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

"use client"

import * as React from "react"
import { Button } from "@/examples/base/ui/button"
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
} from "@/examples/base/ui/command"
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/examples/base/ui/popover"
import { Check, ChevronsUpDown } from "lucide-react"

import { cn } from "@/lib/utils"

const frameworks = [
  {
    value: "next.js",
    label: "Next.js",
  },
  {
    value: "sveltekit",
    label: "SvelteKit",
  },
  {
    value: "nuxt.js",
    label: "Nuxt.js",
  },
  {
    value: "remix",
    label: "Remix",
  },
  {
    value: "astro",
    label: "Astro",
  },
]

export default function ComboboxDemo() {
  const [open, setOpen] = React.useState(false)
  const [value, setValue] = React.useState("")

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger
        render={
          <Button
            variant="outline"
            role="combobox"
            aria-expanded={open}
            className="w-[200px] justify-between"
          />
        }
      >
        {value
          ? frameworks.find((framework) => framework.value === value)?.label
          : "Select framework..."}
        <ChevronsUpDown className="opacity-50" />
      </PopoverTrigger>
      <PopoverContent className="w-[200px] p-0">
        <Command>
          <CommandInput placeholder="Search framework..." className="h-9" />
          <CommandList>
            <CommandEmpty>No framework found.</CommandEmpty>
            <CommandGroup>
              {frameworks.map((framework) => (
                <CommandItem
                  key={framework.value}
                  value={framework.value}
                  onSelect={(currentValue) => {
                    setValue(currentValue === value ? "" : currentValue)
                    setOpen(false)
                  }}
                >
                  {framework.label}
                  <Check
                    className={cn(
                      "ml-auto",
                      value === framework.value ? "opacity-100" : "opacity-0"
                    )}
                  />
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  )
}