另一个输入字段中两个输入的乘积作为默认值

Question

我只想把产品的产品数量和每单位价格的金额录入为默认值，我该怎么做呢？

程序代码为

import tkinter as tk
from tkinter import *
from PIL import Image, ImageTk
from tkinter import ttk
import mysql
import mysql.connector
from tkinter import messagebox
import datetime
from datetime import date
from ttkwidgets.autocomplete import AutocompleteCombobox



adde=Tk()     
frm3=Frame(adde)
frm3.place(x=191,y=0,relwidth=1,relheight=1)
frm3.configure(bg='#E5E4E2')

# Unit price
price = Label(frm3, text="Unit Price",bg='#E5E4E2', font=("times new roman", 10)).place(x=555, 
y=290)
price_01 = Entry(frm3)
price_01.place(x=555, y=310, width=70)

# Quantity
qty = Label(frm3, text="Quantity",bg='#E5E4E2', font=("times new roman", 10)).place(x=635, 
y=290)
qty_01 = Entry(frm3)
qty_01.place(x=635, y=310, width=60)

# Amount
amount = Label(frm3, text="Amount",bg='#E5E4E2', font=("times new roman", 10)).place(x=705, 
y=290)
amount_01 = Entry(frm3)
amount_01.place(x=705, y=310, width =100)

adde.title(" Voucher Entry ")
adde.geometry("1400x700")
adde.configure(bg='#659EC7')
adde.mainloop()

用户输入的价格、数量和金额条目应使用价格和数量的产品自动更新，用户不能编辑该条目...

Answer 1

我不完全清楚你需要什么，但如果我理解你，你需要创建function来处理产品的更新。在代码的GUI部分，您需要添加button并将updating funtion传递给它。

button= Button(window, height=1, width=10, text="UPDATE",
                          command=lambda: update_function(product, amount, price))
button_login.pack()

使用.get()从输入字段获取数据的内部函数

示例：

def update_function(product, amount, price):
    product_data = product.get()
    amount_data = amount.get()
    price_data  =price.get()
    # Rest of your code and updating DB code

因此，在上面的示例中，传递给update function的product, amount and price是entry fileds，所以通过使用.get()，您将获得在entry fileds中输入的数据。

Answer 2

您可以在price_01和qty_01上绑定<KeyRelease>事件，然后在事件回调中计算金额并更新amount_01。如果你不想让它可编辑，我建议将amount_01从Entry改为Label。

# avoid using wildcard import
import tkinter as tk

def calc_amount(event):
    try:
        price = float(price_01.get())
        qty = int(qty_01.get())
        amount_01['text'] = round(price * qty, 2)
    except ValueError as ex:
        # invalid input in price or qty
        # so clear amount_01
        amount_01['text'] = ''

adde = tk.Tk()

frm3 = tk.Frame(adde)
frm3.place(x=191, y=0, relwidth=1, relheight=1)
frm3.configure(bg='#E5E4E2')

# Unit price
tk.Label(frm3, text="Unit Price", bg='#E5E4E2', font=("times new roman", 10)).place(x=555, y=290)
price_01 = tk.Entry(frm3)
price_01.place(x=555, y=310, width=70)
price_01.bind('<KeyRelease>', calc_amount) # call calc_amount on key input
# Quantity
tk.Label(frm3, text="Quantity", bg='#E5E4E2', font=("times new roman", 10)).place(x=635, y=290)
qty_01 = tk.Entry(frm3)
qty_01.place(x=635, y=310, width=60)
qty_01.bind('<KeyRelease>', calc_amount) # call calc_amount on key input

# Amount
tk.Label(frm3, text="Amount",bg='#E5E4E2', font=("times new roman", 10)).place(x=705, y=290)
# change amount_01 from Entry to Label, so it is not editable
#amount_01 = Entry(frm3)
amount_01 = tk.Label(frm3, border=1, relief='sunken', bg='white', anchor='w')
amount_01.place(x=705, y=310, width =100)

adde.title(" Voucher Entry ")
adde.geometry("1400x700")
adde.configure(bg='#659EC7')
adde.mainloop()