Automatically scroll down Listbox in Tkinter app

Question

Hi guys I'm making this chat app with tkinter and it works perfectly except by the fact that the text I post in my Listbox, don't shows up the way I want. Once the space in the Listbox finishes, I have to manually scroll down to see recent messages. My question is, what can I do to make the Listbox automatically scroll down when it gets fill. This is the part of the code of the Listbox lista=Listbox(raiz,font=('Arial')) lista.pack(side=LEFT,padx=10,pady=10,ipadx=200,fill=X,expand=True )

And this is where I posted:

def post(text,n=0):
   winsound.Beep(400,150)
   if n==0:
      lista.insert(END,text)
      campo.delete(0,1000)  
   else:
      for i in text:
          lista.insert(END,i)

If you can help me it will be great. Thanks!!!

i think the you should clear the Listbox and display the current one. — AD WAN
– AD WAN, Commented Feb 19, 2018 at 15:46
The listbox has a see method to scroll a particular item into view. — Bryan Oakley
– Bryan Oakley, Commented Feb 19, 2018 at 19:47
Please rename your title that emphasizes the specific issue you're having. Right now the title leads to nowhere. — Nae
– Nae, Commented Feb 19, 2018 at 21:09
@Bryan Oakley you should put your comment in an answer to mark it as correct because that was the method i used, and it works perfectly — amh9412
– amh9412, Commented Mar 21, 2018 at 19:51

Ricardo Prieto · Accepted Answer · 2019-03-28 15:53:32Z

3

You need add this line lista.see(tkinter.END) before lista.insert(END,text)

answered Mar 28, 2019 at 15:53

Ricardo Prieto

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Comments

AD WAN · Accepted Answer · 2018-02-19 16:00:06Z

1

You should clear the Listbox widget before you display the current or insert

def post(text,n=0):
   winsound.Beep(400,150)
   if n==0:
      lista.delete(0, END) # this to clear the listbox and display the current content in the listbox
      lista.insert(END,text)
      campo.delete(0,1000)  
   else:
      for i in text:
          lista.insert(END,i)

Or you can place the new content at top of Listbox like this,

def post(text,n=0):
   winsound.Beep(400,150)
   if n==0:
      return
      lista.insert(n-1, text)
      campo.delete(0,1000)  
   else:
      for i in text:
          lista.insert(END,i)

Since you didn't post your full code or minimal am assuming this how it is.

answered Feb 19, 2018 at 16:00

AD WAN

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4 Comments

amh9412 Over a year ago

This way I can't see a history of received messages or will I?

amh9412 Over a year ago

A comment, n, is just a marker if its value is 0 it means that the action triggering the function is a Button or a press key defined with bind(), if it is 1 it means that the action triggering the function is an incoming socket messages

AD WAN Over a year ago

i don't know what code you have at your end, create minimal code so you can get help.With this you are giving me burden .

amh9412 Over a year ago

I find a way to automatically scroll down the Listbox always a text is posted. The way I do it is with lista.see(END), this way always a text is inserted with lista.insert(END,text), the listbox automatically will show the END that is where the new text is.

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