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    Create beautiful Javascript charts with one line of Ruby
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    Chartkick

    Create beautiful JavaScript charts with one line of Ruby. No more fighting with charting libraries!

    See it in action

    :fire: For admin charts and dashboards, check out Blazer

    :two_hearts: A perfect companion to Groupdate, Hightop, and ActiveMedian

    Quick Start

    Add this line to your application's Gemfile:

    gem "chartkick"
    

    In application.js, add:

    //= require Chart.bundle
    //= require chartkick
    

    This sets up Chartkick with Chart.js. For other charting libraries, see detailed instructions.

    Charts

    Line chart

    <%= line_chart User.group_by_day(:created_at).count %>
    

    Pie chart

    <%= pie_chart Goal.group(:name).count %>
    

    Column chart

    <%= column_chart Task.group_by_hour_of_day(:created_at, format: "%l %P").count %>
    

    Bar chart

    <%= bar_chart Shirt.group(:size).sum(:price) %>
    

    Area chart

    <%= area_chart Visit.group_by_minute(:created_at).maximum(:load_time) %>
    

    Scatter chart

    <%= scatter_chart City.pluck(:size, :population) %>
    

    Geo chart - Google Charts

    <%= geo_chart Medal.group(:country).count %>
    

    Timeline - Google Charts

    <%= timeline [
      ["Washington", "1789-04-29", "1797-03-03"],
      ["Adams", "1797-03-03", "1801-03-03"],
      ["Jefferson", "1801-03-03", "1809-03-03"]
    ] %>
    

    Multiple series

    <%= line_chart @goals.map { |goal|
        {name: goal.name, data: goal.feats.group_by_week(:created_at).count}
    } %>
    

    or

    <%= line_chart Feat.group(:goal_id).group_by_week(:created_at).count %>
    

    Say Goodbye To Timeouts

    Make your pages load super fast and stop worrying about timeouts. Give each chart its own endpoint.

    <%= line_chart completed_tasks_charts_path %>
    

    And in your controller, pass the data as JSON.

    class ChartsController < ApplicationController
      def completed_tasks
        render json: Task.group_by_day(:completed_at).count
      end
    end
    

    For multiple series, add chart_json at the end.

    render json: Task.group(:goal_id).group_by_day(:completed_at).count.chart_json
    

    Options

    Id, width, and height

    <%= line_chart data, id: "users-chart", width: "800px", height: "500px" %>
    

    Min and max values

    <%= line_chart data, min: 1000, max: 5000 %>
    

    min defaults to 0 for charts with non-negative values. Use nil to let the charting library decide.

    Colors

    <%= line_chart data, colors: ["#b00", "#666"] %>
    

    Stacked columns or bars

    <%= column_chart data, stacked: true %>
    

    Discrete axis

    <%= line_chart data, discrete: true %>
    

    Label (for single series)

    <%= line_chart data, label: "Value" %>
    

    Axis titles

    <%= line_chart data, xtitle: "Time", ytitle: "Population" %>
    

    Straight lines between points instead of a curve

    <%= line_chart data, curve: false %>
    

    Hide points

    <%= line_chart data, points: false %>
    

    Show or hide legend

    <%= line_chart data, legend: false %>
    

    Specify legend position

    <%= line_chart data, legend: "bottom" %>
    

    Defer chart creation until after the page loads

    <%= line_chart data, defer: true %>
    

    Donut chart

    <%= pie_chart data, donut: true %>
    

    Prefix, useful for currency - Chart.js, Highcharts

    <%= line_chart data, prefix: "$" %>
    

    Suffix, useful for percentages - Chart.js, Highcharts

    <%= line_chart data, suffix: "%" %>
    

    Set a thousands separator - Chart.js, Highcharts

    <%= line_chart data, thousands: "," %>
    

    Set a decimal separator - Chart.js, Highcharts

    <%= line_chart data, decimal: "," %>
    

    Show a message when data is empty

    <%= line_chart data, messages: {empty: "No data"} %>
    

    Refresh data from a remote source every n seconds

    <%= line_chart url, refresh: 60 %>
    

    You can pass options directly to the charting library with:

    <%= line_chart data, library: {backgroundColor: "#eee"} %>
    

    See the documentation for Chart.js, Google Charts, and Highcharts for more info.

    To customize datasets in Chart.js, use:

    <%= line_chart data, dataset: {borderWidth: 10} %>
    

    You can pass this option to individual series as well.

    Global Options

    To set options for all of your charts, create an initializer config/initializers/chartkick.rb with:

    Chartkick.options = {
      height: "400px",
      colors: ["#b00", "#666"]
    }
    

    Customize the html

    Chartkick.options[:html] = '<div id="%{id}" style="height: %{height};">Loading...</div>'
    

    You capture the JavaScript in a content block with:

    Chartkick.options[:content_for] = :charts_js
    

    Then, in your layout, use:

    <%= yield :charts_js %>
    

    For Padrino, use yield_content instead of yield

    This is great for including all of your JavaScript at the bottom of the page.

