tkinter grid_forget 方法

Question

The program I am creating updates the page with new data once the submit button is clicked, in the function for the submit button, it creates the labels (8 of them).

row = 7
step = 0

for k,v in ordnance_database.items():
    name = v
    label = Label(window, text=(name + ": " + str(ship_ordnance[step])),
                  background=background_colour, foreground="white", font="none 10")
    label.grid(row=row, column=0, sticky=W, columnspan=2)

    all_labels.append(label)
    row += 1
    step += 1

When the submit button is clicked again, it creates new labels but the previous ones are still there. After a bit of googling and searching in the reference I found this: How to remove widgets from grid in tkinter? and added this in the submit button's function:

for labels in window.grid_slaves():
    if 7 < int(labels.grid_info()["row"]) < 15 and int(labels.grid_info()["column"]) == 0:
        labels.grid_forget()
    else:
        pass

I would like to clear the contents of the grids with row values 7 to 14, and in column 0.

I have tried adding window.update() but this made no difference.

I have confirmed that to labels.grid_forget() is being triggered using print() but it's not actually clearing them from the screen.

I have also tried using .configure - something like this

labels.configure(text="Loading")

but no joy.

Here are screenshots from the program showing the issue. On the second button click you can see "Homing: 8" has the previous data hidden behind it.

Answer 1

The grid_forget() method will just hide the label, it won't remove the label.

If you want to remove the label, use destroy() . Now, if the objective here is just to update the label text, you can use StringVar()

row = 7
step = 0
for k,v in ordnance_database.items():
    name = v
    lbl_text_var = StringVar()
    lbl_text_var.set(name + ": " + str(ship_ordnance[step]))
    label = Label(window, textvariable=lbl_text_var, background=background_colour, foreground="white", font="none 10")
    # Setting text variable as it's own attribute to retrieve it later.
    # a separate list can also be created
    label.lbl_text_var = lbl_text_var
    all_labels.append(label)
    row += 1
    step += 1

now when you want to set the values

step = 0
for k,v in ordnance_database.items():
    name = v
    lbl_text_var = all_labels[step].lbl_text_var
    lbl_text_var.set(name + ": " + str(ship_ordnance[step]))
    step += 1