Python tkinter禁用按钮,直到所有字段都填满 [英] Python tkinter disable the button until all the fields are filled
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问题描述
假设我在tkinter中有2个输入小部件,1个选项菜单(下拉列表)和1个按钮.在用户填充所有3个小部件之前,如何将按钮小部件状态设置为已禁用"?
Let's say I have 2 entry widgets, 1 option menu(drop down list) and 1 button in tkinter. How can i set the button widget state to DISABLED until all 3 widgets are filled by the user?This is what i have currently:
import Tkinter as tk
root = tk.Tk()
entry1=tk.Entry(root,width=15).grid(row=1,column=1)
entry2=tk.Entry(root,width=15).grid(row=1,column=2)
choices=('a','b','c')
var=tk.StringVar(root)
option=tk.OptionMenu(root,var,*choices)
option.grid(row=1,column=3)
button=tk.Button(root,text="submit")
button.grid(row=1,column=4)
root.mainloop()
-编辑-
尝试过这种方法,但我认为这不是正确的方法.
Tried this way, but i don't think this is the correct way to do it.
import Tkinter as tk
root = tk.Tk()
def myfunction(event):
x=var.get()
y=entry1.get()
z=entry2.get()
print len(x),":",len(y),":",len(z)
if len(y)>0 and len(x)>0 and len(z)>0:
button.config(state='normal')
else:
button.config(state='disabled')
entry1=tk.Entry(root,width=15)
entry1.grid(row=1,column=1)
entry2=tk.Entry(root,width=15)
entry2.grid(row=1,column=2)
choices=('a','b','c')
var=tk.StringVar(root)
option=tk.OptionMenu(root,var,*choices)
option.grid(row=1,column=3)
button=tk.Button(root,text="submit")
button.grid(row=1,column=4)
root.bind("<Enter>", myfunction)
root.mainloop()
推荐答案
Tkinter变量具有一个名为trace
的方法来添加观察者,因此当值更改时将调用回调函数.我认为它比root.bind("<Enter>", myfunction)
更有效:
Tkinter variables have a method called trace
to add an observer, so the callback function is called when the value changes. I think it is much more efficient than root.bind("<Enter>", myfunction)
:
import Tkinter as tk
root = tk.Tk()
def myfunction(*args):
x = var.get()
y = stringvar1.get()
z = stringvar2.get()
if x and y and z:
button.config(state='normal')
else:
button.config(state='disabled')
stringvar1 = tk.StringVar(root)
stringvar2 = tk.StringVar(root)
var = tk.StringVar(root)
stringvar1.trace("w", myfunction)
stringvar2.trace("w", myfunction)
var.trace("w", myfunction)
entry1 = tk.Entry(root, width=15, textvariable=stringvar1)
entry1.grid(row=1,column=1)
entry2 = tk.Entry(root, width=15, textvariable=stringvar2)
entry2.grid(row=1,column=2)
choices = ('a','b','c')
option = tk.OptionMenu(root, var, *choices)
option.grid(row=1,column=3)
button = tk.Button(root,text="submit")
button.grid(row=1, column=4)
root.mainloop()
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