tkinter 提交按钮句柄功能只有一次，除非给出不同的输入

Question

我是tkinter的新手，这是一种简单的方法，但我不知道该怎么做。我想创建一个提交按钮，如果给出相同的用户输入并再次提交，该按钮将禁用，但如果给出新输入，它将执行其功能。有人可以帮助我吗？谢谢

Answer 1

如果我理解问题 - 您必须创建列表以记住提交的数据并使用新输入进行检查

import tkinter as tk
# --- functions ---
def submit():
    data = e.get()
    if data in already_submitted:
        print('Sorry already submitted:', data)
    else:    
        print('Submit:', data)
        already_submitted.append(data)
# --- main ---
# don't submit empty string        
already_submitted = ['']
root = tk.Tk()
e = tk.Entry(root)
e.pack()
b = tk.Button(root, text="Submit", command=submit)
b.pack()
root.mainloop()

---

顺便说一句：您还可以bind()功能在每次key后Entry和检查输入并禁用/启用按钮。

import tkinter as tk
# --- functions ---
def submit():
    data = e.get()
    if data in already_submitted:
        print('Sorry already submitted:', data)
    else:    
        print('Submit:', data)
        already_submitted.append(data)
        b['state'] = 'disable'
def check(event):
    #data = event.widget.get()
    data = e.get()
    if data in already_submitted:
        b['state'] = 'disable'
    else:
        b['state'] = 'normal'
# --- main ---
# don't submit empty string        
already_submitted = ['']
root = tk.Tk()
e = tk.Entry(root)
e.pack()
e.bind('<KeyRelease>', check)
b = tk.Button(root, text="Submit", command=submit, state='disable')
b.pack()
root.mainloop()