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

0 vote187 views1 answer
Discord bot response to private message python
Python
0 vote220 views1 answer
Then generate Django project from the project template of cookiecutter
Python
0 vote243 views1 answer
Split a pd dataframe
Python
0 vote244 views1 answer
MULTIPLE Model Search in Django rest framework
Python Django
1 vote196 views1 answer
Python for/else
Python
0 vote223 views1 answer
Next function with inherited list python
Python
0 vote208 views2 answers
Jupyter notebook morse code francais
Python
0 vote238 views2 answers
Some problem occurred shows payubiz
Python
0 vote220 views1 answer
KeyError: "'__name__' not in globals" django
Python
0 vote225 views2 answers
Stable version of django
Python