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Flask-ChartJS
Flask-ChartJS provides a simple interface to use ChartJS javascript library with Flask.
Installation
Install the extension with pip:
pip install flask-chartjs
Usage
Once installed the Flask-ChartJS is easy to use.Let's walk through setting up a basic application. Also please note that this is a very basic guide: we will be taking shortcuts here that you should never take in a real application.
To begin we'll set up a Flask app:
import flask
app = flask.Flask(**name**)
Flask-ChartJS works via a login manager. To kick things off, we'll set up the login manager by instantiating it and telling it about our Flask app:
from flask_chartjs import ChartJS
chartjs = ChartJS()
chartjs.init_app(app)
This will make available the load_chartjs function into the templates context so you could load the javascript package easily, like this.
<head>
{{ load_chartjs() }}
</head>
Now we will construct a basic chart.
from flask_chartjs import Chart, DataSet
from flask import render_template
@app.get('/chart-example')
def chart_example():
chart = Chart('income-outcome', 'bar') # Requires at least an ID and a chart type.
dataset_income = DataSet('Income', [100,200,300])
dataset_outcome = DataSet('OutCome', [50,100,150])
chart.data.add_labels('jan', 'feb', 'mar')
chart.data.add_dataset(dataset_income)
chart.data.add_dataset(dataset_outcome)
return render_template('path/to/template.html', my_chart=chart)
Once created you can pass it to a render_template and use it likewise.
<!-- load_chartjs() must be called before this line -->
<div class="my-classes">{{ my_chart() }}</div>
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