node-red-contrib-chartjs

A Node-RED node to provide charts for plotting things on. Implemented by Chart.js

Description

This nodes package permit to use Chart.js charts from Node-RED. The objective is create a new url path for each chart created, this url path could be configured and updated at runtime.

For the latest updates see the CHANGELOG.md

Installation

npm install node-red-contrib-chartjs --save

Charts implemented

• Line Chart

• Multi Line Chart

• Vertical Bar Chart

• Horizontal Bar Chart

• Pie Chart

• Doughnut Chart

• Polar Area Chart

• Bubble Chart

• Radar Chart

Chart configuration

The Chart attributes are:

• Path: The Chart Url to be access. An example where path is TP01 could be:

http://localhost:1880/TP01

• Tittle: The chart title
• X Axis: The X axis label
• Y Axis: The Y axis label
• Payload: The chart dataset object

The chart payload attributes are:

• channel: The channel legend
• color: The chart color line
• dataset: The chart dataset

The payload dataset attributes are:

• x: x axis dataset value
• y: y axis dataset value

Read node help to check the dataset structure for each chart. The Line Charts dataset could be multi serial graphs like this:

[{"channel": "Population",
  "color": "Blue",
  "dataset": [{
      "x": "Europe",
      "y": 741
  },
  {
      "x": "Australia",
      "y": 24
  },
  {
      "x": "Africa",
      "y": 1.2
  },
  {
      "x": "America",
      "y": 325
  },
  {
      "x": "Asia",
      "y": 4.4
  }]},
  {"channel": "Economy",
    "color": "Green",
    "dataset": [{
        "x": "Europe",
        "y": 12
    },
    {
        "x": "Australia",
        "y": 13
    },
    {
        "x": "Africa",
        "y": 3
    },
    {
        "x": "America",
        "y": 22
    },
    {
        "x": "Asia",
        "y": 18
    }]}
]                

NOTE: The new multiserial linear chart implementation is compatible with the previous one versions

The rest of the charts dataset are not multiserial graphs. An example could be like this:

{
    "channel": "Population",
    "color": "Green",
    "dataset": [
        {
            "x": "Europe",
            "y": 741
        },
        {
            "x": "Australia",
            "y": 24
        },
        {
            "x": "Africa",
            "y": 1.2
        },
        {
            "x": "America",
            "y": 325
        },
        {
            "x": "Asia",
            "y": 4.4
        }
    ]
}               

Dependencies

Server side

• socker.io: socket.io server side
• serve-static: Serve static files
• cors: Node.js CORS middleware

Client side

• socker.io-client: Socket.io client side
• jquery: Multipurpose javascript library
• bootstrap4: Build responsive, mobile-first projects on the web
• popper.js: A kickass library used to manage poppers in the web applications
• Chart.js: Simple yet flexible JavaScript charting for designers & developers
• jsPDF: The leading HTML5 client solution for generating PDFs

Example

Under example folder you have a json flow to be imported in your node-red instance to test the nodes.