Simple widget to render bar charts on Dashing
CoffeeScript CSS Ruby HTML

README.md

dashing-barchart

Preview

BarChart

Description

Simple Dashing widget (and associated job) to render bar charts. Uses Chart.js library.

Dependencies

Download the latest v2.x.x release of Chart.bundle.min.js from https://github.com/chartjs/Chart.js/releases and copy it into assets/javascripts. Make sure to remove any older versions of Chart.js from the assets/javascripts folder.

NOTE: dashing-barchart is compatible with v2 of Chart.js. If you still want to use the older version of Chart.js, you need to download the latest v1 of Chart.min.js and install v1.0 of this widget. Although, remember that older versions are not maintained anymore.

Usage

Create the directory widgets/bar_chart and copy this widget's files into that folder.

Add the following code on the desired dashboard:

<li data-row="2" data-col="1" data-sizex="2" data-sizey="1">
  <div data-id="barchart" data-view ="BarChart" data-title="Bar Chart" data-moreinfo=""></div>
</li>

Create your bar chart job my_barchart_job.rb:

# Note: change this to obtain your chart data from some external source
labels = ['January', 'February', 'March', 'April', 'May', 'June', 'July']
data = [
  {
    label: 'First dataset',
    data: Array.new(labels.length) { rand(40..80) },
    backgroundColor: [ 'rgba(255, 99, 132, 0.2)' ] * labels.length,
    borderColor: [ 'rgba(255, 99, 132, 1)' ] * labels.length,
    borderWidth: 1,
  }, {
    label: 'Second dataset',
    data: Array.new(labels.length) { rand(40..80) },
    backgroundColor: [ 'rgba(255, 206, 86, 0.2)' ] * labels.length,
    borderColor: [ 'rgba(255, 206, 86, 1)' ] * labels.length,
    borderWidth: 1,
  }
]
options = { }

send_event('barchart', { labels: labels, datasets: data, options: options })

Title Position

By default the title will be displayed in the center of the widget. If you prefer to move it to the top, change the $title-position variable on the SCSS file. Example:

$title-position:    top;

Margins

You can also adjust the chart's margins: top, left, right and bottom. By default they are all 0 (pixels) to use the whole available space. But if needed you can change their value using the data- attributes. Example:

<li data-row="2" data-col="1" data-sizex="2" data-sizey="1">
  <div data-id="barchart" data-view ="BarChart" data-left-margin="5" data-top-margin="10"></div>
</li>

If not set, both right and bottom margins will be equal to left and top margins respectively. This is likely what you want to keep the chart centered within the widget. If not, set their values also using the data- attributes:

<li data-row="2" data-col="1" data-sizex="2" data-sizey="1">
  <div data-id="barchart" data-view ="BarChart" data-right-margin="10" data-bottom-margin="5"></div>
</li>

Contributors

License

This widget is released under the MIT License.

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