README.rst

lona-chartjs

This package contains Chart.js bindings for Lona

Installation

$ pip install lona-chartjs

Usage

lona_chartjs.html.Chart defines a thin wrapper around the Javascript API of Chart.js. You can take any demo off chartjs.org <https://www.chartjs.org/docs/3.5.0/> and pass the chart config into Chart.data.

All data you passed in is available in Chart.data and can be reset and altered. To redraw the chart with altered data run self.show(chart) from your view.

from lona.html import HTML, H1, H2
from lona import App, View

from lona_chartjs.html import Chart

app = App(__file__)


BAR_CHART_DATA = {
    # Taken from https://www.chartjs.org/docs/latest/getting-started/usage.html

    'type': 'bar',
    'data': {
        'labels': ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
        'datasets': [{
            'label': '# of Votes',
            'data': [12, 19, 3, 5, 2, 3],
            'backgroundColor': [
                'rgba(255, 99, 132, 0.2)',
                'rgba(54, 162, 235, 0.2)',
                'rgba(255, 206, 86, 0.2)',
                'rgba(75, 192, 192, 0.2)',
                'rgba(153, 102, 255, 0.2)',
                'rgba(255, 159, 64, 0.2)'
            ],
            'borderColor': [
                'rgba(255, 99, 132, 1)',
                'rgba(54, 162, 235, 1)',
                'rgba(255, 206, 86, 1)',
                'rgba(75, 192, 192, 1)',
                'rgba(153, 102, 255, 1)',
                'rgba(255, 159, 64, 1)'
            ],
            'borderWidth': 1
        }]
    },
    'options': {
        'responsive': False,
        'scales': {
            'y': {
                'beginAtZero': True,
            }
        }
    }
}


@app.route('/')
class MyLonaView(View):
    def handle_request(self, request):
        html = HTML(
            H1('Hello World'),
            H2('Bar Chart'),
            Chart(
                width='500px',
                height='300px',
                data=BAR_CHART_DATA,
            ),
        )

        return html


app.run()