node-chartist

SVG Charts on the server.

Node Chartist is a functional server-side wrapper for the popular Chartist library. It generates static svg charts and adds support for a few useful features such as axis titles and chart legends.

npm install node-chartist

The accompanying CSS can be found at dist/main.css after installation.

const co = require('co');
const generate = require('node-chartist');

co(function * () {

  // options object
  const options = {width: 400, height: 200};
  const data = {
    labels: ['a','b','c','d','e'],
    series: [
      [1, 2, 3, 4, 5],
      [3, 4, 5, 6, 7]
    ]
  };
  const bar = yield generate('bar', options, data); //=> chart HTML


  // options function
  const options = (Chartist) => ({width: 400, height: 200, axisY: { type: Chartist.FixedScaleAxis } });
  const data = {
    labels: ['a','b','c','d','e'],
    series: [
      [1, 2, 3, 4, 5],
      [3, 4, 5, 6, 7]
    ]
  };
  const bar = yield generate('bar', options, data); //=> chart HTML

});

generate ( type , options , data )

A curried function that generates a static svg chart.
Returns a Promise that is fulfilled with the static chart HTML.
Arguments

• type - A string used to determine what type of chart to generate. Supported values are:

- bar - line - pie

• options - An object or a function that returns an object of chart options. If a function is used, it will be called with the Chartist object.

Options are dependent on the chart `type`. All options in the [Chartist Api Documentation](http://gionkunz.github.io/chartist-js/api-documentation.html) are supported. In addition to those, the following options are supported by node-chartist:

- axisX.title - A string to use as the x axis title.
- axisY.title - A string to use as the y axis title.
- legend - A boolean used to determine whether a legend should be generated. Defaults to true.

• data - An object containing data used to generate the chart. The structure of this object depends on chart type. Please refer to the Chartist Api Documentation for complete details.

For bar and line charts, this object contains the following properties
- labels - An array of string labels to apply to each value.
- series - An array of arrays or objects containing the values to plot. If objects are used, the following properties are supported:

- `name` - A string specifying the name of the series. The name will be used in the legend and will be set as the ct:series-name attribute on the series group.

- `value` - An array of values for the series.

- `className` - A string to override the CSS class name for the series group.

- `meta` - Meta data is serialized and written to a ct:meta attribute on the series group.

Examples:

```js
const data = {
  labels: ['a', 'b', 'c', 'd', 'e'],
  series: [
    [1, 2, 3, 4, 5],
    [3, 4, 5, 6, 7]
  ]
};
```

```js
const data = {
  labels: ['a', 'b', 'c', 'd', 'e'],
  series: [
    {name: 'Series 1', value: [1, 2, 3, 4, 5]},
    {name: 'Series 2', value: [3, 4, 5, 6, 7]}
  ]
};
```

For pie charts, this object contains the following properties:
- series - An array of values or objects containing values to plot. If objects are used, the following properties are supported:

- `name` - A string specifying the name of the series. The name will be used in the legend and will be set as the ct:series-name attribute on the series group.

- `value` - An array of values for the series.

- `className` - A string to override the CSS class name for the series group.

- `meta` - Meta data is serialized and written to a ct:meta attribute on the series group.

Examples:

```js
const data = {
  series: [ 15, 25 ]
};
```

```js
const data = {
  series: [
    {name: 'Series 1', value: 15 },
    {name: 'Series 2', value: 25 }
  ]
};
```

Examples
Bar:

co(function * () {
  const options = {
    width: 400,
    height: 200,
    axisX: { title: 'X Axis (units)' },
    axisY: { title: 'Y Axis (units)' }
  };

  const bar = yield generate('bar', options, {
    labels: ['a', 'b', 'c', 'd', 'e'],
    series: [
      {name: 'Series 1', value: [1, 2, 3, 4, 5]},
      {name: 'Series 2', value: [3, 4, 5, 6, 7]}
    ]
  });
})

Line:

co(function * () {
  const options = {
    width: 400,
    height: 200,
    axisX: { title: 'X Axis (units)' },
    axisY: { title: 'Y Axis (units)' }
  };

  const line = yield generate('line', options, {
    labels: ['a', 'b', 'c', 'd', 'e'],
    series: [
      {name: 'Series 1', value: [1, 2, 3, 4, 5]},
      {name: 'Series 2', value: [3, 4, 5, 6, 7]}
    ]
  });
})

Pie:

co(function * () {
  const options = { width: 400, height: 200 };

  const pie2 = yield generate('pie', options, {
    series: [
      {name: 'Series 1', value: 15 },
      {name: 'Series 2', value: 25 }
    ]
  });
})