Updating a customtkinter Label after input is placed into an Entry field-CodePudding

Programming a Private YouTube video downloader and I want the title and views on the UI to update when I put a new YouTube link into the field. Code:

import customtkinter as tk
from script import *
from pytube import YouTube



root = tk.CTk()
root.geometry('690x700')
root.title('YouTube to Video Converter')
tk.set_appearance_mode('System')
tk.set_default_color_theme('YT_Downloader/theme.json')
red = '#E70000'
red_selected ='#AB0000'
yt = YouTube('https://www.youtube.com/watch?v=7yn-0-1GIrk')
frame = tk.CTkFrame(master=root,corner_radius=10)
frame.grid(row=0,column=0, padx=20, pady=20)

title = tk.CTkLabel(frame, text = 'YouTube to Video Converter', font =('Roboto', 50))
title.grid(row=1, column=0,columnspan=3, pady=10, padx = 12, sticky='nsew')
url = tk.CTkEntry(frame, placeholder_text='https://www.youtube.com/watch?v=7yn-0-1GIrk', font=('Roboto', 12),width=250, height=20)
url.grid(row=3, column=2, columnspan=2, padx=10, pady=12)

video_name = tk.CTkLabel(frame, text=(f'Title: {yt.title}'), font=('Roboto', 18))
video_name.grid(row=2, column=0, columnspan=2, padx=5)

video_views = tk.CTkLabel(frame, text=(f'Views: {yt.views}'), font=('Roboto', 18))
video_views.grid(row=3, column=0, columnspan=2, padx=5)
while 1==1:
    if len(url.get()) == 0:
        yt = YouTube('https://www.youtube.com/watch?v=7yn-0-1GIrk')
    else:
        yt = YouTube(url.get().strip())
        root.update_idletasks()
        #video_name.config(text=(f'Title: {yt.title}'))
        #video_views.config(text=(f'Views: {yt.views}'))

def egt():
    print(url.get())
    print(len(url.get()))


enter_url = tk.CTkLabel(frame, text='Please Insert your URL in the Box Below', font=('Roboto', 18))
enter_url.grid(row=2, column=2, columnspan=2, padx=5)


button = tk.CTkButton(frame, text='Convert', font=('roboto', 18), command=egt )
button.grid(row=5, column=2)
root.mainloop()

Script.py:

from pytube import *

yt=''

def Process():
    try:
        stream = yt.streams.get_highest_resolution()
        stream.download('YT_Downloader/videos')
    except Exception:
        stream = yt.streams.get_highest_resolution()
        stream.download('YT_Downloader/videos')

I'm not sure what else to do other than putting it into an infinite while loop like shown above which doesn't launch the program at all.

CodePudding user response：

You can attach a callback to a stringvariable, which is called everytime the variable is updated. In your case you could do something like:

def callback(str_var):
    # Set your label here. The string is accessible through str_var.get()
    print(str_var.get())

url_var=StringVar()

url = tk.CTkEntry(frame, placeholder_text='https://www.youtube.com/watch?v=7yn-0-1GIrk', font=('Roboto', 12),width=250, height=20
textvariable=url_var)

url_var.trace("w", lambda name, index, mode, url_var=url_var: callback(url_var))