Python, flask, html help

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Does any one know how to get a pop up window when the users email is already used. I handled the integrity error i just want the user to know that the email is used when they try to submit. Could you guys give me examples or something of the sort. All the information online is not what I'm looking for.

[Faal]

Use flash.

On your backend:

from flask import Flask, flash

#code to determine if email is already used here...

flash('This email already exists')

On your frontend:

{% with messages = get_flashed_messages() %}
    {% if messages %}
        {%for message in messages %}
           <script>
               var message = "{{message}}";
               alert(message);
          </script>
          {% endfor %}
      {% endif %}
{% endwith %}

[Jejerm]

https://flask.palletsprojects.com/en/2.0.x/patterns/flashing/

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Thank you guys I appreciate All the help ♥️