How to modify a Label when writing in Entry in tkinter?

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How to modify a Label when writing in Entry in tkinter?

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#1 by (0 votes)

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I would like to make a program that detects the change in the Entry text and changes the Label to the same Entry text, how can I do this?

from tkinter import *

# Configurações da Tela
window = Tk()
window.title("Hello World")  
window.resizable(width=False, height=False)
window.geometry("300x300")

TextoLabel = StringVar()
TextoLabel.set("AAAAAA")
#Criando uma funcao para dar update na Label


# Widgets
entrada = Entry(window)
lbl = Label(textvariable = TextoLabel)
b = Button(text="see ya?!")

# Mostrar todos os itens na tela
b.pack()
entrada.pack()
lbl.pack()
window.mainloop()

while True:
    if entryname.get() == "":
        TextoLabel.set("Nada")
        window.update_idletasks()
    else:
        TextoLabel.set(entryname.get())
        window.update_idletasks()

python-3.x tkinter

asked by anonymous 17.07.2015 / 16:11

1 answer

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score 0 · Answer 1

To begin, I advise against using loops in tkinter, because they will interfere with mainloop .

What you want to do can be done in at least two ways:

Using the same object StringVar is for the object Entry and for Label , which is as simple as the following:

from tkinter import *


root = Tk()

prompt = Label(root, text="Insere algo")
prompt.pack(side="left")

entry_content = StringVar()

# Associando "entry_content" a propriedade "textvariable".
# O que escreves no "entry" é "absorvido" pelo "entry_content"

entry = Entry(root, textvariable=entry_content) 
entry.pack(side="left")

# O valor do "entry_content" é modificado no "entry"
# E essa modificação vai-se refletir nesta "label"    

label = Label(root, text="", textvariable=entry_content)
label.pack(side="left")

root.mainloop()

Do not use an object StringVar , but bind a call to a function with a certain event, in which case the event is <KeyRelease> , which almost happens when you stop loading a key. In this function you can type control the contents of the Label and compare it with the contents of the Entry.

from tkinter import *


root = Tk()

prompt = Label(root, text="Insere algo")
prompt.pack(side="left")

entry = Entry(root)
entry.pack(side="left")


def on_key_pressing(event, entry, label):
    print(entry.get(), label.cget("text"))
    if entry.get() != label.cget("text"):
        label.config(text=entry.get())

# Associando o evento <Key> com a chamada
# a funcão on_key_pressing
entry.bind("<KeyRelease>", lambda e: on_key_pressing(e, entry, label))

label = Label(root, text="")
label.pack(side="left")

root.mainloop()

If you do not understand something, ask in the comments, and I edit the answer;)