searchable-select.tsx
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"use client";
import * as React from "react";
import { useMemo, useState } from "react";
import { ChevronsUpDown, Search } from "lucide-react";
import { cn } from "./utils";
import { Button } from "./button";
import { Input } from "./input";
import { Popover, PopoverContent, PopoverTrigger } from "./popover";
export type SearchableSelectOption = {
value: string;
label: string;
};
/** 下拉默认可见行数，超出部分滚动 */
const DEFAULT_VISIBLE_LIST_ROWS = 5;
/** 单行高度：py-2 + text-sm 行高 */
const LIST_ROW_PX = 36;
export function SearchableSelect({
value,
onValueChange,
options,
placeholder = "Select…",
searchPlaceholder = "Search…",
emptyText = "No matching results.",
disabled,
className,
/** 顶栏/模板编辑器：与 SelectTrigger !h-7、text-xs 对齐 */
compact = false,
/** 下拉列表可见行数（默认 5 行，其余滚动） */
visibleListRows = DEFAULT_VISIBLE_LIST_ROWS,
}: {
/** 空字符串表示未选择 */
value: string;
onValueChange: (next: string) => void;
options: SearchableSelectOption[];
placeholder?: string;
searchPlaceholder?: string;
emptyText?: string;
disabled?: boolean;
className?: string;
compact?: boolean;
visibleListRows?: number;
}) {
const [open, setOpen] = useState(false);
const [q, setQ] = useState("");
const hit = value ? options.find((o) => o.value === value) : undefined;
const selectedLabel = value ? hit?.label ?? value : null;
const listMaxHeightPx = Math.max(1, visibleListRows) * LIST_ROW_PX;
const filtered = useMemo(() => {
const s = q.trim().toLowerCase();
if (!s) return options;
return options.filter(
(o) => o.label.toLowerCase().includes(s) || o.value.toLowerCase().includes(s),
);
}, [options, q]);
const closePanel = () => {
setOpen(false);
setQ("");
};
return (
<Popover
modal
open={open}
onOpenChange={(next) => {
setOpen(next);
if (!next) setQ("");
}}
>
<PopoverTrigger asChild>
<Button
type="button"
variant="outline"
role="combobox"
aria-expanded={open}
disabled={disabled}
className={cn(
compact
? "w-full justify-between overflow-hidden border border-gray-300 bg-white font-normal shadow-none hover:bg-white"
: "h-10 w-full justify-between overflow-hidden px-3 font-normal border border-gray-300 bg-white",
className,
)}
>
<span
className={cn(
"min-w-0 flex-1 truncate text-left",
compact ? "text-xs leading-tight" : "text-sm",
!selectedLabel && "text-gray-500",
)}
title={selectedLabel ?? placeholder}
>
{selectedLabel ?? placeholder}
</span>
<ChevronsUpDown
className={cn(
"ml-2 shrink-0 opacity-50",
compact ? "h-3 w-3" : "h-4 w-4",
)}
/>
</Button>
</PopoverTrigger>
<PopoverContent
className="w-[var(--radix-popover-trigger-width)] max-w-[min(100vw-2rem,400px)] p-0 overflow-hidden"
align="start"
>
<div className="flex items-center gap-2 border-b border-gray-100 px-2 py-2">
<Search className="h-4 w-4 shrink-0 text-gray-400" />
<Input
value={q}
onChange={(e) => setQ(e.target.value)}
placeholder={searchPlaceholder}
className="h-8 border-0 bg-transparent px-0 text-sm shadow-none focus-visible:ring-0"
/>
</div>
<div
className="overflow-y-auto overscroll-contain p-1 [scrollbar-gutter:stable]"
style={{ maxHeight: listMaxHeightPx }}
>
{filtered.length === 0 ? (
<div className="px-2 py-6 text-center text-sm text-gray-500">{emptyText}</div>
) : (
filtered.map((opt) => (
<button
key={opt.value}
type="button"
className={cn(
"flex w-full min-h-9 cursor-pointer items-center rounded-md px-2 py-2 text-left text-sm transition-colors",
"hover:bg-gray-100 hover:text-gray-900",
value === opt.value && "bg-blue-50 font-medium text-gray-900 hover:bg-blue-100",
)}
onClick={() => {
onValueChange(opt.value);
closePanel();
}}
>
<span className="min-w-0 flex-1 truncate">{opt.label}</span>
</button>
))
)}
</div>
{value ? (
<div className="border-t border-gray-100 px-2 py-1.5">
<button
type="button"
className="text-xs text-gray-500 hover:text-gray-900 underline-offset-2 hover:underline"
onClick={() => {
onValueChange("");
closePanel();
}}
>
Clear selection
</button>
</div>
) : null}
</PopoverContent>
</Popover>
);
}