A lightweight and fast interactive gantt chart/resource booking component made with Svelte. Compatible with any JS library or framework. ZERO dependencies.

Features include: Large datasets, drag'n'drop, tree view, zooming in/out, dependencies, date ranges...

DEMO: Large dataset, Tree, Dependencies


npm install svelte-gantt

Use ES6 imports in your code:

import { SvelteGantt, SvelteGanttTable } from 'svelte-gantt';

or use the IIFE build:

<script src="node_modules/svelte-gantt/index.iife.js"></script>
  1. Initialize svelte-gantt:
var options = {
    /* ... */

var gantt = new SvelteGantt({
    // target a DOM element
    target: document.getElementById('example-gantt'),
    // svelte-gantt options
    props: options

..or run the example by opening ./public/index.html

Migrating from version 3.x.x-4.x.x

svelte-gantt no longer requires moment. You can still use it as MomentSvelteGanttDateAdapter. All parameters that were previously moment objects became numbers (milliseconds since UNIX epoch).

ALL date parameters should be UNIX timestamps (JavaScript Date and moment objects will still work in most of the cases).

Date parameters can stay moment or JavaScript Date objects because they will be transformed to UNIX timestamps.

CSS is now injected so no need to include svelteGantt.css in your HTML.


Pass options object as props to the SvelteGantt constructor. To update use $set, eg.

    from: moment().startOf('week').valueOf(),
    to: moment().endOf('week').valueOf()
  • rows {Array} Rows to load in the gantt, see below.

  • tasks {Array} Tasks that display in the gantt, see below.

  • timeRanges {Array} Timeranges that display in the gantt, see below.

  • dependencies {Array} Dependencies that display in the gantt, used with the SvelteGanttDependencies module, see below.

  • from {Moment} Datetime timeline starts on.

  • to {Moment} Datetime timeline ends on.

  • minWidth {Number} Minimum width of gantt area in px.

  • fitWidth {Boolean} Should timeline stretch width to fit.

  • highlightedDurations {Object} Pattern for highlighting durations, see below.

  • highlightColor {String} Highlight color (for use with highlightedDurations).

  • magnetUnit {String} Minimum unit of time task date values will round to.

  • magnetOffset {Number} Amount of units task date values will round to.

  • columnUnit {String} Duration unit of columns.

  • columnOffset {Number} Duration width of column.

    • eg. columnUnit: 'minute', columnOffset: 15 will create a column for every 15 minutes.
  • headers {Array} List of headers used for main gantt area.

  • dateAdapter {Object} A date adapter is an object of interface { format(date: number, format: string): string; } that formats a date in UNIX miliseconds to a string using the specified format template, eg. 'MMMM Do'.

  • zoomLevels {Array} List of zoom levels for gantt. Gantt cycles trough these parameters on ctrl+scroll.

  • rowHeight {Number} Height of a single row in px.

  • rowPadding {Number} Padding of a single row in px.

  • ganttTableModules {Array} Modules used in gantt table area.

    • eg. [SvelteGanttTable]
  • ganttBodyModules {Array} Modules used in gantt body area.

    • eg. [SvelteGanttDependencies]
  • reflectOnParentRows {Boolean} When task is assigned to a child row display them on parent rows as well, used when rows are disabled as a tree.

  • reflectOnChildRows {Boolean} When task is assigned to a parent row display them on child rows as well, used when rows are disabled as a tree.

  • classes {String|Array} Custom CSS classes to apply to gantt.

  • resizeHandleWidth {Number} Width of handle for resizing tasks, in px.

  • onTaskButtonClick {Function} Callback for task button clicks.

    • eg. (task) => console.log('clicked on: ', task)
  • taskContent {Function} ,task content factory function.

    • eg. (task) => `<div>Task ${task.model.label}</div>`
  • taskElementHook {Function} ,task element hook function, it is a svelte action.

    • eg. (node, task) => { node.addEventListener('click', console.log); return { destroy() { node.removeEventListener('click', console.log); } }; }
  • tableWidth {Number} Width of table, used with SvelteGanttTable module.

