Easily embed Chart.js charts in Flask apps via jinja from the backend
Project description
FlaskGraph
FlaskGraph makes it dead simple to drop Chart.js charts into your Flask app without touching JavaScript. You just write Python, pass it to your template, and you're done.
🔧 Installation
pip install flaskgraph
⚡ Quickstart
1. Import & Use in Flask
from flaskgraph import graph
@app.route("/")
def dashboard():
chart = graph.bar(
['Jan', 'Feb', 'Mar'],
[27, 35, 12],
legend=False,
label_color='standard',
grid=False,
colortheme='sky'
)
return render_template("dashboard.html", chart=chart)
2. In Your Template
Include Chart.js in your HTML <head>:
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
Render the chart inside a container with a set width (the canvas is included automatically):
<div style="width: 100%; max-width: 600px;">
{{ chart|safe }}
</div>
📊 Supported Chart Types
graph.bar(labels, data, ...)
graph.line(labels, data, ...)
graph.donut(labels, data, ...)
graph.scatter(labels, data, ...)
Each method returns a fully ready-to-render HTML <canvas> with a Chart.js config script.
🎨 Parameters
| Parameter | Type | Description |
|---|---|---|
labels |
list | X-axis labels |
data |
list | Y-axis values |
label_color |
str | Label color: "standard", "dark", or "light" |
legend |
bool | Show/hide the legend |
grid |
bool | Show/hide background grid lines |
colortheme |
str | One of the predefined themes below |
🌈 Available Color Themes
blue, green, red, yellow, orange,
purple, pink, teal, sky, lime,
slate, gray, zinc,
neon-green, neon-pink, neon-blue
✅ Example
revenue = graph.line(
['Q1', 'Q2', 'Q3', 'Q4'],
[5000, 7000, 4000, 6500],
label_color='dark',
legend=True,
grid=True,
colortheme='lime'
)
<div style="max-width: 700px;">
{{ revenue|safe }}
</div>
That's it. No JavaScript. No extra config.
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