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I created a main root with two frames.

-One frame is for program toolbar.

-Other frame is for canvas where data will be displayed and a scrollbar widget.

-Inside of the canvas is a third smaller frame which will be used for scrolling trough data.

However, when I try to define new widgets and place them on that third smaller frame, nothing happens. I'm defining new widgets inside of a function call of a button command. I have also tried declaring everything as global variables but without luck.

Hint: I tried placing the code from the function to the top level of the code and it works. Also, if I try to mount these widgets on the toolbar frame it also works. It seems that the only thing I can't do is to mount these new widgets on the small frame that is inside the canvas.

I used a simple for loop to create labels just for testing.

Could anyone tell what I am doing wrong?

from tkinter import *
from tkinter import ttk



#Creating main window
root = Tk()
root.resizable(width=False, height=False)



#Defining Background

toolbar = Frame(root, width=613, height=114)
toolbar.grid(row=0, column=0)

background_frame = Frame(root, width=615, height=560)
background_frame.grid(row=1, column=0)

background = Canvas(background_frame, width=615, height=560)
background.pack(side=LEFT, fill=BOTH, expand=1)

scroll_bar = ttk.Scrollbar(background_frame, orient=VERTICAL, command=background.yview)
scroll_bar.pack(side=RIGHT, fill=Y)

background.configure(yscrollcommand=scroll_bar.set)
background.bind('<Configure>', lambda e:background.configure(scrollregion = background.bbox('all')))

second_frame = Frame(background)
background.create_window(150,100, window=second_frame, anchor='nw')


def confirm1():
    
    
    for x in range(100): 
        Label(second_frame, text = x ).grid(row=x, column=1)




show_labels = Button(toolbar, text= "Show labels", fg="black", command=confirm1)
show_labels.grid(row=0, column=2)

root.mainloop()

Picture of the app so far

Rastko Gojgic
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  • Possible duplicate of [Why does Tkinter image not show up if created in a function?](https://stackoverflow.com/questions/16424091/why-does-tkinter-image-not-show-up-if-created-in-a-function) – martineau Jun 20 '21 at 10:16
  • The link you provided is about the photos. I don't have a problem with that. Background image shows up fine. For some reason I' can't add labels or buttons to that frame when they are defined within a func. Also the scroll bar is not working. Maybe It's because I'm using a lambda func at one point?? Now I'm just guessing... – Rastko Gojgic Jun 20 '21 at 10:26
  • Please provide a runnable [mre]. That means take out everything unrelated to the problem. – martineau Jun 20 '21 at 10:29
  • I think I have provided the minimal reproducible code. Thank you for your time. Click on the button "By store" – Rastko Gojgic Jun 20 '21 at 10:39
  • Does having an `iconbitmap` have anything to with the problem, as well as the eight image files? I think not. – martineau Jun 20 '21 at 11:40
  • Sorry, I see what you mean. I believe I have now removed everything that was redundant. Now when I press the button all the labels show on the background, but the scroll button is not working. – Rastko Gojgic Jun 20 '21 at 12:45
  • That's an improvement codewise (it's runnable), however I think it's changed so much that you also need to update the text describing what it is you want to know. – martineau Jun 20 '21 at 13:17
  • Thank you for your guidance. I have now changed the question as well. Maybe you can help me now. – Rastko Gojgic Jun 20 '21 at 14:00

1 Answers1

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I surely can't reproduce the issue with your current code, but looking at the previous edit it is pretty clear what your problem is.

(taken from your previous edit)

def confirm1():
    
    global background_image1

    background.delete('all')  # <--- this line of code
 
    for x in range(100): 
        Label(second_frame, text = x ).grid(row=x, column=1)

Here you delete all your items from your canvas:

background.delete('all')

hence no item appears.

You should instead delete only those items that you want to remove by passing the id or tags to delete method. You can delete multiple items together at once by giving the same tags.

Another option would be to recreate the frame item again on canvas using create_window (Do note: your frame is not deleted/destroyed, it's only removed from canvas)

Art
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