shadcn-ui/apps/v4/examples/base/combobox-groups.tsx

"use client"

import {
  Combobox,
  ComboboxCollection,
  ComboboxContent,
  ComboboxEmpty,
  ComboboxGroup,
  ComboboxInput,
  ComboboxItem,
  ComboboxLabel,
  ComboboxList,
  ComboboxSeparator,
} from "@/examples/base/ui/combobox"

const timezones = [
  {
    value: "Americas",
    items: [
      "(GMT-5) New York",
      "(GMT-8) Los Angeles",
      "(GMT-6) Chicago",
      "(GMT-5) Toronto",
      "(GMT-8) Vancouver",
      "(GMT-3) São Paulo",
    ],
  },
  {
    value: "Europe",
    items: [
      "(GMT+0) London",
      "(GMT+1) Paris",
      "(GMT+1) Berlin",
      "(GMT+1) Rome",
      "(GMT+1) Madrid",
      "(GMT+1) Amsterdam",
    ],
  },
  {
    value: "Asia/Pacific",
    items: [
      "(GMT+9) Tokyo",
      "(GMT+8) Shanghai",
      "(GMT+8) Singapore",
      "(GMT+4) Dubai",
      "(GMT+11) Sydney",
      "(GMT+9) Seoul",
    ],
  },
] as const

export function ComboboxWithGroupsAndSeparator() {
  return (
    <Combobox items={timezones}>
      <ComboboxInput placeholder="Select a timezone" />
      <ComboboxContent>
        <ComboboxEmpty>No timezones found.</ComboboxEmpty>
        <ComboboxList>
          {(group, index) => (
            <ComboboxGroup key={group.value} items={group.items}>
              <ComboboxLabel>{group.value}</ComboboxLabel>
              <ComboboxCollection>
                {(item) => (
                  <ComboboxItem key={item} value={item}>
                    {item}
                  </ComboboxItem>
                )}
              </ComboboxCollection>
              {index < timezones.length - 1 && <ComboboxSeparator />}
            </ComboboxGroup>
          )}
        </ComboboxList>
      </ComboboxContent>
    </Combobox>
  )
}