tab7.py

import dash
import dash_daq as daq
import sys
from dash import dcc
from dash import html
import time
from dash.dependencies import Input, Output
from server import app
from flask import request

def tab7():

    tab7 = html.Div([ 
        html.H1(
        children='Thanks for using LabDash, see you back soon!',
        style={'textAlign':'center', 'padding':'10px'}
        ),
        html.Button(
            id='exit', 
            children='Click to confirm exit',
            style={'textAlign':'center', 'padding':'10px', 'backgroundColor':'red', 'fontWeight':'bold', 'width':300}),
        html.P(
        children='Always exit the program by clicking the red button, this prevents processes running after browser window is closed.',
        style={'textAlign':'center', 'padding':'10px'}
        ),
        ],style={'textAlign':'center'}),
    return tab7

@app.callback(Output(component_id='exit', component_property='children'), 
    Input(component_id='exit', component_property='n_clicks'
        ))
def prog_exit(n):

    if (n != None): 
        shutdown()
        return 'Program closed'
    else:
        return 'Click to confirm exit'

def shutdown():
    func = request.environ.get('werkzeug.server.shutdown')
    
    if func is None:
        raise RuntimeError('Not running with the Werkzeug Server')
    func()