  • tableHeaders {Array} Headers of table, used with SvelteGanttTable module.

  • columnStrokeColor {string} Color of column lines.

    • eg. '#efefef'
  • columnStrokeWidth {number} Width of column lines.

  • layout {'overlap', 'pack'} The layout used to arrange tasks in a row.

    • 'overlap' Overlapping tasks display one over another (default).
    • 'pack' Overlapping tasks shrink and display one above another.
  • enableCreateTask {Boolean} Enables creating new tasks by dragging.

  • onCreateTask {({ from: number; to: number; resourceId: string | number; }) => TaskModel} This function provides the new task model when dragging to create task.

  • onCreatedTask {(task: SvelteTask) => void} Called after task was created by dragging.

Represents a row of header cells that render over the gantt.

  • unit {String} Time unit used to display header cells.
    • eg. 'day' will create a cell in the header for each day in the timeline.
  • format {String} Datetime format used to label header cells.
    • eg. 'DD.MM.YYYY', 'HH'
  • offset {Number} Duration width of header cell.
  • sticky {Boolean} Use sticky positioning for header labels.


By default svelte-gantt is only able to format a small set of date templates, eg. 'HH:mm'. For more you can use MomentSvelteGanttDateAdapter as dateAdapter or a custom one, as long as it implements the interface { format(date: number, format: string): string; }.

import { MomentSvelteGanttDateAdapter } from 'svelte-gantt';
import moment from 'Moment';

const ganttOptions = {
    dateAdapter = new MomentSvelteGanttDateAdapter(moment)

Table Header

Represents a single column rendered in SvelteGanttTable.

  • title {String} Label to display in the table column header.
  • property {String} Property of row to display in table column cells.
  • width {Number} Width of table column, in px.

Zoom level

Represents a zoom level which cycle on ctrl+scroll.

  • headers {Array} See above.
  • minWidth {Number} See above.
  • fitWidth {Boolean} See above.


Rows are defined as a list of objects. Rows can be rendered as a collapsible tree (rows are collapsed with SvelteGanttTable module). Row objects may have these parameters:

  • id {Number|String} Id of row, every row needs to have a unique one.
  • classes {String|Array} Custom CSS classes to apply to row.
  • contentHtml {String} Html content of row, renders as background to a row.
  • enableDragging {Boolean} enable dragging of tasks to and from this row.
  • enableResize {Boolean} enable resize of tasks on this row.
  • label {String} Label of row, could be any other property, can be displayed with SvelteGanttTable.
  • headerHtml {String} Html content of table row header, displayed in SvelteGanttTable.
  • children {Array} List of children row objects, these can have their own children.
  • expanded {Boolean} {optional} Used when tree view is enabled, controls the expanded state.


Tasks are defined as a list of objects:

  • id {Number|String} Id of task, every task needs to have a unique one.
  • amountDone {Number} Task completion in percent, indicated on task.
  • classes {String|Array} Custom CSS classes to apply to task.
  • from {number} Datetime task starts on.
  • to {number} Datetime task ends on.
  • label {String} Label of task.
  • html {String} Html content of task, will override label.
  • showButton {Boolean} Show button bar.
  • buttonClasses {String|Array} Button classes, useful for fontawesome icons.
  • buttonHtml {String} Html content of button.
  • enableDragging {Boolean} enable dragging of task.
  • enableResize {Boolean} enable resize of task.


Renders a dependency between two tasks. Used by SvelteGanttDependencies module:

  • id {Number|String} Unique id of dependency.
  • fromId {Number|String} Id of dependent task.
  • toId {Number|String} Id of dependency task.
  • stroke {String} Stroke color.
    • eg. 'red' or '#ff0000'
  • strokeWidth {Number} Width of stroke.
  • arrowSize {Number} Size of the arrow head.

