CODEWITHSUNDEEP
pythontkinterreal-time-data
Akash S Vidhyaniketan
Akash S Vidhyaniketan

Reputation: 13

Getting real time data in Tkinter

Consider the code below:

from tkinter import *

screen = Tk()

e =Entry()
e.pack()


screen.mainloop()

Now how to get to display the length of the characters entered in the e entry widget in real-time? It doesn't matter if the data is displayed in the GUI or Corresponding terminal

Upvotes: 0

Views: 1781

Answers (1)

Delrius Euphoria
Delrius Euphoria

Reputation: 15088

There are atleast 3 ways to do this here with one being better than the other:

  • Using trace from StringVar:
def func(*args):
    print(len(var.get()))

var = StringVar()

e = Entry(screen,textvariable=var)
e.pack()

var.trace('w',func)

Every time the value of var is changed, func will be called.

  • Using bind to each key release:
def func(*args):
    print(len(e.get()))

e.bind('<KeyRelease>',func)
  • Using after(ms,func) to keep repeating the function:
def func():
    print(len(e.get()))
    screen.after(500,func)

func()

As you can see, the first method is more efficient as it does not unnecessarily prints out values when you select all the items(with Ctrl+A) and so on. Using after() will be the most ridiculous method as it will keep printing the length always as there are no restrictions provided.

Upvotes: 2

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