# Line with drilldown (Line example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/line/line-with-drilldown/ · Index for agents: https://westcoast-charts.com/llms.txt

Click a year to drill into its months; the breadcrumb or Backspace goes back.

- Chart type: `line` (Line)
- Collection: Line · Line
- Raw configuration: https://westcoast-charts.com/gallery-src/line/line-with-drilldown.js
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/line/line-with-drilldown.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'
import drilldown from 'west-coast-charts/features/drilldown'

WestCoastCharts.use(types).use(drilldown)
```

## Options

```js
const options = {
  chart: {
    height: 380,
    fontFamily: "Inter, Geist, \"IBM Plex Sans\", system-ui, sans-serif",
    type: "line",
    toolbar: {
      show: false
    }
  },
  series: [
    {
      name: "Revenue k€",
      data: [
        {
          x: "2022",
          y: 872,
          drilldown: "y2022"
        },
        {
          x: "2023",
          y: 866,
          drilldown: "y2023"
        },
        {
          x: "2024",
          y: 858,
          drilldown: "y2024"
        },
        {
          x: "2025",
          y: 823,
          drilldown: "y2025"
        },
        {
          x: "2026",
          y: 852,
          drilldown: "y2026"
        }
      ]
    }
  ],
  stroke: {
    width: 3
  },
  markers: {
    size: 6
  },
  drilldown: {
    enabled: true,
    series: [
      {
        id: "y2022",
        name: "2022 by month",
        data: [
          {
            x: "Jan",
            y: 55
          },
          {
            x: "Feb",
            y: 67
          },
          {
            x: "Mar",
            y: 83
          },
          {
            x: "Apr",
            y: 55
          },
          {
            x: "May",
            y: 85
          },
          {
            x: "Jun",
            y: 101
          },
          {
            x: "Jul",
            y: 115
          },
          {
            x: "Aug",
            y: 66
          },
          {
            x: "Sep",
            y: 52
          },
          {
            x: "Oct",
            y: 76
          },
          {
            x: "Nov",
            y: 48
          },
          {
            x: "Dec",
            y: 67
          }
        ]
      },
      {
        id: "y2023",
        name: "2023 by month",
        data: [
          {
            x: "Jan",
            y: 96
          },
          {
            x: "Feb",
            y: 104
          },
          {
            x: "Mar",
            y: 55
          },
          {
            x: "Apr",
            y: 94
          },
          {
            x: "May",
            y: 77
          },
          {
            x: "Jun",
            y: 49
          },
          {
            x: "Jul",
            y: 70
          },
          {
            x: "Aug",
            y: 63
          },
          {
            x: "Sep",
            y: 44
          },
          {
            x: "Oct",
            y: 64
          },
          {
            x: "Nov",
            y: 99
          },
          {
            x: "Dec",
            y: 50
          }
        ]
      },
      {
        id: "y2024",
        name: "2024 by month",
        data: [
          {
            x: "Jan",
            y: 49
          },
          {
            x: "Feb",
            y: 77
          },
          {
            x: "Mar",
            y: 81
          },
          {
            x: "Apr",
            y: 101
          },
          {
            x: "May",
            y: 64
          },
          {
            x: "Jun",
            y: 57
          },
          {
            x: "Jul",
            y: 44
          },
          {
            x: "Aug",
            y: 65
          },
          {
            x: "Sep",
            y: 56
          },
          {
            x: "Oct",
            y: 86
          },
          {
            x: "Nov",
            y: 99
          },
          {
            x: "Dec",
            y: 80
          }
        ]
      },
      {
        id: "y2025",
        name: "2025 by month",
        data: [
          {
            x: "Jan",
            y: 63
          },
          {
            x: "Feb",
            y: 73
          },
          {
            x: "Mar",
            y: 53
          },
          {
            x: "Apr",
            y: 49
          },
          {
            x: "May",
            y: 75
          },
          {
            x: "Jun",
            y: 63
          },
          {
            x: "Jul",
            y: 92
          },
          {
            x: "Aug",
            y: 62
          },
          {
            x: "Sep",
            y: 61
          },
          {
            x: "Oct",
            y: 64
          },
          {
            x: "Nov",
            y: 77
          },
          {
            x: "Dec",
            y: 90
          }
        ]
      },
      {
        id: "y2026",
        name: "2026 by month",
        data: [
          {
            x: "Jan",
            y: 59
          },
          {
            x: "Feb",
            y: 88
          },
          {
            x: "Mar",
            y: 95
          },
          {
            x: "Apr",
            y: 60
          },
          {
            x: "May",
            y: 43
          },
          {
            x: "Jun",
            y: 103
          },
          {
            x: "Jul",
            y: 51
          },
          {
            x: "Aug",
            y: 49
          },
          {
            x: "Sep",
            y: 95
          },
          {
            x: "Oct",
            y: 71
          },
          {
            x: "Nov",
            y: 61
          },
          {
            x: "Dec",
            y: 77
          }
        ]
      }
    ],
    animation: {
      zoomFromPoint: true
    }
  },
  title: {
    text: "Revenue by year (click a point)"
  },
  theme: {
    mode: "light",
    preset: "coastal"
  }
}

const chart = new WestCoastCharts(document.querySelector('#chart'), options)
await chart.render()
```

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export line-line-with-drilldown.json --out line-line-with-drilldown.svg --with-table` (save the options above as JSON first)