Easily add Charts into Dashing with Chartjs (Line, Bar, Radar, Polar Area, Pie, Doughnut)

README.md

smashing-chartjs

An easy interface to use all of chartjs.org's charts.

Inspired by my own pain and suffering of trying to add a simple chart to smashing

Make awesome charts like these:

## Installation ##### 1. Import Chartjs library In `dashboards/layout.erb`, add this script tag:

<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>

before this script tag:

<script type="text/javascript" src="/assets/application.js"></script>

2. Install smashing-chartjs

Run in terminal in project directory

smashing install b4a67180da816eb0695f

Example

Let's create a simple line chart!

Usage

Line Chart

<div
  data-id="line-chart"
  data-view="Chartjs"
  data-type="line"
  data-labels="Week 1,Week 2,Week 3,Week 4,Week 5"
  data-colornames="blue,blue,blue,blue,blue"
  data-datasets="10,39,20,49,87"
  data-height="400"
  data-width="400"
></div>

Bar Charts

<div
  data-id="bar-chart"
  data-view="Chartjs"
  data-type="bar"
  data-labels="Day 1,Day 2,Day 3,Day 4,Day 5"
  data-colornames="yellow,yellow,yellow,yellow,yellow"
  data-datasets="210,339,220,494,109"
  data-height="400"
  data-width="400"
></div>

Radar Charts

<div
  data-id="radar-chart"
  data-view="Chartjs"
  data-type="radar"
  data-labels="Crossfit,Yoga,Weight Lifting,Running,Swimming,Watching TV"
  data-colornames="yellow,yellow,yellow,yellow,yellow,yellow"
  data-datasets="210,339,220,234,311,494"
  data-height="400"
  data-width="400"
></div>

Polar Area Charts

<div
  data-id="chart-polarArea"
  data-view="Chartjs"
  data-type="polarArea"
  data-labels="Week 1,Week 2,Week 3,Week 4,Week 5"
  data-colornames="blue,yellow,green,cyan,gray"
  data-datasets="10,39,20,49,87"
  data-height="400"
  data-width="400"
></div>

Pie Charts

@pieChart(elementId, dataSets)

<div
  data-id="chart-pie"
  data-view="Chartjs"
  data-type="pie"
  data-labels="Pumpkin,Apple,Pizza,Rhubarb"
  data-colornames="red,green,yellow,gray"
  data-datasets="13,32,40,20"
  data-height="400"
  data-width="400"
></div>

Doughnut Charts

@doughnutChart(elementId, dataSets)

<div
  data-id="doughnut-pie"
  data-view="Chartjs"
  data-type="doughnut"
  data-labels="Apple Fritter,Chocolate,Maple"
  data-colornames="green,blue,darkgray"
  data-datasets="20,13,12"
  data-height="400"
  data-width="400"
></div>

Colors

Currently available colors

blue | cyan | darkgray | gray | green | lightgray | magenta | red | yellow

chartjs.coffee

class Dashing.Chartjs extends Dashing.Widget

  constructor: ->
    super
    @id = @get("id")
    @type = @get("type")
    @labels = @get("labels") && @get("labels").split(",")
    @datasets = @get("datasets") && @get("datasets").split(",")
    @colorNames = @get("colornames") && @get("colornames").split(",")

  ready: ->
    switch @type
      when 'pie', 'doughnut', 'polarArea'
        @circularChart @id, type: @type, labels: @labels, colors: @colorNames, datasets: @datasets
      when 'line', 'bar', 'radar'
        @linearChart @id, type: @type, labels: @labels, colors: @colorNames, datasets: @datasets
      else
        return

  circularChart: (id, { type, labels, colors, datasets, options={} }) ->
    data = @merge labels: labels, datasets: [@merge data: datasets, @colors(colors)]
    new Chart(document.getElementById(id), { type: type, data: data }, options)

  linearChart: (id, { type, labels, colors, datasets, options={} }) ->
    data = @merge labels: labels, datasets: [@merge(@colors(colors), data: datasets)]
    new Chart(document.getElementById(id), { type: type, data: data }, options)

  merge: (xs...) =>
    if xs?.length > 0
      @tap {}, (m) -> m[k] = v for k, v of x for x in xs

  tap: (o, fn) -> fn(o); o

  colorCode: ->
    blue: "151, 187, 205"
    cyan:  "0, 255, 255"
    darkgray: "77, 83, 96"
    gray: "148, 159, 177"
    green: "70, 191, 189"
    lightgray: "220, 220, 220"
    magenta: "255, 0, 255"
    red: "247, 70, 74"
    yellow: "253, 180, 92"

