如何在 Tkinter 中添加占位符

2022-01-09 00:00:00 python tkinter onclick

问题描述

如何将占位符添加到 tkinter 中的条目?例如，我不相信它具有像 HTML 这样的占位符功能.我发现要使文本在单击时消失，您必须添加一个 onclick 事件，但是如何创建 onclick 事件以及如何制作文字出现在第一位?这是我正在使用的代码.

How would I add a placeholder to an entry in tkinter? I don't believe it has a placeholder function like HTML for example. I figured out that to make the text disappear when you click it, you will have to add an onclick event, but how do I create the onclick event and how do you make the text appear in the first place? Here is the code I'm working with.

我想说"在此处输入您的整数"

I would like it to say " Enter your integer here"

    vcmd = (self.register(self.onValidate), '%S')
    self.text = Entry(self, validate='key', vcmd=vcmd)
    self.text.pack()
       
def onValidate(self, S):
    if S in '0123456789.':
        return True
    return False

def clear_entry(self):
    self.text.delete(0, END)
    self.text.pack()

解决方案

据我所知，你不能像 HTML 一样添加占位符，但你可以做出类似的行为.当您进入时，您可以执行以下操作>

U can't add placeholder like HTML as far as i know, but u can make similar behavior. When you make entry you can do something like>

from tkinter import *   

def clear_entry(event, entry):
    entry.delete(0, END)

root = Tk()

entry = Entry(root)

entry.pack()
placeholder_text = 'some text'
entry.insert(0, placeholder_text)

entry.bind("<Button-1>", lambda event: clear_entry(event, entry))

root.mainloop()

P.S:这是我自己写的，还没有测试过

P.S: I've wrote this from my head , haven't tested it

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