Call javascript function flask

from flask import Flask, render_template

app = Flask(__name__)


@app.route('/', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        #verify if the file is valid
        #here invoke js to do something (for example flash("test"))
        return render_template('upload.html', flash_message="True")

    return render_template('upload.html', flash_message="False")

Source: stackoverflow.com

Javascript function from python flask

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Upload new File</title>
</head>
<body onload="flashMessage()">
  <script>
    function flashMessage() {
      if ("{{ flash_message }}" == "True") {
        alert("[YOUR_MESSAGE_HERE]");
      }
    }
  </script>

  <h1>Upload new File</h1>
  <form method=post enctype=multipart/form-data>
    <input type=file name=file>
    <input type=submit value=Upload>
  </form>
</body>
</html>

Source: stackoverflow.com

Similar codes

2 votes192 views2 answers
Tkinter treeview
Python
0 vote238 views1 answer
Python integrated with activeX
Python
0 vote185 views1 answer
HTTP Error 403: Forbidden django using sendgrid
Python
0 vote183 views1 answer
Python - find columns that are objects
Python
23 votes401 views2 answers
Django rest
Python Django
0 vote306 views1 answer
Get end of string python
Python
0 vote232 views1 answer
Re python split()
Python
0 vote188 views1 answer
Ttk button
Python
13 votes183 views3 answers
Python program to calculate factorial of a number.
Python
1 vote218 views1 answer
Libreoffice add line in table
Python