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EasyCharts: HTML Chart Elements with Web Components

Custom web components for creating SVG charts. The project includes three types of charts: line chart, multiline chart and bar chart.

Usage

To use the custom web components in HTML files, the transpiled JavaScript file named easycharts.js, located in the dist/ directory, has to be included in the HTML file. There are multiple examples in the examples/ directory of dist/.

Data Input Modes

There are basically 2 modes, which are accepted for adding chart data for both of the charts and in the following they get discussed in more detail.

HTML Table

EasyCharts offers a way to input data in HTML table format inside the bar or line chart. Basic example:

<table>
  <thead>
    <tr>
      <th>Party Results</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>SPÖ</td>
      <td>29.29</td>
    </tr>
    <tr>
      <td>ÖVP</td>
      <td>28.45</td>
    </tr>
    <!--Other HTML-->
  </tbody>
</table>

The first <td> inside <tbody> represents the label of the data point and the following <td> elements are the values of the data point.

The following attributes are present in a <th> element:

Attribute Description
id Unique id for data series represented in <th>. Used for CSS in line chart for the line color.
class Class attribute of data series in <th>. Used for CSS in line chart for the line color.

The following attributes are present in a <td> element:

Attribute Description
id Unique id for data point represented in <td>. Used for CSS in bar chart for the bar color.
class Class attribute of data point in <td>. Used for CSS in bar chart for the bar color.

Data Series

If HTML tables seem too complicated, data series can be used. Basic example:

<dataseries name="dataseries1">
  <datapoint> 1960,3.03 </datapoint>
  <datapoint> 1970,3.70 </datapoint>
  <!--Other HTML-->
</dataseries>

The label is on the left of the comma seperator (,) and on the right of the comma seperator there is the value of the data point. Furthermore, each data series has to have a name, using the name attribute.

The following attributes are present in a <dataseries> element:

Attribute Description
name Name of the data series. Necessary for the internal data structure. In multiline chart it represents the line name.
id Unique id for data series. Used for CSS in line chart for the line color.
class Class attribute of the data series. Used for CSS in line chart for the line color.

The following attributes are present in a <datapoint> element:

Attribute Description
id Unique id for data point. Used for CSS in bar chart for the bar color.
class Class attribute of the data point. Used for CSS in bar chart for the bar color.

Line Chart

To add a single series line chart to the HTML file, using data series, the following structure has to be used:

<ec-linechart chart-title="ChartTitle">
  <x-axis-title>X Axis Title</x-axis-title>
  <y-axis-title>Y Axis Title</y-axis-title>
  <dataseries name="dataseries1">
    <datapoint> Label1,1 </datapoint>
    <datapoint> Label2,2 </datapoint>
    <!--Other HTML-->
  </dataseries>
</ec-linechart>

To add a single series line chart to the HTML file, using HTML table format, the following structure has to be used:

<ec-linechart chart-title="ChartTitle">
  <x-axis-title>X Axis Title</x-axis-title>
  <y-axis-title>Y Axis Title</y-axis-title>
  <table>
    <thead>
      <tr>
        <th>dataseries1</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Label1</td>
        <td>1</td>
      </tr>
      <tr>
        <td>Label2</td>
        <td>2</td>
      </tr>
      <!--Other HTML-->
    </tbody>
  </table>
</ec-linechart>

The possible attributes of <ec-linechart> are the following:

Attribute Description
height Height of the chart.
width Width of the chart.
id Unique id for the chart. Used for setting the height and width of the chart, or specifying if the x axis ticks should be shown, through CSS.
class Class attribute of the chart. Used for setting the height and width of the chart, or specifying if the x axis ticks should be shown, through CSS.
chart-title Title of the chart.

Multiline Chart

To create a multiline chart with data series, the following structure has to be used:

<ec-linechart chart-title="ChartTitle">
  <x-axis-title>X Axis Title</x-axis-title>
  <y-axis-title>Y Axis Title</y-axis-title>
  <dataseries name="dataseries1">
    <datapoint> Label1,1 </datapoint>
    <datapoint> Label2,2 </datapoint>
    <!--Other HTML-->
  </dataseries>
  <dataseries name="dataseries2">
    <datapoint> Label1,3 </datapoint>
    <datapoint> Label2,4 </datapoint>
    <!--Other HTML-->
  </dataseries>
</ec-linechart>

To create a multiline chart with HTML table format, the following structure has to be used:

<ec-linechart chart-title="ChartTitle">
  <x-axis-title>X Axis Title</x-axis-title>
  <y-axis-title>Y Axis Title</y-axis-title>
  <table>
    <thead>
      <tr>
        <th>dataseries1</th>
        <th>dataseries2</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Label1</td>
        <td>1</td>
        <td>3</td>
      </tr>
      <tr>
        <td>Label2</td>
        <td>2</td>
        <td>4</td>
      </tr>
      <!--Other HTML-->
    </tbody>
  </table>
</ec-linechart>

The attributes of this type of chart are of course the same as in the previous section (see Line Chart), as these 2 types are using the same HTML element.

