Tkinter – GUI：用户文本输入，带有检查输入异常并关闭窗口的按钮。

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英文:

Tkinter - GUI: user text input with button that checks input for exceptions and closes window

问题

我正在创建一个GUI，该GUI将在文本字段中接受用户输入，然后在按下“输入数据”按钮后，程序将检查用户输入是否为数字（稍后在代码中再次使用输入）。我正在尝试使按钮仅在没有引发异常时关闭窗口（即两个文本字段都包含文本且为数字）。我应该在何处放置“window.destroy()”方法？

当前，无论如何程序都会关闭，并且只会输出异常警告。

  1. import tkinter
  2. from tkinter import *
  3. from tkinter import ttk
  4. from tkinter import messagebox
  6. def enter_data_close():
  7.     global user_input_1
  8.     global user_input_2
  10.     user_input_1 = user_input_1_entry.get()
  11.     user_input_2 = user_input_2_entry.get()
  13.     if user_input_1 and user_input_2:
  14.         try:
  15.             float(user_input_1)
  16.             user_input_1 = float(user_input_1)
  17.             if user_input_1 <= 0:
  18.                 tkinter.messagebox.showwarning(title="Value Error!", message="user_input_1 must be a positive number (>0). Please provide a different value!")
  19.         except ValueError:
  20.             tkinter.messagebox.showwarning(title="Value Error!", message="Please provide a numeric value for user_input_1!")
  22.         try:
  23.             float(user_input_2)
  24.             user_input_2 = float(user_input_2)
  25.             if user_input_2 <= 0:
  26.                 tkinter.messagebox.showwarning(title="Value Error!", message="user_input_2 must be a positive number (>0). Please provide a different value!")
  27.         except ValueError:
  28.             tkinter.messagebox.showwarning(title="Value Error!", message="Please provide a numeric value for user_input_2!")
  30.         window.destroy()
  32.     else:
  33.         tkinter.messagebox.showwarning(title="Error", message="Provide values for all entry boxes!")
  35. # GUI
  37. window = tkinter.Tk()
  38. window.title("Dimensions Data Entry")
  39. window.resizable(0, 0)
  41. frame = tkinter.Frame(window)
  42. frame.pack()
  44. def disable_event():
  45.     pass
  46. window.protocol("WM_DELETE_WINDOW", disable_event)
  48. # DIMENSIONS
  50. dimensions_frame = tkinter.LabelFrame(frame, text="Dimensions")
  51. dimensions_frame.grid(row=0, column=0, padx=20, pady=10)
  53. user_input_1_label = tkinter.Label(dimensions_frame, text="user_input_1:")
  54. user_input_1_label.grid(row=0, column=0)
  55. user_input_2_label = tkinter.Label(dimensions_frame, text="user_input_2:")
  56. user_input_2_label.grid(row=0, column=1)
  58. user_input_1_entry = tkinter.Entry(dimensions_frame)
  59. user_input_2_entry = tkinter.Entry(dimensions_frame)
  60. user_input_1_entry.grid(row=1, column=0)
  61. user_input_2_entry.grid(row=1, column=1)
  63. for widget in dimensions_frame.winfo_children():
  64.     widget.grid_configure(padx=10, pady=5)
  66. # ENTER DATA AND CLOSE BUTTON
  67. button = tkinter.Button(frame, text="Enter Data", command=enter_data_close)
  68. button.grid(row=3, column=0, sticky="news", padx=20, pady=10)
  70. window.mainloop()
英文:

I am creating a GUI that will accept user input in the text fields, and then after pressing the "Enter Data" button the program will check if the user input is a numeric (the input is later used later down the code). I am trying to make the button only close the window if no exception is raised (i.e. both text fields have text and it's numeric). Where should I place the "window.destroy()" method?

Right now the program closes no matter what, and just spits out the exception warnings.

