How do I create a gantt chart in JavaScript?

Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'gantt' }, series: [...] }).

Why does my gantt chart render as a line chart?

The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type " ", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.

Why do I get "Cannot read properties of null (reading 'appendChild')"?

The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.

Why is the chart rendering with zero height?

The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

Other

Gantt

type: 'gantt'

Horizontal time-based bars showing task durations and dependencies.

Edit the JSON on the right and press Run (or ⌘/Ctrl + Enter) — data, titles, categories and colors all update live.

Live

Gantt

Edit · JSON

Data format

{ name, start: number, end: number, color? }

Data shape

The JSON you pass inside the chart — drop it straight into your series.

data: [
  { name: 'Research', start: 0, end: 2 },
  { name: 'Design', start: 2, end: 5 },
  { name: 'Build', start: 4, end: 9 }
]

Example

import KatuCharts from 'katucharts.js';

KatuCharts.chart('container', {
  chart: { type: 'gantt' },
  series: [{
    data: [
      { name: 'Research', start: 0, end: 2 },
      { name: 'Design', start: 2, end: 5 },
      { name: 'Build', start: 4, end: 9 }
    ]
  }]
});

Type-specific options

Option	Description
`dependency`	Link tasks by id.
`progress`	Completion fraction (0–1).

Variations

Progress & dependencies

Fill each bar to its completion and link tasks with dependency.

KatuCharts.chart('container', {
  chart: { type: 'gantt' },
  series: [{
    data: [
      { id: 'design', name: 'Design', start: 2, end: 5, progress: 0.7 },
      { id: 'build',  name: 'Build',  start: 4, end: 9, progress: 0.4, dependency: 'design' }
    ]
  }]
});

Common errors

Why does my gantt chart render as a line chart?: The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?: The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?: The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

FAQ

How do I create a gantt chart in JavaScript?: Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'gantt' }, series: [...] }).
Why does my gantt chart render as a line chart?: The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
Why do I get "Cannot read properties of null (reading 'appendChild')"?: The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
Why is the chart rendering with zero height?: The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.

Common options (color, visible, marker, dataLabels, animation, events, zones…) apply to every type — see Configuration → series. See it rendered in the gallery.