Python check if textbox is not filled

Question

Currently I'm using Python tkinter to build a GUI that require user to enter the detail into the textbox(txt3)

How do I validate if the textbox is entered. If not entered, should show message "please enter textbox" . If entered, it will go through SaveInDB() to save in database.

def SaveInDB():
    subID=(txt3.get())
    if not (subID is None):
        ...my code here to save to db
    else:
        res = "Please enter textbox"
        message.configure(text= res)`

txt3 = tk.Entry(window,width=20)
txt3.place(x=1100, y=200)

saveBtn = tk.Button(window, text="Save", command=SaveInDB ,width=20 )
saveBtn .place(x=900, y=300)

This code above does not work for me..Please help

Your code is not clear for me but just checking whether "txt3" is None, is not good method because you wouldn't consider white spaces or unexpected inputs if it is important. — madogan
– madogan, Commented Apr 17, 2019 at 5:39
@madogan which method do you prefer in order to consider in whitespaces because I want to make the textbox compulsory to be entered — newlearner
– newlearner, Commented Apr 17, 2019 at 5:47
@madogan I had already update my code with textbox and button, please help to check what should I do in order to validate the textbox — newlearner
– newlearner, Commented Apr 17, 2019 at 5:58

Bitto · Accepted Answer · 2019-04-17 06:03:54Z

2

You can check if the entry has any value and if not use showinfo to display a popup message. If you don't want a popup you can simply set the focus like entry.focus() or highlight the background with a different color. A minimal example of what you are trying to accomplish.

import tkinter as tk
from tkinter.messagebox import showinfo

def onclick():
    if entry.get().strip():
        print("Done")
    else:
        showinfo("Window", "Please enter data!")
        #or either of the two below
        #entry.configure(highlightbackground="red")
        #entry.focus()

root = tk.Tk()
entry = tk.Entry(root)
entry.pack()
tk.Button(root, text='Save', command=onclick).pack()
root.mainloop()

Pop up version

Focus version

Background color version

edited Apr 17, 2019 at 6:03

answered Apr 17, 2019 at 5:43

Bitto

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1 Comment

newlearner Over a year ago

Thank you so much for the help , finally it's working as I wanted :)

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