    Data

    Pass data as a hash or array

    <%= pie_chart({"Football" => 10, "Basketball" => 5}) %>
    <%= pie_chart [["Football", 10], ["Basketball", 5]] %>
    

    For multiple series, use the format

    <%= line_chart [
      {name: "Series A", data: series_a},
      {name: "Series B", data: series_b}
    ] %>
    

    Times can be a time or a string (strings are parsed)

    <%= line_chart({20.day.ago => 5, "2013-05-07 00:00:00 UTC" => 7}) %>
    

    Multiple Series

    You can pass a few options with a series:

    • name
    • data
    • color
    • dataset - Chart.js only
    • points - Chart.js only
    • curve - Chart.js only

    Code

    If you want to use the charting library directly, get the code with:

    <%= line_chart data, code: true %>
    

    The code will be logged to the JavaScript console.

    JavaScript functions cannot be logged, so it may not be identical.

    Download Charts

    Chart.js only

    Give users the ability to download charts. It all happens in the browser - no server-side code needed.

    <%= line_chart data, download: true %>
    

    Safari will open the image in a new window instead of downloading.

    Set the filename

    <%= line_chart data, download: {filename: "boom"} %>
    

    Set the background color

    <%= line_chart data, download: {background: "#ffffff"} %>
    

    Set title

    <%= line_chart data, title: "Awesome chart" %>
    

    Installation

    Add this line to your application's Gemfile:

    gem "chartkick"
    

    Next, choose your charting library.

    Charting Libraries

    In the instructions below, application.js must be included before the charts in your views, unless using the :content_for option.

    Chart.js

    In application.js, add:

    //= require Chart.bundle
    //= require chartkick
    

    Google Charts

    In application.js, add:

    //= require chartkick
    

    In your views, before application.js, add:

    <%= javascript_include_tag "https://www.gstatic.com/charts/loader.js" %>
    

    Highcharts

    Download highcharts.js into vendor/assets/javascripts (or use yarn add highcharts in Rails 5.1+).

    In application.js, add:

    //= require highcharts
    //= require chartkick
    

    Works with Highcharts 2.1+

    Webpacker

    For Webpacker, use Yarn to install the JavaScript libraries:

    yarn add chartkick chart.js # or highcharts
    

    Then include them in your pack.

    import Chartkick from "chartkick";
    window.Chartkick = Chartkick;
    
    // for Chart.js
    import Chart from "chart.js";
    Chartkick.addAdapter(Chart);
    
    // for Highcharts
    import Highcharts from "highcharts";
    Chartkick.addAdapter(Highcharts);
    
    // for Google Charts
    // just include https://www.gstatic.com/charts/loader.js in your views
    

    You pack must be included before the charts in your views, unless using the :content_for option.

    Sinatra and Padrino

    Download chartkick.js and include it manually.

    <script src="chartkick.js"></script>
    

    Localization

    To specify a language for Google Charts, add:

    Chartkick.configure({language: "de"});
    

    after the JavaScript files and before your charts.

    Multiple Libraries

    If more than one charting library is loaded, choose between them with:

    <%= line_chart data, adapter: "google" %> <!-- or highcharts or chartjs -->
    

    JavaScript API

    Access a chart with:

    var chart = Chartkick.charts["chart-id"]
    

    Get the underlying chart object with:

    chart.getChartObject()
    

    You can also use:

    chart.getElement()
    chart.getData()
    chart.getOptions()
    chart.getAdapter()
    

    Update the data with:

    chart.updateData(newData)
    

    You can also specify new options:

    chart.setOptions(newOptions)
    // or
    chart.updateData(newData, newOptions)
    

    Refresh the data from a remote source:

    chart.refreshData()
    

    Redraw the chart with:

    chart.redraw()
    

    Loop over charts with:

    Chartkick.eachChart( function(chart) {
      // do something
    })
    

    Content Security Policy (CSP)

    Check out how to configure CSP

    No Ruby? No Problem

    Check out chartkick.js

    Tutorials

    Upgrading

    3.0

    Breaking changes

    • Removed support for Rails < 4.2
    • Removed chartkick.js from asset precompile (no longer needed)
    • Removed xtype option - numeric axes are automatically detected
    • Removed window.Chartkick = {...} way to set config - use Chartkick.configure instead
    • Removed support for the Google Charts jsapi loader - use loader.js instead

    2.0

    Breaking changes

    • Chart.js is now the default adapter if multiple are loaded - yay open source!
    • Axis types are automatically detected - no need for discrete: true
    • Better date support - dates are no longer treated as UTC

    Credits

    Chartkick uses iso8601.js to parse dates and times.

    History

    View the changelog

    Chartkick follows Semantic Versioning

    Contributing

    Everyone is encouraged to help improve this project. Here are a few ways you can help:

    Show All