svelte-gantt

svelte-gantt

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

Dependent on Moment.js.

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

DEMO: Large dataset, Tree, Dependencies

Installation

npm install svelte-gantt

Use ES6 imports in your code:

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

or use the IIFE build:

<link  rel='stylesheet'  href='node_modules/svelte-gantt/css/svelteGantt.css'>

<script  src='moment.js'></script>
<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

Documentation

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

gantt.$set({ 
    from: moment().startOf('week'),
    to: moment().endOf('week')
});

• 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.
• 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.
• 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>`
• tableWidth {Number} Width of table, used with SvelteGanttTable module.
• tableHeaders {Array} Headers of table, used with SvelteGanttTable module.

Header

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.

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.

Row

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.
• 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.

Task

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 {Moment} Datetime task starts on.
• to {Moment} 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.

Dependencies

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 {Moment} Datetime timeRange starts on.
• to {Moment} Datetime timeRange ends on.
• classes {String|Array} Custom CSS classes.
• label {String} Display label.

Methods

• selectTask(id) Selects task by id.
  • id {Number|String} Id of task
• 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.

Events

Synchronously run callbacks on specific events. Subscribe to these after gantt is created.

gantt.api.tasks.on.select((task) => console.log('Listener: task selected', task));

gantt.api.tasks

• 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
    document.getElementById('newTaskButton'), 
    // options
    {
        // reference to instance of svelte-gantt 
        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(element.style, {
                position: 'absolute',
                background: '#eee',
                padding: '0.5em 1em',
                fontSize: '12px',
                pointerEvents: 'none',
            });
            return element;
        }
    }
);

Development build

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

cd svelte-gantt
npm install

...then start Rollup:

npm run dev:docs

Navigate to localhost:5000. 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 build:

node tools/build

1. The package is built in ./dist

Issues

• Transitions on task drop sometimes do not play - issue introduced in Svelte 3

TBD

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