Python tkinter禁用"submit“按钮，直到填充完所有字段

Question

我还是Python的新手，但我正在制作一个GUI应用程序，它有两个输入字段和两个文件对话框按钮，供用户选择要导入的文件和保存程序输出的目录。我正在尝试对输入字段进行一些验证，以确保用户在填写输入字段并选择要导入的文件和保存输出的目录之前，无法单击submit按钮。

我得到了一些方法，但我卡住了，我担心我对类和方法的了解不够，无法确定为什么我不能更改我的submit_button.config的状态？

我已经阅读了如何对输入字段进行验证的各种示例，包括使用validatecommand和在我的类中构建验证方法。我放弃了它，因为我不知道如何在submit_button命令中验证多个字段。

这是我现在的代码。我正在努力使用Application类中的validate方法。

import pandas as pd
import numpy as np
from tkinter import *
from tkinter import ttk
from tkinter import filedialog as fd
from tkinter import messagebox
import os

class FileLogic:

    def __init__(self, path, save_location, request_id, exeuction_id):
        self.path = path
        self.save_location = save_location
        self.request_id = request_id
        self.execution_id = execution_id

    def fileopen(self=None):
        global fileName
        global path
        path = fd.askopenfilename(title = "Select File", filetypes=( ("Excel files", "*.xlsx"),("All files", "*.*") ) )
        fileName = os.path.split(path)[1]

        if not fileName:
            messagebox.showerror("ERROR - File Not Selected", "A file was not selected to process.  Please select a file by double-clicking or select file and press Open button")
        else:
            file_select_label = Label(root, text=("File Selected: " + fileName), width=75, bg="light blue")
            file_select_label.grid(row=7, columnspan=2)

        return path

    def filesave(self=None):
        global save_location
        save_location = fd.askdirectory(title = "Select Directory")

        if not save_location:
            messagebox.showerror("ERROR - Directory Not Selected", "This upload process will build an output file.  Please select a folder where the output file can be saved")
        else:
            file_select_label = Label(root, text=("Output file will be saved: " + save_location), width=75, bg="light blue")
            file_select_label.grid(row=8, columnspan=2)

        return save_location

    def submit(self, path, save_location, request_id, execution_id):

        print("FileLogic path: " + self.path)
        print("FileLogic save: " + self.save_location)
        print("FileLogic request: " + self.request_id)
        print("FileLogic execution: " + self.execution_id)
#        FileParsing.__init__(request_id)

class FileParsing:

    def __init__(self, request_id):
        self.request_id = request_id
#        self.execution_id_entry = execution_id_entry
        print("request id2: " + request_id)

class Application(Frame):

    def __init__(self, master):
        ttk.Frame.__init__(self, master)

        self.grid()
        self.create_widgets()


    def create_widgets(self):
        global submit_button
        ##### Define the Labels ###############
        self.request_id_label = Label(root, text="Enter Rebate Request Id:", bg="light blue", bd=2, width=25).grid(row=0, column=0)
        self.execution_id_label = Label(root, text="Enter Rebate Execution Id:", bg="light blue", bd=2, width=25).grid(row=1, column=0)
        self.blank_label = Label(root, bg="light blue")
        ####### Define the Entry fields ##################


        self.request_id_entry = Entry(root,bg="light gray", bd=2, width=25, textvariable=request_id_entry).grid(row=0, column=1)
        self.execution_id_entry = Entry(root, bg="light gray", bd=2, width=25, textvariable=execution_id_entry).grid(row=1, column=1)

        ###### Define the Buttons ###############
        self.submit_button = Button(root, text="Submit", bg="gray", width=17, command= lambda: self.submit_click(path, save_location, request_id, execution_id))
        self.submit_button.config(state='disabled')

        self.open_file_button = Button(root, text="Select file to process", width = 30, command=FileLogic.fileopen).grid(row=3, column=0)
        self.save_location_button = Button(root, text="Select location to save output", width=30, command=FileLogic.filesave).grid(row=4, column=0)

        ##### Build the Grid ##################
        self.blank_label.grid(row=2, column=0)
        self.blank_label.grid(row=5, columnspan=2)
        self.submit_button.grid(row=6, column=1)

    def validate(self, *args):
        print("validate")
        button_status = self.create_widgets(submit_button)

        if request_id_entry.get():
            print("normal")
            print(button_status)
#            self.submit_button.config(state='normal')
        else:
            print("diabled")
            print(submit_button.config)
#            self.submit_button.config(state='disabled')

    def num_check(self,var):
        var = self.var.get()
        print(var)
        if var.isnumeric():
            return True
        else:
            tkinter.messagebox.showinfo("Error", "Enter Numeric Value")

    def submit_click(self, path, save_location, request_id, execution_id):
        self.request_id = request_id_entry.get()
        self.execution_id = execution_id_entry.get()

        a = FileLogic(path, save_location, request_id, execution_id)
        FileLogic.submit(a, path, save_location, request_id, execution_id)


root=Tk()

root.title("Rebate Bid Data Upload")
root.geometry("500x200")
root.configure(background="light blue")
request_id_entry = StringVar()
execution_id_entry = StringVar()

request_id_entry.trace("w", Application.validate)

app = Application(root)
root.mainloop()

在完成所有的entry元素和filedialog属性之前，我正在尝试获取submit按钮被禁用的位置。然后，对于输入字段，我将检查以确保它们是数字，并且我将希望确保它们是整数。

Answer 1

您没有正确使用textvariable。还要注意，通过在同一行上定义entry小部件并调用grid方法，您并没有保留这些小部件的引用。

def create_widgets(self):
    #global submit_button #you don't have to declare global here: submit_button is already an attribute

    ...

    self.request_var = StringVar() #create StringVars for request
    self.execution_var = StringVar() #ditto for execution
    self.request_id_entry = Entry(root,bg="light gray", bd=2, width=25,textvariable=self.request_var).grid(row=0, column=1) #set the textvariable to the StringVar
    self.execution_id_entry = Entry(root, bg="light gray", bd=2, width=25,textvariable=self.execution_var).grid(row=1, column=1)
    self.request_var.trace("w",self.validate) #trace changes on StringVar
    self.execution_var.trace("w",self.validate)

    ...

def validate(self, *args):
    if self.request_var.get() and self.execution_var.get(): #if both StringVars has content
        print("normal")
        self.submit_button.config(state='normal')
    else:
        print("disabled")
        self.submit_button.config(state='disabled')