I tried to execute the following code in my system, and the window does not respond if the submit button is clicked
import Tkinter as tk
from Tkinter import *
top=Tk()
text=Text(top)
def onsubmit():
a=v.get()
ea.textbox(text=a)
v=StringVar()
t=Entry(top, textvariable=v)
submit=Button(top,text="SUBMIT",command=onsubmit)
t.grid(row=0,column=0)
submit.grid(row=0,column=1)
text.grid(row=1,column=0)
top.mainloop()
If you run your script from terminal or just look at the text output of your program in some other way you will see the following error (just after pressing the button):
NameError: global name 'ea' is not defined
The error is on the second line of onsubmit function. Here is the working version:
def onsubmit():
a=v.get()
text.insert(INSERT, a)
Related
this might be a noob question but I have a simple script to monitor the current in my area which I use customtkinter as my GUI.
The script have two buttons which are Start and Restart. The Start button is to start the program and the Restart in to simply to Restart the whole code again which you could see on the snippet of the code below.
import sys
import os
#from tkinter import Tk, Label, Button
import customtkinter
def restart_program():
"""Restarts the current program."""
root.destroy()
os.startfile("testbed.py")
root = customtkinter.CTk()
#Label(root, text="Hello World!").pack()
#Button(root, text="Restart", command=restart_program).pack()
label = customtkinter.CTkLabel(root, text="Hello World!").pack()
button = customtkinter.CTkButton(root, text="Restart", command=restart_program).pack()
root.mainloop()
but when I clicked on the restart button it does not execute the os.startfile("testbed.py") part is there something wrong with my logic?
This question already has answers here:
Why is my Button's command executed immediately when I create the Button, and not when I click it? [duplicate]
(5 answers)
Closed last year.
I wanted to make button in tkinter, but when I started program, the command always calls when code just starts.
Here is example code:
import tkinter as tk
from tkinter import messagebox
window = tk.Tk()
window.title("Why this don't works???")
window.wm_geometry("100x100")
def message():
messagebox.showinfo("Hi there")
button = tk.Button(text="Hello", command=message())
button.grid(column=0, row=0)
while True:
window.update()
And then, button didn't worked. (When you press it, it don't works.)
I don't know what I'm doing wrong, so I need help.
The command should be a pointer to a function
In the code you wrote, the command gets the return value from the function.
command=message()
The correct way is
command = message
The problem is you are requesting a return value from the fucnction. Try using this.
from tkinter import *
# import messagebox from tkinter module
import tkinter.messagebox
# create a tkinter root window
root = tkinter.Tk()
# root window title and dimension
root.title("When you press a button the message will pop up")
root.geometry('75x50')
# Create a messagebox showinfo
def onClick():
tkinter.messagebox.showinfo("Hello World!.", "Hi I'm your message")
# Create a Button
button = Button(root, text="Click Me", command=onClick, height=5, width=10)
# Set the position of button on the top of window.
button.pack(side='top')
root.mainloop()
You have 2 errors:
first:
It must be command=message
second:
You must give a message argument too, you entered a title only.
Or, what you can do is.
Add another variable.
command = message()
Before this line,
button = tk.Button(text="Hello", command=message())
And chande this line to,
button = tk.Button(text="Hello", command=command)
I have a simple code (test.py) to generate a popup window as shown below. It works fine when I run it directly in console.
import tkinter as tk
from tkinter.messagebox import showinfo
def popup():
print("Hello World!")
root1 = tk.Tk()
b1 = tk.Button(root1, text="Print", command=popup)
b1.pack(fill='x')
root1.mainloop()
But when I call this code (test.py) from another py script by
exec(open('test.py').read())
It gives error message "can't invoke “event” command: application has been destroyed". I have checked the prior discussion on this topic, but it doesn't seem to help my case.
can't invoke "event" command: application has been destroyed
Can anybody please help? Thanks!
I am trying to get a Tkinter popup to display when a button is clicked.My issue is that every thing runs just fine except the popup will not produce. I have tried multiple ways to create the popup using tkMessagebox and Toplevel() but still not luck. The program runs but when the button is click nothing happens. I have referenced similar post but still can not find the issue in my code. Any thoughts?
from tkinter import *
def new():
root2 = Tk()
root2.geometry('250x250')
l = Label(root2,text="Please Scan Tag").pack()
root2.mainloop()
# setting main frame
root = Tk()
root.geometry('800x650')
root.title("Pass")
root.configure(background= "white")
label_0 = Label(root, text="Pass",width=10,font=("bold", 50),fg= "green",bg="white")
label_0.place(x=186,y=76)
Button(root,command="new", text='new',font=
("bold",15),width=15,height=4,bg='blue',fg='white').place(x=155,y=300)
root.mainloop()
The command option requires a reference to a callable function, not a string.
Button(root,command=new, ...)
How do I get a button working?
from tkinter import *
window=Tk()
window.title=title("Test")
button=button(window, text='Increase variable', command=Var)
button.pack()
variable=0
def Var():
variable=variable+1
I get an error saying Var is not defined. If I put the function before the button code I get an error when clicking the button.
from tkinter import *
variable=0
def Var():
variable=variable+1
window=Tk()
window.title=title("Test")
button=button(window, text='Increase variable', command=Var)
button.pack()
Clicking on the button will yield an error local variable referenced before assignment. How do I get this to work?
If variable is a global variable, you need to indicate to Var that this is the case.