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common-charts-js

v1.0.1

Published

The most common charts in data visualization graphs such as line, bar, pie and more are pre built using D3.js for re usability.

Downloads

3

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Links

Git

Maintainers

metalbolicxmetalbolicx

Keywords

d3.jsdata visualizationsvggraphschartshtmlcssjavascript

Readme

common-charts-js

By José Martínez Santana

Technologies used

Description

D3, the short name for Data-Driven Documents, is a JavaScript library for manipulating documents based on data. D3 helps to bind data to HTML, SVG and CSS. It provides a wide range of tools and functions that enable developers to create interactive and dynamic data visualizations.

common-charts-js solves the problem re write again and again the same code for the common data visualization charts (like line 📈, bar 📊, etc.). This is a library which has prebuild charts using the Object Oriented Programming classes of ECMAScript 6. The user only needs to import the class chart and provide the parameters to create it. In addition if the user knows D3, it is possible to customize more any of the pre build chart.

Charts at disposal

The library has the next charts in the current version:

  1. Line (single and multi series).
  2. Bar (simple, grouped, stacked and normalized).
  3. Area (single and multi series).
  4. Slope.
  5. Radar.

Installation

  1. Install NodeJS on your computer.
  2. Create a folder for your project.
  3. Execute the next command in the terminal:
npm i -S common-charts-js

Usage

How to download D3 library

This library do not use the npm install d3 to avoid the unnecessary loading js files of the whole D3 library.

In order to download D3 the lastest version and use it in a vanilla HTML in modern browsers, import D3 from jsDelivr or unpkg or another CDN.

Example of the import in the HTML script tag

<script src="https://d3js.org/d3.v7.js" type="text/javascript" charset="utf-8"></script>

How initialize a chart

  1. Create a HTML file. Add the D3 library, add svg element where the chart will be contained. Finally at a script tag of your code.
<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/dist/d3.min.js" type="text/javascript"></script>
    <title>Common charts example</title>
  </head>
  <body>
    <h1>Example of how to use the common-charts-js library</h1>
    <svg class="chart"></svg>
    <script type="module" src="./firstgraph.js"></script>
  </body>
</html>
  1. Create a file called firstgraph.js. Inside it, import the desired chart to be displayed. The common-charts-js library. They were written using the ECMACScript 6 modules. For example the multi line series graph.
import { MultiLineGraph }  from "common-charts-js";
  1. Create or fetch a data source. Data always needs to be an array of JSON format structure with the independent variable and depend variable(s). The library will take care of creating a detailed data structure for binding the data to the svg elements. For example, graph the next mathematical function: $$y = f(x) = x^2$$
const data /**@type {Array<{ x: number, y: number }>}*/ = [
    {x: 1, y: 1},
    {x: 2, y: 4},
    {x: 3, y: 9},
    {x: 4, y: 16},
    {x: 5, y: 25},
    {x: 6, y: 36},
    {x: 7, y: 49},
    {x: 8, y: 64},
    {x: 9, y: 81},
    {x: 10, y: 100}
];
  1. Initalize the imported class of the MultiLineGraph. For more details, see the documentation.
const graph = new MultiLineGraph({
  rawData: data,
  svgSelector: "svg.chart",
  independentSerie: "x",
  dependentSeries: ["y"],
  independentScale: d3.scaleLinear(),
  dependentScale: d3.scaleLinear(),
  colorScale: d3.scaleOrdinal().range(schemeSet2),
  independentAxis: d3.axisBottom(),
  dependentAxis: d3.axisLeft(),
});
  1. Start to draw the chart in the svg container of the HTML document.
graph.renderSeries();
graph.renderIndependentAxis();
graph.renderDependentAxis();

Limitations

Neither the common-chart-js and D3 are libraries for complex data cleaning. The recommended use of them are with cleaned semi structured data previously processed with another tool such as Ms Excel or Pandas for Python or any other software for data manipulation.

The user must have some previous knowledge about how to use D3 in order to select the correct scales and axis to build the chart.

The common-chart-js code works only in D3 version 4 or above.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change. I invite you to collaborate directly in this repository: common-charts-js

License

common-charts-js is released under the MIT License.