登录按钮功能

Question

我正在 python 中试验 tkinter。

目前我创建了一个脚本，它创建了一个登录名 window，但它从来没有任何功能。我试过 def callback(): 和 command=callback。所以我试着让它在你按下 "Login" 按钮时，你可以做一些事情（例如显示加载...和清除文本框。）

代码如下：

import tkinter

window = tkinter.Tk()
window.title("Login")
window.geometry("250x150")
window.configure(background="#FFFFFF")

label = tkinter.Label(window, text="Please Login to continue:", bg="#FFFFFF", font=("PibotoLt", 16))
label.pack()
label = tkinter.Label(window, text="username:", bg="#FFFFFF")
label.pack()
entry = tkinter.Entry(window)
entry.pack()
label = tkinter.Label(window, text="password:", bg="#FFFFFF")
label.pack()
entry = tkinter.Entry(window)
entry.pack()

def callback():
    button = tkinter.Button(window, text="Login", fg="#FFFFFF", bg="#000000")
    button.pack()
    label = tkinter.Label(window, text="Loading...", bg="#FFFFFF", command=callback)

window.mainloop()

Answer 1

存在三个问题：

需要将回调函数分配给按钮小部件上的命令选项。
两个入口小部件在回调中需要不同的变量名才能访问
回调函数需要一段代码来做某事。

代码应该是

import tkinter

window = tkinter.Tk()

window.title("Login")
window.geometry("250x150")
window.configure(background="#FFFFFF")

label = tkinter.Label(window, text="Please Login to continue:", bg="#FFFFFF", font=("PibotoLt", 16))
label.pack()
label = tkinter.Label(window, text="username:", bg="#FFFFFF")
label.pack()
entry0 = tkinter.Entry(window) # Renamed entry0 to find in callback
entry0.pack()
label = tkinter.Label(window, text="password:", bg="#FFFFFF")
label.pack()
entry1 = tkinter.Entry(window) # Renamed entry1 to differentiate from entry0
entry1.pack()

def callback():
    """ Callback to process a button click. This will be called whenever the button is clicked.
        As a simple example it simply prints username and password.
    """
    print("Username: ", entry0.get(), "    Password: ", entry1.get())

button = tkinter.Button(window, text="Login", fg="#FFFFFF", bg="#000000", command=callback)
button.pack()

window.mainloop()

登录按钮功能

Login Button Function

python

tkinter

raspberry-pi3