shadcn/app/registry/default/charts/chart-line-label-custom.tsx

"use client"

import { TrendingUp } from "lucide-react"
import { CartesianGrid, LabelList, Line, LineChart } from "recharts"

import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/registry/default/ui/card"
import {
  ChartConfig,
  ChartContainer,
  ChartTooltip,
  ChartTooltipContent,
} from "@/registry/default/ui/chart"

export const description = "A line chart with a custom label"

const chartData = [
  { browser: "chrome", visitors: 275, fill: "var(--color-chrome)" },
  { browser: "safari", visitors: 200, fill: "var(--color-safari)" },
  { browser: "firefox", visitors: 187, fill: "var(--color-firefox)" },
  { browser: "edge", visitors: 173, fill: "var(--color-edge)" },
  { browser: "other", visitors: 90, fill: "var(--color-other)" },
]

const chartConfig = {
  visitors: {
    label: "Visitors",
    color: "hsl(var(--chart-2))",
  },
  chrome: {
    label: "Chrome",
    color: "hsl(var(--chart-1))",
  },
  safari: {
    label: "Safari",
    color: "hsl(var(--chart-2))",
  },
  firefox: {
    label: "Firefox",
    color: "hsl(var(--chart-3))",
  },
  edge: {
    label: "Edge",
    color: "hsl(var(--chart-4))",
  },
  other: {
    label: "Other",
    color: "hsl(var(--chart-5))",
  },
} satisfies ChartConfig

export default function Component() {
  return (
    <Card>
      <CardHeader>
        <CardTitle>Line Chart - Custom Label</CardTitle>
        <CardDescription>January - June 2024</CardDescription>
      </CardHeader>
      <CardContent>
        <ChartContainer config={chartConfig}>
          <LineChart
            accessibilityLayer
            data={chartData}
            margin={{
              top: 24,
              left: 24,
              right: 24,
            }}
          >
            <CartesianGrid vertical={false} />
            <ChartTooltip
              cursor={false}
              content={
                <ChartTooltipContent
                  indicator="line"
                  nameKey="visitors"
                  hideLabel
                />
              }
            />
            <Line
              dataKey="visitors"
              type="natural"
              stroke="var(--color-visitors)"
              strokeWidth={2}
              dot={{
                fill: "var(--color-visitors)",
              }}
              activeDot={{
                r: 6,
              }}
            >
              <LabelList
                position="top"
                offset={12}
                className="fill-foreground"
                fontSize={12}
                dataKey="browser"
                formatter={(value: any) =>
                  chartConfig[value as keyof typeof chartConfig]?.label
                }
              />
            </Line>
          </LineChart>
        </ChartContainer>
      </CardContent>
      <CardFooter className="flex-col items-start gap-2 text-sm">
        <div className="flex gap-2 font-medium leading-none">
          Trending up by 5.2% this month <TrendingUp className="h-4 w-4" />
        </div>
        <div className="leading-none text-muted-foreground">
          Showing total visitors for the last 6 months
        </div>
      </CardFooter>
    </Card>
  )
}