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Select

A custom dropdown select control powered by Radix UI Select primitive. Supports option grouping, custom triggers, size scales, and full keyboard navigation.

select.tsx

Core implementation of the Select component.

ReactRadix UITailwindForms
"use client";

import * as React from "react";
import * as SelectPrimitive from "@radix-ui/react-select";
import { Check, ChevronDown, ChevronUp } from "lucide-react";
import { cn } from "@/lib/utils";
import { designRadius } from "@/lib/design-system";

export interface SelectProps extends React.ComponentPropsWithoutRef<typeof SelectPrimitive.Root> {
  label?: React.ReactNode;
  placeholder?: string;
  description?: React.ReactNode;
  errorMessage?: React.ReactNode;
  isInvalid?: boolean;
  size?: "sm" | "md" | "lg";
  radius?: keyof typeof designRadius;
  className?: string;
  children?: React.ReactNode;
}

const Select = SelectPrimitive.Root;
const SelectGroup = SelectPrimitive.Group;
const SelectValue = SelectPrimitive.Value;

const sizeMap = {
  sm: "h-8 px-2.5 text-xs",
  md: "h-10 px-3 text-sm",
  lg: "h-12 px-4 text-base",
};

const SelectTrigger = React.forwardRef<
  React.ComponentRef<typeof SelectPrimitive.Trigger>,
  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Trigger> & {
    size?: "sm" | "md" | "lg";
    radius?: keyof typeof designRadius;
    isInvalid?: boolean;
  }
>(({ className, children, size = "md", radius = "lg", isInvalid, ...props }, ref) => (
  <SelectPrimitive.Trigger
    ref={ref}
    className={cn(
      "flex w-full items-center justify-between border border-input bg-background shadow-xs ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 cursor-pointer",
      sizeMap[size],
      designRadius[radius],
      isInvalid && "border-danger focus:ring-danger text-danger",
      className
    )}
    {...props}
  >
    {children}
    <SelectPrimitive.Icon asChild>
      <ChevronDown className="size-4 opacity-50 shrink-0" />
    </SelectPrimitive.Icon>
  </SelectPrimitive.Trigger>
));
SelectTrigger.displayName = SelectPrimitive.Trigger.displayName;

const SelectContent = React.forwardRef<
  React.ComponentRef<typeof SelectPrimitive.Content>,
  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Content>
>(({ className, children, position = "popper", ...props }, ref) => (
  <SelectPrimitive.Portal>
    <SelectPrimitive.Content
      ref={ref}
      className={cn(
        "relative z-50 max-h-96 min-w-[8rem] overflow-hidden rounded-xl border border-border bg-popover text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2",
        position === "popper" &&
          "data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
        className
      )}
      position={position}
      {...props}
    >
      <SelectPrimitive.Viewport
        className={cn(
          "p-1",
          position === "popper" &&
            "h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)]"
        )}
      >
        {children}
      </SelectPrimitive.Viewport>
    </SelectPrimitive.Content>
  </SelectPrimitive.Portal>
));
SelectContent.displayName = SelectPrimitive.Content.displayName;

const SelectLabel = React.forwardRef<
  React.ComponentRef<typeof SelectPrimitive.Label>,
  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Label>
>(({ className, ...props }, ref) => (
  <SelectPrimitive.Label
    ref={ref}
    className={cn("py-1.5 pl-8 pr-2 text-xs font-semibold text-muted-foreground", className)}
    {...props}
  />
));
SelectLabel.displayName = SelectPrimitive.Label.displayName;

const SelectItem = React.forwardRef<
  React.ComponentRef<typeof SelectPrimitive.Item>,
  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Item>
>(({ className, children, ...props }, ref) => (
  <SelectPrimitive.Item
    ref={ref}
    className={cn(
      "relative flex w-full cursor-pointer select-none items-center rounded-lg py-2 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50",
      className
    )}
    {...props}
  >
    <span className="absolute left-2 flex size-3.5 items-center justify-center">
      <SelectPrimitive.ItemIndicator>
        <Check className="size-4 text-primary" />
      </SelectPrimitive.ItemIndicator>
    </span>
    <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
  </SelectPrimitive.Item>
));
SelectItem.displayName = SelectPrimitive.Item.displayName;

const SelectSeparator = React.forwardRef<
  React.ComponentRef<typeof SelectPrimitive.Separator>,
  React.ComponentPropsWithoutRef<typeof SelectPrimitive.Separator>
>(({ className, ...props }, ref) => (
  <SelectPrimitive.Separator
    ref={ref}
    className={cn("-mx-1 my-1 h-px bg-muted", className)}
    {...props}
  />
));
SelectSeparator.displayName = SelectPrimitive.Separator.displayName;

export {
  Select,
  SelectGroup,
  SelectValue,
  SelectTrigger,
  SelectContent,
  SelectLabel,
  SelectItem,
  SelectSeparator,
};

Basic Usage

Standard dropdown select.

API Reference

Props — Select

Properties to configure the Select trigger component.

PropTypeDefaultDescription
size'sm' | 'md' | 'lg''md'Height and padding scale for SelectTrigger.
isInvalidbooleanfalseApplies error state border and text styling.