Embedding An Html Page Inside Flask
Solution 1:
Basically you need to create a view which will serve as static image, and you get the image url from that route.
I haven't got your included library so I'm going to use matplotlib and numpy to simulate what you are trying to attempt. This isn't a FULL solution for you (it's in the simplest working way using 2 views and 1 simple template), but you should be able to understand all the ESSENTIAL techniques which let you finish off your page. I have a few comments and guidelines, and I think the code itself is pretty much self explanatory.
OK, here is the view main.py:
from flask import Flask, render_template, request, send_file
import matplotlib.pyplot as plt
import numpy as np
from StringIO import StringIO
app = Flask(__name__)
@app.route('/plot/')
def plot():
try:
# try to get the query string like ?width=xxx&height=xxx
height = int(request.args.get('height'))
width = int(request.args.get('width'))
except ValueError:
# if height, width not available, set a default value
height, width = 100, 100
# I randomly generate the plot which just based on H x W
# you should be able to generate yours from your library
to_draw = np.random.randint(0, 255, (height, width))
img = plt.imshow(to_draw)
# you can convert the graph to arrays and save to memory
imgIO = StringIO()
img.write_png(imgIO, noscale=True) # save to memory
imgIO.seek(0)
# and send that image as file as static file of url
# like... /plot/?width=100&height=100
return send_file(imgIO, mimetype='image/png')
# this is the main page with the form and user input
@app.route('/', methods=['GET', 'POST'])
def index():
# set the default values
height, width = 100, 100
# handle whenever user make a form POST (click the Plot button)
if request.method == 'POST':
try:
# use this to get the values of user input from the form
height = int(request.form['height'])
width = int(request.form['width'])
except ValueError:
pass
# and pass the context back to the template
# if no form is POST, default values will be sent to template
return render_template('index.html', height=height, width=width)
if __name__ == '__main__':
app.debug = True
app.run()
And the template at templates/index.html:
<html>
<head>
<title>Micro Plot!</title>
</head>
<body>
<h1>Interactive Plot</h1>
<form action="/" name="plot" method="POST">
<p><input type="text" name='height' value="{{ height }}" /></p>
<p><input type="text" name='width' value="{{ width }}" /></p>
<p><input type="submit" value="Plot Now!"></p>
</form>
<img src="{{ url_for('plot', height=height, width=width) }}" />
</body>
</html>
The trick is to set the image src to send a GET request to the url, and then Flask's /plot/ view to render an in-memory image and feed back as static.
Key Notes:
The url_for will then dynamically generate the src as like /plot/?width=xxx&height=xxx.
To get the querystring from the url in the view, use request.args.get('KeyName').
Once your plot is ready, save it in the memory with Python StringIO module and use Flask's send_file to serve as static content.
You should read and learn more about Flask and HTML, you cannot build something really amazing without having a good understanding of how these things work together.
I hope this helps you understand the underlying techniques, and Good Luck!
Solution 2:
I ended up creating my own answer with the help of elyase, and the code was pulled into an example folder in the bokeh project. Check it out here:
https://github.com/bokeh/bokeh/tree/master/examples/embed/simple
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