Bar Chart

To add a bar chart to the HTML file, the structure shown in the Line Chart chapter (see Line Chart) has to be used. but with the

<ec-barchart>
  <!--Other HTML-->
</ec-barchart>

HTML tags. To see full list of attributes, please again refer to the Line Chart section, because the attributes are exactly the same.

Styling With CSS

There are 2 ways to style the components in CSS:

  • Through id's (#id)
  • Through class attributes (.class)

To see which CSS property belongs to which element look for the tables in the previous chapters.

Table showing all currently available CSS properties:

Property Description
--color Set color of data series/data point.
--chart-height Set height of the chart.
--chart-width Set width of the chart.
--show-ticks Flag either true or false for specifying if x axis ticks should be shown. Default is true.

Example usage:

<!--Other HTML-->
<style>
  .mlinechart1 {
    --chart-width: 500;
    --chart-height: 300;
    --show-ticks: false;
  }
  #samsung {
    --color: blue;
  }
  #apple {
    --color: green;
  }
</style>
<!--Other HTML-->
<ec-linechart class="mlinechart1">
  <table>
    <thead>
      <tr>
        <th id="samsung">Samsung</th>
        <th id="apple">Apple</th>
      </tr>
    </thead>
    <!--Other HTML-->
  </table>
</ec-linechart>

Other HTML Elements

There are 2 additional HTML elements, which are needed for setting the x and y axis titles:

  • <x-axis-title> X Axis Title </x-axis-title>
  • <y-axis-title> Y Axis Title </y-axis-title>

These are valid when using the table mode, as well as when using the data series mode.

For Developers

Installation

To install the custom EasyCharts web components, follow these steps:

  1. Clone or download the project repository.

  2. Install and use the minimum NodeJS version v14.18.1 (npm v6.14.15).

  3. Install the required dependencies by running the following command in the project root directory:

    npm install

Building the Project

The project uses Gulp as a build tool. To build the project, run the following command in the project root directory:

npx gulp

This will execute a series of commands:

  1. Copies the src/examples folder into dist/ to provide some examples to the user.
  2. Transpiles the source file easycharts.mts and it generates the JavaScript file easycharts.js into the dist/ directory. The transpiliation works using Rollup, whereas it bundles the easycharts.mts with components of the D3 library.
  3. Executes the npm run serve command creating a local server serving local project files, enabling the user to avoid the Cross Origin Policy. So the user can e.g. input an external CSS file.

Project File-Structure

EasyCharts
├─ .gitignore
├─ LICENSE
├─ README.md
├─ dist
│  ├─ easycharts.js
│  └─ examples
│     ├─ barchart
│     │  ├─ barchart-table.html
│     │  ├─ easycharts.js
│     │  └─ style.css
│     ├─ linechart
│     │  ├─ easycharts.js
│     │  ├─ linechart-dataseries.html
│     │  ├─ linechart-table.html
│     │  └─ style.css
│     └─ multilinechart
│        ├─ easycharts.js
│        ├─ multilinechart-dataseries.html
│        ├─ multilinechart-table.html
│        └─ style.css
├─ gulpfile.mjs
├─ package-lock.json
├─ package.json
├─ rollup.config.mjs
├─ src
│  ├─ easycharts.mts
│  └─ examples
│     ├─ barchart
│     │  ├─ barchart-table.html
│     │  ├─ easycharts.js
│     │  └─ style.css
│     ├─ linechart
│     │  ├─ easycharts.js
│     │  ├─ linechart-dataseries.html
│     │  ├─ linechart-table.html
│     │  └─ style.css
│     └─ multilinechart
│        ├─ easycharts.js
│        ├─ multilinechart-dataseries.html
│        ├─ multilinechart-table.html
│        └─ style.css
└─ tsconfig.json

License

This project is licensed under the MIT License.

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