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merged 3 commits into from
Nov 30, 2022
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More flask documentation #1675

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52959ac
More Flask documentation
Conengmo Nov 30, 2022
cf2427d
don't use iframe in simple example
Conengmo Nov 30, 2022
d9355f8
put examples in script
Conengmo Nov 30, 2022
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8 changes: 5 additions & 3 deletions docs/flask.rst
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@@ -1,9 +1,11 @@
Using folium with flask
=======================

A very common use case is to use folium with in a flask app.
The trick is to return folium's HTML representation.
Here is an example on how to do that:
A common use case is to use folium in a flask app. There are multiple ways you
can do that. The simplest is to return the maps html representation. If instead
you want to embed a map on an existing page, you can either embed an iframe
or extract the map components and use those.

Below is a script containing examples for all three use cases:

.. literalinclude:: ../examples/flask_example.py
70 changes: 65 additions & 5 deletions examples/flask_example.py
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Expand Up @@ -14,18 +14,78 @@

"""

from flask import Flask
from flask import Flask, render_template_string

import folium

app = Flask(__name__)


@app.route("/")
def index():
start_coords = (46.9540700, 142.7360300)
folium_map = folium.Map(location=start_coords, zoom_start=14)
return folium_map._repr_html_()
def fullscreen():
"""Simple example of a fullscreen map."""
m = folium.Map()
return m.get_root().render()


@app.route("/iframe")
def iframe():
"""Embed a map as an iframe on a page."""
m = folium.Map()

# set the iframe width and height
m.get_root().width = "800px"
m.get_root().height = "600px"
iframe = m.get_root()._repr_html_()

return render_template_string(
"""
<!DOCTYPE html>
<html>
<head></head>
<body>
<h1>Using an iframe</h1>
{{ iframe|safe }}
</body>
</html>
""",
iframe=iframe,
)


@app.route("/components")
def components():
"""Extract map components and put those on a page."""
m = folium.Map(
width=800,
height=600,
)

m.get_root().render()
header = m.get_root().header.render()
body_html = m.get_root().html.render()
script = m.get_root().script.render()

return render_template_string(
"""
<!DOCTYPE html>
<html>
<head>
{{ header|safe }}
</head>
<body>
<h1>Using components</h1>
{{ body_html|safe }}
<script>
{{ script|safe }}
</script>
</body>
</html>
""",
header=header,
body_html=body_html,
script=script,
)


if __name__ == "__main__":
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