How can I run a Python script when an HTML page is loaded?
Question
I want to make a variable with Python, and then console.log() the variable in JavaScript. I know how to access the variable in JavaScript, but I don't know how to make the Python script run when the page is loaded. How can I do this?
1 answers
solution1
1 ACCPTED 2020-10-27 20:09:46
Unlike Javascript, you can't run Python directly in the browser. You would need Python to run server-side. A possible alternative may be to use transcrypt to generate javascript equivalents of Python for a frontend-only solution.
For instance, transcrypt allows you to "import" python modules into JavaScript. Here, a python script called hello.py is "imported" into the context and can be called form javascript like hello.solarSystem.greet()
<script type="module">import * as hello from './__target__/hello.js'; window.hello = hello;</script>
<h2>Hello demo</h2>
<p>
<div id = "greet">...</div>
<button onclick="hello.solarSystem.greet ()">Click me repeatedly!</button>
<p>
<div id = "explain">...</div>
<button onclick="hello.solarSystem.explain ()">And click me repeatedly too!</button>
See the transcrypt docs for more info.
Otherwise, you'd probably be running a Python webserver on the backend for this use-case. Something like flask .
from flask import Flask, render_template_string
app = Flask(__name__)
def do_something():
"""Returns an interesting value"""
return "foo"
template = """
<html>
<script>
console.log('{{ value }}')
</script>
"""
@app.route('/')
def home():
my_value = do_something()
return render_template_string(template, value=my_value)
app.run(debug=True)
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