[英]how to get input from a tkinter text widget when its inside a function
relatively new to coding and currently I am playing with tkinter in python, I am using a text widget within a function and want to send the input from the text box to another function. 我的全局变量在模块级别表示未定义,所以如果它在 function 内,我怎么能在模块级别定义它?
当我按下发送 email 按钮时,我收到此错误消息“NameError: name 'user_message_entry' is not defined”
有什么建议么? 非常感谢!
最小复制:
import tkinter as tk
root = tk.Tk()
root.geometry("500x500")
def send_email():
global user_message_entry
subject = ":)"
body = user_message_entry.get("1.0", "end")
message = f"subject: {subject}\n\n {body}"
print(message)
def feedback():
feedback_window = tk.Toplevel()
feedback_window.geometry("690x650")
message_frame = tk.Frame(feedback_window)
message_frame.grid(row=0, column=0, columnspan=3)
user_message_entry = tk.Text(message_frame, height=10, width=60)
user_message_entry.grid(row=0, column=0)
send_email_button = tk.Button(feedback_window, command=send_email,
height=20, width=20, bg="yellow", text="send email")
send_email_button.grid(row=1, column=0)
open_feedback_button = tk.Button(root, command=feedback, height=20, width=20, bg="yellow", text="open feedback window")
open_feedback_button.grid(row=1, column=0)
root.mainloop()
您可以使用 Object 定向方法来使访问更简单,另一个选项也可以使用 globals() 来使变量全局化
单程
globals()['user_message_entry'] = tk.Text(message_frame, height=10, width=60)
....
从另一个 function 你可以打电话
body = globals()['user_message_entry'].get("1.0", "end")
第二种方式
面向 Object 的编程适用于各种类型的问题解决,因此您也可以使用 class
import tkinter as tk
class CBased:
def __init__(self, master, *args, **kwargs):
super(CBased, self).__init__(*args, *kwargs)
self.master = master
master.geometry("500x500")
self.open_feedback_button = tk.Button(master, command=self.feedback, height=20, width=20, bg="yellow", text="open feedback window")
self.open_feedback_button.grid(row=1, column=0)
def send_email(self):
subject = ":)"
body = self.user_message_entry.get("1.0", "end")
message = f"subject: {subject}\n\n {body}"
print(message)
def feedback(self):
self.feedback_window = tk.Toplevel()
self.feedback_window.geometry("690x650")
self.message_frame = tk.Frame(self.feedback_window)
self.message_frame.grid(row=0, column=0, columnspan=3)
self.user_message_entry = tk.Text(self.message_frame, height=10, width=60)
self.user_message_entry.grid(row=0, column=0)
self.send_email_button = tk.Button(self.feedback_window, command=send_email,
height=20, width=20, bg="yellow", text="send email")
self.send_email_button.grid(row=1, column=0)
def main():
root = Tk()
myobj = CBased(root)
root.mainloop()
if __name__ == "__main__":main()
这样,您可以通过 self.xyz 调用每个项目
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