  1. import tkinter
  2. from tkinter import *
  3. from tkinter import ttk
  4. from tkinter import messagebox
  5. def enter_data_close():
  6. global user_input_1
  7. global user_input_2
  8. user_input_1=user_input_1_entry.get()
  9. user_input_2=user_input_2_entry.get()
  10. if user_input_1 and user_input_2:
  11. try:
  12. float(user_input_1)
  13. user_input_1=float(user_input_1)
  14. if user_input_1&lt;=0:
  15. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;user_input_1 must be a positive number(&gt;0). Please provide a different value!&quot;)
  16. except ValueError:
  17. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;Please provide a numeric value for user_input_1!&quot;)
  18. try:
  19. float(user_input_2)
  20. user_input_2=float(user_input_2)
  21. if user_input_2&lt;=0:
  22. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;user_input_2 must be a positive number(&gt;0). Please provide a different value!&quot;)
  23. except ValueError:
  24. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;Please provide a numeric value for user_input_2!&quot;)
  25. window.destroy()
  26. else:
  27. tkinter.messagebox.showwarning(title=&quot;Error&quot;, message=&quot;Provide values for all entry boxes!&quot;)
  28. #GUI 
  29. window = tkinter.Tk()
  30. window.title(&quot;Dimensions Data Entry&quot;)
  31. window.resizable(0,0)
  32. frame = tkinter.Frame(window)
  33. frame.pack()
  34. def disable_event():
  35. pass
  36. window.protocol(&quot;WM_DELETE_WINDOW&quot;, disable_event)
  37. #DIMENSIONS
  38. dimensions_frame =tkinter.LabelFrame(frame, text=&quot;Dimensions&quot;)
  39. dimensions_frame.grid(row= 0, column=0, padx=20, pady=10)
  40. user_input_1_label = tkinter.Label(dimensions_frame, text=&quot;user_input_1:&quot;)
  41. user_input_1_label.grid(row=0, column=0)
  42. user_input_2_label = tkinter.Label(dimensions_frame, text=&quot;user_input_2:&quot;)
  43. user_input_2_label.grid(row=0, column=1)
  44. user_input_1_entry = tkinter.Entry(dimensions_frame)
  45. user_input_2_entry = tkinter.Entry(dimensions_frame)
  46. user_input_1_entry.grid(row=1, column=0)
  47. user_input_2_entry.grid(row=1, column=1)
  48. for widget in dimensions_frame.winfo_children():
  49. widget.grid_configure(padx=10, pady=5)
  50. # ENTER DATA AND CLOSE BUTTON
  51. button = tkinter.Button(frame, text=&quot;Enter Data&quot;, command=enter_data_close)
  52. button.grid(row=3, column=0, sticky=&quot;news&quot;, padx=20, pady=10)
  53. window.mainloop()

答案1

得分: 1

你已经非常接近了。只需在你的消息框代码末尾添加return。

  1. def enter_data_close():
  2.     global user_input_1
  3.     global user_input_2
  5.     user_input_1 = user_input_1_entry.get()
  6.     user_input_2 = user_input_2_entry.get()
  8.     if user_input_1 and user_input_2:
  9.         try:
  10.             float(user_input_1)
  11.             user_input_1 = float(user_input_1)
  12.             if user_input_1 <= 0:
  13.                 tkinter.messagebox.showwarning(title="数值错误！", message="user_input_1 必须是正数（>0）。请提供不同的值！")
  14.                 return
  15.         except ValueError:
  16.             tkinter.messagebox.showwarning(title="数值错误！", message="请为 user_input_1 提供数值！")
  17.             return
  19.         try:
  20.             float(user_input_2)
  21.             user_input_2 = float(user_input_2)
  22.             if user_input_2 <= 0:
  23.                 tkinter.messagebox.showwarning(title="数值错误！", message="user_input_2 必须是正数（>0）。请提供不同的值！")
  24.                 return
  25.         except ValueError:
  26.             tkinter.messagebox.showwarning(title="数值错误！", message="请为 user_input_2 提供数值！")
  27.             return
  29.         window.destroy()
  31.     else:
  32.         tkinter.messagebox.showwarning(title="错误", message="为所有输入框提供值！")
  33.         return
英文:

You're really close. Just add return to the end of your messageboxes.

  1. def enter_data_close():
  2. global user_input_1
  3. global user_input_2
  4. user_input_1=user_input_1_entry.get()
  5. user_input_2=user_input_2_entry.get()
  6. if user_input_1 and user_input_2:
  7. try:
  8. float(user_input_1)
  9. user_input_1=float(user_input_1)
  10. if user_input_1&lt;=0:
  11. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;user_input_1 must be a positive number(&gt;0). Please provide a different value!&quot;)
  12. return
  13. except ValueError:
  14. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;Please provide a numeric value for user_input_1!&quot;)
  15. return
  16. try:
  17. float(user_input_2)
  18. user_input_2=float(user_input_2)
  19. if user_input_2&lt;=0:
  20. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;user_input_2 must be a positive number(&gt;0). Please provide a different value!&quot;)
  21. return
  22. except ValueError:
  23. tkinter.messagebox.showwarning(title=&quot;Value Error!&quot;, message=&quot;Please provide a numeric value for user_input_2!&quot;)
  24. return
  25. window.destroy()
  26. else:
  27. tkinter.messagebox.showwarning(title=&quot;Error&quot;, message=&quot;Provide values for all entry boxes!&quot;)
  28. return

huangapple
  • 本文由 发表于 2023年8月4日 02:03:58
  • 转载请务必保留本文链接：https://go.coder-hub.com/76830607.html
  • exception
  • python
  • tkinter
  • tkinter-button
  • tkinter-entry
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