CODEWITHSUNDEEP
python-3.xtkintercheckbox
Adrian
Adrian

Reputation: 784

Gather input from multiple tkinter checkboxes created by a for loop

I made an application with tkinter which creates a list of checkboxes for some data. The checkboxes are created dynamically depending on the size of the dataset. I want to know of a way to get the input of each specific checkbox.

Here is my code, which you should be able to run.

from tkinter import *

root = Tk()

height = 21
width = 5

for i in range(1, height):
    placeholder_check_gen = Checkbutton(root)
    placeholder_check_gen.grid(row=i, column=3, sticky="nsew", pady=1, padx=1)

for i in range(1, height):
    placeholder_scope = Checkbutton(root)
    placeholder_scope.grid(row=i, column=4, sticky="nsew", pady=1, padx=1)

root.mainloop()

I looked over other answers and some people got away by defining a variable inside the checkbox settings "variable=x" and then calling that variable with a "show():" function that would have "variable.get()" inside. If anyone could please point me in the right direction or how I could proceed here. Thank you and much appreciated.

Upvotes: 0

Views: 826

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385940

Normally you need to create an instance of IntVar or StringVar for each checkbutton. You can store those in a list or dictionary and then retrieve the values in the usual way. If you don't create these variables, they will be automatically created for you. In that case you need to save a reference to each checkbutton.

Here's one way to save a reference:

self.general_checkbuttons = {}
for i in range(1, self.height):
    cb = Checkbutton(self.new_window)
    cb.grid(row=i, column=3, sticky="nsew", pady=1, padx=1)
    self.general_checkbuttons[i] = cb

Then, you can iterate over the same range to get the values out. We do that by first asking the widget for the name of its associated variable, and then using tkinter's getvar method to get the value of that variable.

for i in range(1, self.height):
    cb = self.general_checkbuttons[i]
    varname = cb.cget("variable")
    value = self.root.getvar(varname)
    print(f"{i}: {value}")

Upvotes: 2

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