Nightly Panic Munchies


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    d3-funnel is an extensible, open-source JavaScript library for rendering funnel charts using the D3.js library.

    d3-funnel is focused on providing practical and visually appealing funnels through a variety of customization options. Check out the examples page to get a showcasing of the several possible options.


    To install this library, simply include both D3.js and D3Funnel:

    <script src="/path/to/d3.js"></script>
    <script src="/path/to/dist/d3-funnel.js"></script>

    Alternatively, if you are using Webpack or Browserify, you can install the npm package and import the module. This will include a compatible version of D3.js for you:

    npm install d3-funnel --save
    import D3Funnel from 'd3-funnel';


    To use this library, you must create a container element and instantiate a new funnel chart. By default, the chart will assume the width and height of the parent container:

    <div id="funnel"></div>
        const data = [
            { label: 'Inquiries', value: 5000 },
            { label: 'Applicants', value: 2500 },
            { label: 'Admits', value: 500 },
            { label: 'Deposits', value: 200 },
        const options = {
            block: {
                dynamicHeight: true,
                minHeight: 15,
        const chart = new D3Funnel('#funnel');
        chart.draw(data, options);


    Option Description Type Default
    chart.width The width of the chart in pixels or a percentage. mixed Container's width
    chart.height The height of the chart in pixels or a percentage. mixed Container's height
    chart.bottomWidth The percent of total width the bottom should be. number 1 / 3
    chart.bottomPinch How many blocks to pinch on the bottom to create a funnel "neck". number 0
    chart.inverted Whether the funnel direction is inverted (like a pyramid). bool false
    chart.animate The load animation speed in milliseconds. number 0 (disabled)
    chart.curve.enabled Whether the funnel is curved. bool false
    chart.curve.height The curvature amount. number 20
    chart.totalCount Override the total count used in ratio calculations. number null
    block.dynamicHeight Whether the block heights are proportional to their weight. bool false
    block.dynamicSlope Whether the block widths are proportional to their value decrease. bool false
    block.barOverlay Whether the blocks have bar chart overlays proportional to its weight. bool false
    block.fill.scale The background color scale as an array or function. mixed d3.schemeCategory10
    block.fill.type Either 'solid' or 'gradient'. string 'solid'
    block.minHeight The minimum pixel height of a block. number 0
    block.highlight Whether the blocks are highlighted on hover. bool false
    label.enabled Whether the block labels should be displayed. bool true
    label.fontFamily Any valid font family for the labels. string null
    label.fontSize Any valid font size for the labels. string '14px'
    label.fill Any valid hex color for the label color. string '#fff'
    label.format Either function(label, value) or a format string. See below. mixed '{l}: {f}'
    tooltip.enabled Whether tooltips should be enabled on hover. bool false
    tooltip.format Either function(label, value) or a format string. See below. mixed '{l}: {f}' Callback function(data) for when a block is clicked. function null

    Label/Tooltip Format

    The option label.format can either be a function or a string. The following keys will be substituted by the string formatter:

    Key Description
    '{l}' The block's supplied label.
    '{v}' The block's raw value.
    '{f}' The block's formatted value.

    Event Data

    Block-based events are passed a data object containing the following elements:

    Key Type Description
    index number The index of the block.
    node object The DOM node of the block.
    value number The numerical value.
    fill string The background color.
    label.raw string The unformatted label.
    label.formatted string The result of options.label.format.
    label.color string The label color.


        index: 0,
        node: { ... },
        value: 150,
        fill: '#c33',
        label: {
            raw: 'Visitors',
            formatted: 'Visitors: 150',
            color: '#fff',

    Overriding Defaults

    You may wish to override the default chart options. For example, you may wish for every funnel to have proportional heights. To do this, simply modify the D3Funnel.defaults property:

    D3Funnel.defaults.block.dynamicHeight = true;

    Should you wish to override multiple properties at a time, you may consider using lodash's _.merge or jQuery's $.extend:

    D3Funnel.defaults = _.merge(D3Funnel.defaults, {
        block: {
            dynamicHeight: true,
            fill: {
                type: 'gradient',
        label: {
            format: '{l}: ${f}',

    Advanced Data

    In the examples above, both label and value were just to describe a block within the funnel. A complete listing of the available options is included below:

    Option Type Description Example
    label mixed Required. The label to associate with the block. 'Students'
    value number Required. The value (or count) to associate with the block. 500
    backgroundColor string A row-level override for block.fill.scale. Hex only. '#008080'
    formattedValue mixed A row-level override for label.format. 'USD: $150'
    hideLabel bool Whether to hide the formatted label for this block. true
    labelColor string A row-level override for label.fill. Hex only. '#333'


    Additional methods beyond draw() are accessible after instantiating the chart:

    Method Description
    destroy() Removes the funnel and its events from the DOM.


    MIT license.


    npm i d3-funnel

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    • jzatecky