  colors: (colorNames) ->
    backgroundColor: colorNames.map (colorName) => @backgroundColor(colorName)
    borderColor: colorNames.map (colorName) => @borderColor(colorName)
    borderWidth: colorNames.map (colorName) -> 1
    pointBackgroundColor: colorNames.map (colorName) => @pointBackgroundColor(colorName)
    pointBorderColor: colorNames.map (colorName) => @pointBorderColor(colorName)
    pointHoverBackgroundColor: colorNames.map (colorName) => @pointHoverBackgroundColor(colorName)
    pointHoverBorderColor: colorNames.map (colorName) => @pointHoverBorderColor(colorName)

  color: (colorName) ->
    backgroundColor: @backgroundColor(colorName)
    borderColor: @borderColor(colorName)
    borderWidth: 1
    pointBackgroundColor: @pointBackgroundColor(colorName)
    pointBorderColor: @pointBorderColor(colorName)
    pointHoverBackgroundColor: @pointHoverBackgroundColor()
    pointHoverBorderColor: @pointBackgroundColor(colorName)

  backgroundColor: (colorName) -> "rgba(#{ @colorCode()[colorName] }, 0.2)"
  borderColor: (colorName) -> "rgba(#{ @colorCode()[colorName] }, 1)"
  pointBackgroundColor: (colorName) -> "rgba(#{ @colorCode()[colorName] }, 1)"
  pointBorderColor: (colorName) -> "rgba(#{ @colorCode()[colorName] }, 1)"
  pointHoverBackgroundColor: -> "fff"
  pointHoverBorderColor: (colorName) -> "rgba(#{ @colorCode()[colorName] }, 0.8)"

  circleColor: (colorName) ->
    backgroundColor: "rgba(#{ @colorCode()[colorName] }, 0.2)"
    borderColor: "rgba(#{ @colorCode()[colorName] }, 1)"
    borderWidth: 1
    hoverBackgroundColor: "#fff"
    hoverBorderColor: "rgba(#{ @colorCode()['blue'] },0.8)"

chartjs.html

<canvas data-bind-id="id" data-bind-data-height="height | default 200" data-bind-data-width="width | default 200"></canvas>

jobs_example.rb

SCHEDULER.every "2s" do |job|
  send_event("chart", {
  	type: "bar",
  	header: "Calories Burned",
  	labels: ["Day 1", "Day 2", "Day 3", "Day 4", "Day 5"],
  	colorNames: ["yellow", "yellow", "yellow", "yellow", "yellow"],
  	datasets: [210, 339, 220, 494, 109]
  })
end

First of all: thanks for the widget, it's great!

Is there any way to change the labels size and color or let the axes start by zero?
I tried this in the job file, but it didn't work:
send_event("myChart", { type: "bar", header: "Bar chart demo", labels: ["first bar'", "second bar'"], colorNames: ["green", "blue"], datasets: [display_firstValue, display_secondValue], options: { legend: { labels: { fontColor: "white", fontSize: 30 } }, scales: { yAxes: [{ ticks: { fontColor: "white", fontSize: 30, stepSize: 300, beginAtZero: true } }], xAxes: [{ ticks: { fontColor: "white", fontSize: 26, stepSize: 300, beginAtZero: true } }] } } })

Hi! Thanks a lot for the amazing work ! It's really great and easy to use.

Although I'm facing an issue with passing options to the charts, and nothing that I've tried seems to have any effect on the chart. I tried passing the options in the job file as in the comment above, putting the options in multiple places in the chartjs.coffee file, but none seems to work. Do you have an example of working chart with custom options? It would be amazing.

Thanks in advance!

Hello @cevapIT and @brieuclambert.

I unfortunately haven't had as much time as I would like to put in this project.
I'm happily accepting any PRs! This project definitely could use the love.

Thanks for using it though!

Thanks @tywhang for this, it's great.
Any chance you can help me pass options to the charts please? I'm looking to disable the legend on a doughnut chart with something like this:

options: { legend: { display: false }

I'm sure there is a simple way to do this as I see you have accounted for the options in the coffee script. I just can't seem to pass the options so they work. Thanks in advance.

@grubbychicken Getting those options passed correctly is definitely on my TO-DO list. I haven't worked on this project in a while. It could take some time for me to get to it.

You are welcome to make a Pull Request! :D

@grubbychicken Getting those options passed correctly is definitely on my TO-DO list. I haven't worked on this project in a while. It could take some time for me to get to it.

You are welcome to make a Pull Request! :D

Hi @tywhang
Thanks for the solution.
Could you please explain what options now available to pass and how to do this. I tried everything from above. It didn't work

Hi,
I am having trouble setting up a pie chart with an additional layer. Havent been able to correclty pass a second dataset. Does anyone have a quick example/tip of how to do it? Thx!

@tywhang I am seeing this error when I run smashing install b4a67180da816eb0695f

.rbenv/versions/3.0.1/lib/ruby/gems/3.0.0/gems/smashing-1.3.4/lib/dashing/downloader.rb:14:in `initialize': No such file or directory @ rb_sysopen - https://api.github.com/gists/b4a67180da816eb0695f (Errno::ENOENT)