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defuss-shadcn / Website / Shop / discount-form

Built with: CSS

Discount FormBLK

Accepts a promotional code and displays its application result - the field, the error when it fails, and the applied code with its saving. Part of the Shop blocks.

On this page (5)
Component Skill — components/discount-form/component-skill.md

Native basis

A <form>: a labelled Input (pattern, required, aria-describedby → the error) and an Apply Button. A failed check from the server sets aria-invalid="true"; success renders .mk-discount-form-applied (role="status") with the code, the saving and a remove button.

Built from

Input, Label, Button.

Web Platform APIs

Constraint validation:user-invalid:has()<details>

Classes

.mk-discount-form.mk-discount-form-row.mk-discount-form-error.mk-discount-form-applied

Data attributes

aria-invalid="true" on the input for a server error; data-variant="collapsed" for the disclosure.

§Default

Label, field and Apply. The field checks its own format (pattern, required): submit it empty or with "A!" to see :user-invalid show the message.

§Rejected

The server rejected the code: it sets aria-invalid="true" - the field turns red and the message reads with it. The typed code stays so people can fix it.

§Applied

.mk-discount-form-applied: the code as a dashed green chip with the saving, announced via role="status", and a labelled remove button.

§Collapsed

data-variant='collapsed': the form behind a "Have a discount code?" <details> - out of the way until wanted.

§CSS view file

/* -- Discount Form (website · Shop) ---------------------------------------
   Accepts a promotional code and displays its application result - the field, the error when it fails, and the applied code with its saving. */
@layer components {
  /* every box in the block measures border-box - the same on any page */
  :where(.mk-discount-form, .mk-discount-form *, .mk-discount-form ::before, .mk-discount-form ::after) {
    box-sizing: border-box;
  }
  .mk-discount-form {
    display: grid;
    gap: 0.5rem;
    max-width: 26rem;
    margin: 0;
  }
  .mk-discount-form-row {
    display: flex;
    gap: 0.5rem;
    & .input {
      flex: 1;
      min-width: 0;
      font-family: var(--font-mono);
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }
    & .input::placeholder {
      text-transform: none;
      letter-spacing: 0;
      font-family: var(--font-sans);
    }
  }
  .mk-discount-form-error {
    display: none;
    align-items: center;
    gap: 0.375rem;
    margin: 0;
    color: var(--destructive);
    font-size: 0.8125rem;
    font-weight: 500;
    & svg {
      flex: none;
      width: 0.875rem;
      height: 0.875rem;
    }
  }
  .mk-discount-form:has(.input:user-invalid, .input[aria-invalid="true"]) .mk-discount-form-error {
    display: flex;
  }
  .mk-discount-form .input[aria-invalid="true"] {
    border-color: var(--destructive);
  }
  .mk-discount-form-applied {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 26rem;
    padding: 0.625rem 0.5rem 0.625rem 0.875rem;
    border: 1px dashed color-mix(in oklab, #16a34a 50%, var(--border));
    border-radius: var(--radius-lg);
    background: color-mix(in oklch, #16a34a 7%, transparent);
    font-size: 0.875rem;
    & > svg {
      flex: none;
      width: 1rem;
      height: 1rem;
      color: #15803d;
    }
    & code {
      font-family: var(--font-mono);
      font-weight: 700;
      letter-spacing: 0.06em;
    }
    & span {
      flex: 1;
      color: var(--muted-foreground);
    }
    & strong {
      color: #15803d;
      font-variant-numeric: tabular-nums;
    }
    & button {
      display: grid;
      place-items: center;
      width: 1.75rem;
      height: 1.75rem;
      padding: 0;
      border: 0;
      border-radius: var(--radius-sm);
      background: transparent;
      color: var(--muted-foreground);
      cursor: pointer;
    }
    & button:hover {
      background: var(--accent);
      color: var(--foreground);
    }
    & button:focus-visible {
      outline: 2px solid var(--ring);
      outline-offset: 1px;
    }
    & button svg {
      width: 0.875rem;
      height: 0.875rem;
    }
  }
  .mk-discount-form[data-variant="collapsed"] {
    & summary {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      cursor: pointer;
      list-style: none;
    }
    & summary::-webkit-details-marker {
      display: none;
    }
    & summary svg {
      width: 0.875rem;
      height: 0.875rem;
      transition: rotate 150ms ease;
    }
    &[open] summary svg {
      rotate: 45deg;
    }
    & summary:focus-visible {
      outline: 2px solid var(--ring);
      outline-offset: 2px;
      border-radius: var(--radius-sm);
    }
    & .mk-discount-form {
      margin-block-start: 0.75rem;
    }
  }
  /* -- Accessibility ------------------------------------------- */
  @media (prefers-reduced-motion: reduce) {
    .mk-discount-form[data-variant="collapsed"] summary svg {
      transition: none;
    }
  }
  @media (forced-colors: active) {
    .mk-discount-form-applied {
      border-color: CanvasText;
    }
  }
}

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