Time ranges

Renders a block of time spanning all the rows:

  • id {Number|String} Unique id of time range.
  • from {number} Datetime timeRange starts on.
  • to {number} Datetime timeRange ends on.
  • classes {String|Array} Custom CSS classes.
  • label {String} Display label.
  • resizable {Boolean} Should the time range be resizable.

Highlighted durations

Highlight a repeating block of time spanning all rows:

  • unit {String} Time unit of duration, e.g. 'day'.
  • fractions {Array} List of fractions that should be highlighted, e.g. {unit: 'day', fractions: [0,6]} will highlight weekends.

Highlighting will only work correctly if useCanvasColumns is set to false, and if highlighted unit is the same or a constant fraction of the column unit eg. day, hour, minute.


  • selectTask(id) Selects task by id.

    • id {Number|String} Id of task
  • unselectTasks() Unselects tasks.

  • scrollToTask(id, scrollBehavior) Scrolls the view to a task.

    • id {Number|String} Id of task
    • scrollBehaviour {String} auto or smooth.
  • scrollToRow(id, scrollBehavior) Scrolls the view to a row.

    • id {Number|String} Id of row
    • scrollBehaviour {String} auto or smooth.
  • updateTask(model) Updates or inserts task.

    • model {Task} Task object
  • updateTasks(models) Updates or inserts tasks.

    • models {Array<Task>} Task objects
  • updateRow(model) Updates or inserts row.

    • model {Row} Row object
  • updateRows(models) Updates or inserts rows.

    • models {Array<Row>} Row objects
  • getTask(id) Get task by id.

    • id {Number|String} Id of task
  • getRow(id) Get row by id.

    • id {Number|String} Id of row
  • getTasks(rowId) Get tasks by row id.

    • rowId {Number|String} Id of row


Synchronously run callbacks on specific events. Subscribe to these after gantt is created. => console.log('Listener: task selected', task));


  • move (task) Runs while task is moving.
  • switchRow (task, row, previousRow) Runs when user switches row of task.
  • select (task) Runs when user selects task.
  • moveEnd (task) Runs when user stops moving task.
  • change (task) Runs after dropping a task, before it is updated.
  • changed (task) Runs after dropping a task, after it is updated.

Available modules

  • SvelteGanttTable Renders a table on the left side of gantt. Needed for row labels.
  • SvelteGanttDependencies Renders dependencies between tasks.
  • SvelteGanttExternal Enables external DOM elements to be draggable to svelte-gantt. Useful for creating new tasks:
new SvelteGanttExternal(
    // external DOM element
    // options
        // reference to instance of svelte-gantt
        // if enabled
        enabled: true,
        // success callback
        // row: row element was dropped on
        // date: date element was dropped on
        // gantt: instance of svelte-gantt
        onsuccess: (row, date, gantt) => {
            // here you can add a task to row, see './public/main.js'
        // called when dragged outside main gantt area
        onfail: () => {},
        // factory function, creates HTMLElement that will follow the mouse
        elementContent: () => {
            const element = document.createElement('div');
            element.innerHTML = 'New Task';
            Object.assign(, {
                position: 'absolute',
                background: '#eee',
                padding: '0.5em 1em',
                fontSize: '12px',
                pointerEvents: 'none'
            return element;

Usage with svelte

To use svelte components import from svelte-gantt/svelte:

    import { SvelteGantt, SvelteGanttTable, MomentSvelteGanttDateAdapter } from 'svelte-gantt/svelte';

    let options = {
<div class="container">
    <SvelteGantt {...options}></SvelteGantt>

Development build

If you want to build from sources: Install the dependencies...

cd svelte-gantt
npm install
cd demo
npm install

...then in the project root (cd ..) start Rollup:

npm run demo:dev

Navigate to localhost:5173. You should see your app running. Edit a component file in src, save it, and reload the page to see your changes.

Build the package

To build the package yourself:

  1. Clone or download repository.
  2. Run the package build:
npm install
npm run package
  1. The package is built in ./dist


  • Context-menus (click on row, task or dependency)

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