Get values from a variable number of entry boxes in Tkinter

Question

I have created a simple gui that displays a variable amount of floats from a given list as label widgets in one column and then a corresponding amount of entry boxes in the adjacent column. I am able to "get" the value of the last entry widget with no problem. However, I would like to "get" the values of all of the entry widgets. Ideally this would be a dictionary, but I’ll take any output at this point. I have looked at Is there anyway to get all the values of a Entry Widget that I put in a for loop?; Create variable number of Entry widgets with names from list; Tkinter get the text from entry boxes; Variable Number of Entry Fields in Tkinter; Get values from Entry widgets and create list of variables Tkinter; and many, many more, but none of these have really given a straight-forward answer or at least one that I can apply.

The amount of label/entry widgets can range from 1 to probably 15 with no way of knowing beforehand. Below is my code snippet.

import sys
import tkinter as tk
from tkinter import ttk

def share_cost_basis(fund, pool, price):
    def get_px(*args):
        # This is the issue part
        for p in price:
            my_px = float(p) * float(entry.get())
            print(my_px)
        # End issue part
        form.destroy()
        sys.exit(0)
    form = tk.Tk()
    form.update_idletasks()
    width = 400
    height = 450
    x = int((form.winfo_screenwidth() / 2) - (width / 2))
    y = int((form.winfo_screenheight() / 2) - (height / 2))
    form.geometry('{}x{}+{}+{}'.format(width, height, x, y))
    form.title('Cost Basis per Share Entry')
    form_label = ttk.Label(form, text=f'For the fund {pool} {fund}, please enter the number ofn'
                                      f' shares that were purchased at each price.n')
    form_label.grid(column=1, row=1, columnspan=4, sticky='E,W', pady=(20, 0), padx=(10, 0))
    px = tk.StringVar()
    for p in price:
        px.set(p)
        label_frame = ttk.LabelFrame(form, borderwidth=10, relief='sunken')
        row_num = price.index(p) + 2
        label_frame.grid(row=row_num, column=1, pady=5, sticky='e', columnspan=2)
        label = ttk.Label(label_frame, text=p)
        label.grid(row=row_num, column=1, columnspan=2)
        entry = ttk.Entry(form)
        entry.grid(row=row_num, column=3)
    ok_button = ttk.Button(form, text='OK', command=get_px)
    ok_button.grid(row=row_num+2, column=2)
    form.mainloop()

share_cost_basis('Test Fund', 'Test Pool', ['1.25', '2.50', '3.75', '5.00'])

Any and all help is appreciated.

Thanks!!

Asked By: AJames

||

Source

Answer 1

So the solution in this case for me would be to use a list to hold the entry fields and then check values based on index.

here is an example with your code modified to use a list.

import sys
import tkinter as tk
from tkinter import ttk


def share_cost_basis(fund, pool, price):
    def get_px(*args):
        for ndex, p in enumerate(price):
            # based on the index of your price list we also pull the value from the entry list
            my_px = float(p) * float(list_of_entry_fields[ndex].get())
            print(my_px)
        form.destroy()
        sys.exit(0)

    form = tk.Tk()
    form.update_idletasks()
    list_of_entry_fields = []  # Added a list to store entry fields
    width = 400
    height = 450
    x = int((form.winfo_screenwidth() / 2) - (width / 2))
    y = int((form.winfo_screenheight() / 2) - (height / 2))
    form.geometry('{}x{}+{}+{}'.format(width, height, x, y))
    form.title('Cost Basis per Share Entry')
    form_label = ttk.Label(form, text=f'For the fund {pool} {fund}, please enter the number ofn'
                                      f' shares that were purchased at each price.n')
    form_label.grid(column=1, row=1, columnspan=4, sticky='E,W', pady=(20, 0), padx=(10, 0))
    px = tk.StringVar()
    for p in price:
        px.set(p)
        label_frame = ttk.LabelFrame(form, borderwidth=10, relief='sunken')
        row_num = price.index(p) + 2
        label_frame.grid(row=row_num, column=1, pady=5, sticky='e', columnspan=2)
        label = ttk.Label(label_frame, text=p)
        label.grid(row=row_num, column=1, columnspan=2)
        # appending list of entry fields with each one in the loop
        list_of_entry_fields.append(ttk.Entry(form))
        # after appending we can use -1 to reference the last item appened
        list_of_entry_fields[-1].grid(row=row_num, column=3)
    ok_button = ttk.Button(form, text='OK', command=get_px)
    ok_button.grid(row=row_num+2, column=2)
    form.mainloop()

share_cost_basis('Test Fund', 'Test Pool', ['1.25', '2.50', '3.75', '5.00'])

Result:

Values printed to Console:

2.5
7.5
15.0
25.0

Answered By: Mike – SMT

Get values from a variable number of entry boxes in Tkinter

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