I'm running a flask application where I get information from a user's uploaded CSV and I'm trying to take that data and pass it into a separate javascript file I have.
@app.route('/') is the route that gets the users csv file and sends it to the upload,html
main.py
from flask import Flask, render_template, request, url_for, redirect
import pandas as pd
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def upload():
if request.method == 'POST':
df = pd.read_csv(request.files.get('file'))
return render_template('upload.html', shape=df.shape)
return render_template('upload.html')
@app.route("/graph")
def graph():
return render_template("graph.html")
if __name__ == "__main__":
app.run(debug=True)
This javascript builds a sankey graph, it's connected to a css that formats it.
function.js
Highcharts.chart('container', {
title: {
text: 'Highcharts Sankey Diagram'
},
accessibility: {
point: {
descriptionFormatter: function (point) {
var index = point.index + 1,
from = point.from,
to = point.to,
weight = point.weight;
return index + '. ' + from + ' to ' + to + ', ' + weight + '.';
}
}
},
series: [{
keys: ['from', 'to', 'weight'],
data: [
['Brazil', 'Portugal', 5],
['Brazil', 'France', 1],
['Brazil', 'Spain', 1],
['Brazil', 'England', 1],
['Canada', 'Portugal', 1],
['Canada', 'France', 5],
['Canada', 'England', 1],
['Mexico', 'Portugal', 1],
['Mexico', 'France', 1],
['Mexico', 'Spain', 5],
['Mexico', 'England', 1],
['USA', 'Portugal', 1],
['USA', 'France', 1],
['USA', 'Spain', 1],
['USA', 'England', 5],
['Portugal', 'Angola', 2],
['Portugal', 'Senegal', 1],
['Portugal', 'Morocco', 1],
['Portugal', 'South Africa', 3],
['France', 'Angola', 1],
['France', 'Senegal', 3],
['France', 'Mali', 3],
['France', 'Morocco', 3],
['France', 'South Africa', 1],
['Spain', 'Senegal', 1],
['Spain', 'Morocco', 3],
['Spain', 'South Africa', 1],
['England', 'Angola', 1],
['England', 'Senegal', 1],
['England', 'Morocco', 2],
['England', 'South Africa', 7],
['South Africa', 'China', 5],
['South Africa', 'India', 1],
['South Africa', 'Japan', 3],
['Angola', 'China', 5],
['Angola', 'India', 1],
['Angola', 'Japan', 3],
['Senegal', 'China', 5],
['Senegal', 'India', 1],
['Senegal', 'Japan', 3],
['Mali', 'China', 5],
['Mali', 'India', 1],
['Mali', 'Japan', 3],
['Morocco', 'China', 5],
['Morocco', 'India', 1],
['Morocco', 'Japan', 3]
],
type: 'sankey',
name: 'Sankey demo series'
}]
});
This is the html file that currently displays the shape variable from main.py
upload.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form method=post enctype=multipart/form-data>
<input type=file name=file>
<input type=submit value=Upload>
</form>
Shape is: {{ shape }}
</body>
</html>
graph.html
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Flask Tutorial</title>
</head>
<body>
<figure class="highcharts-figure">
<div id="container"></div>
<p class="highcharts-description">
Sankey charts are used to visualize data flow and volume
between nodes. The wider lines indicate larger volumes.
</p>
</figure>
</body>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/sankey.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>
<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='css/template.css') }}">
<script src="{{ url_for('static', filename='function.js') }}"></script>
</html>
Thanks!
更新:我解决这个问题的方法是简单地将 javascript 嵌入到 html 中,我找不到更好的方法来做到这一点。
I had the same question and arrived at here, for now the answer I found is to convert csv file to json (json.dump) and send it to independent JS file in static folder. This article gives full explanation: https://towardsdatascience.com/combining-python-and-d3-js-to-create-dynamic-visualization-applications-73c87a494396
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