauhaus open vessel sits empty while 26 mint motes drift in a slow orbital cloud above it; poking scatters them and they spring back to settle.