python - 在文本输入框上使用验证

Question

我正在尝试在文本输入框上设置验证。其中三个框只需要接受整数和一个文本作为邮政编码。我不确定是在先前定义的函数中还是在创建输入框时执行此操作。另外，我将如何使文本输入框中的值在函数 QuoteCreation 中可访问。我所有的代码都在下面。

     from tkinter import *


class quote():  
 def __init__(self, master):

    self.master=master

    self.master.title("Quote Screen")
    self.master.geometry("2100x1400")

    self.master.configure(background = "white")
    self.Borras = PhotoImage(file = "Borras.Logo.2.gif") #sets up image
    self.Borras.image = self.Borras
    self.BorrasLabel = Label(self.master, image = self.Borras, bg = "white")#puts image onto label
    self.BorrasLabel.place(anchor=NW)

    self.Title = Label(self.master, text = "New Quote", font = ("calibri", 20), bg = "White")
    self.Title.place(x=650, y = 10)

    self.SubmitButton = PhotoImage(file = "Submit.Button.gif") #sets up image
    self.SubmitButton.image = self.SubmitButton
    self.SubmitButtonLabel = Button(self.master, image = self.SubmitButton, bg = "white", command= self.QuoteCreation)#puts image onto a button
    self.SubmitButtonLabel.place(x=900, y=290)




    PostCodeVar = StringVar() 
    PostCodeEntry = Entry(master,width=50, font=20, textvariable=PostCodeVar)
    PostCodeEntry.place(x = 20, y = 150)
    PostCodeVar.set("Please enter the Post Code")
    PostCodeValue = PostCodeVar.get()

    HeightVar = StringVar() 
    HeightEntry = Entry(master, width=50, font=20, textvariable=HeightVar)
    HeightEntry.place(x = 20, y = 220)
    HeightVar.set("Please enter the Height") 
    HeightValue = HeightVar.get() 

    LengthVar = StringVar()
    LengthEntry = Entry(master, width=50, font=20, textvariable=LengthVar)
    LengthEntry.place(x = 20, y = 290)
    LengthVar.set("Please enter the Length")
    LengthValue = LengthVar.get() 

    PitchVar = StringVar() 
    PitchEntry = Entry(master, width=50, font=20, textvariable=PitchVar)
    PitchEntry.place(x = 20, y = 360)
    PitchVar.set("Please enter the Pitch") 
    PitchValue = PitchVar.get() 

    RiseVar = StringVar() 
    RiseEntry = Entry(master, width=50, font=20, textvariable=RiseVar)
    RiseEntry.place(x = 20, y = 430)
    RiseVar.set("Please enter the Rise") 
    RiseValue = RiseVar.get() 

    self.SubmitButton = PhotoImage(file = "Submit.Button.gif") 
    self.SubmitButton.image = self.SubmitButton
    self.SubmitButtonLabel = Button(self.master, image = self.SubmitButton, bg = "white", command= self.QuoteCreation)#puts image onto a button
    self.SubmitButtonLabel.place(x=900, y=290)




def on_button(self):
    print(self.entry.get())

def QuoteCreation(self):
    print(' ')

def quitWindow(self):
    self.master.destroy()  

def backToWelcome(self):
    self.master.destroy() 

Answer 1

当按下提交按钮时，您可以设置单独的函数来处理验证。

因此，举个例子，您的提交按钮可能看起来像这样:

submitButton = Button(master, text="Submit", command=validation)

在您的情况下，验证将要执行这些检查:

def validation():
    postcode = PostCodeVar.get()
    length = LengthVar.get()
    pitch = PitchVar.get()
    rise = RiseVar.get()

    if postcodeCheck(postcode) == True and length.isdigit() == True and pitch.isdigit() == True and rise.isdigit() == True:
        #carry out chosen process

在您的情况下，您可以尝试在调用函数之前设置邮政编码、长度、间距和高度变量，并将它们设置为全局变量。应该创建邮政编码，如果没问题，函数应该:

return True

...所以它匹配 if 语句的结果。

我希望这就是您要找的，并且可以根据您的具体问题调整示例!