CODEWITHSUNDEEP
pythontkintertkinter-entry
Lucas896547
Lucas896547

Reputation: 29

Tkinter entry widget wont take input when using notebook

I am trying to get input from an entry widget using Python Tkinter using Notebook. I have managed to get it to work on my main canvas but as soon as I introduced tabs, it would not work. I am clearly missing something linking the .get function to the correct location but I can't work out what. Any ideas?

import tkinter 
import win32api
from tkinter import ttk 

checklist = tkinter.Tk()

checklist.title("My Checklist")
ScreenWidth=checklist.winfo_screenwidth()
ScreenHeight=checklist.winfo_screenheight()
checklist.geometry("%dx%d+0+0" % (ScreenWidth, ScreenHeight))

count = 0
tasks = []

tabcontrol = ttk.Notebook(checklist, width = 500, height = 500)
tab = ttk.Frame(tabcontrol)
tabcontrol.add(tab, text = "Checklist Home Page")
tabcontrol.grid(row = 0, column = 0)

main_canvas = tkinter.Canvas(checklist, width = 1000, height = 1000, highlightbackground="green")
main_canvas.grid(row=1, column = 0)
main_canvas.columnconfigure(3)
main_canvas.rowconfigure(6)

def create_checklist():
        global count
        count += 1
        if count > 10:
            win32api.MessageBox(0, 'Maximum number of checklists made!')
        else:
            tab = ttk.Frame(checklist, width = 500, height = 500)
            tabcontrol.add(tab, text = count)
            tabcontrol.grid(row = 0, column = 0)
            button_add_task = tkinter.Button(tab, text="Add task", width=20, height=1, bg="purple", command=add_task).grid(row = 2, column= 2, pady = (100, 1))
            item_entry = tkinter.Entry(tab).grid(row=6, column =2)    
            list_items = tkinter.Listbox(tab)
            list_items.grid(row =7, column =2, pady=10)

def add_task():
    task = item_entry.get()
    if task !="":
        tasks.append('- ' + task)
        update_listbox()

button_create_checklist = tkinter.Button(main_canvas, text="New Checklist", width=20, height=1, bg = "purple", command=create_checklist).grid(row = 3, column = 2, pady = 1 )

checklist.mainloop()

My error is currently:

 Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\lucas\anaconda3\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:\Users\lucas\OneDrive\Documents\Employability\untitled0999py.py", line 40, in add_task
    task = item_entry.get()
NameError: name 'item_entry' is not defined

Upvotes: 0

Views: 666

Answers (1)

Devansh Soni
Devansh Soni

Reputation: 771

Since item_entry is local variable of function create checklist(), it can't be used in add_task() function. So, we'll pass value of Entry field whenever Add Task button is pressed. To do so, we can use lambda expression in command option of Button. There are some minor changes in add_task() function.

Remember: grid is used to organize widgets and it returns None, so item_entry will be a NoneType object in your code and using get() with it will raise AttributeError. So, we need to replace

item_entry = tkinter.Entry(tab).grid(row=6, column =2)

with 

item_entry = tkinter.Entry(master=tab)    
item_entry.grid(row=6, column =2)

This code works Fine:

def create_checklist():
        global count
        count += 1
        if count > 10:
           win32api.MessageBox(0, 'Maximum number of checklists made!')
        else:
            tab = ttk.Frame(checklist, width = 500, height = 500)
            tabcontrol.add(tab, text = count)
            tabcontrol.grid(row = 0, column = 0)
            item_entry = tkinter.Entry(master=tab)    # Changes in
            item_entry.grid(row=6, column =2)         # these lines
            button_add_task = tkinter.Button(tab, text="Add task", width=20, height=1, bg="purple", command=lambda :add_task(item_entry.get())).grid(row = 2, column= 2, pady = (100, 1))
            list_items = tkinter.Listbox(tab)
            list_items.grid(row =7, column =2, pady=10)


def add_task(task):
    if task !="":
        tasks.append('- ' + task)
        update_listbox()

Hope this helps.

Upvotes: 2

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