Graded Combobox Menü Python Tkinter

Question

Wie erstellt man eine graduierte Combobox in Python Tkinter? Wenn wir beispielsweise einen Wert aus dem ersten Combobox-Menü auswählen, zeigt das nächste Combobox-Menü nur Werte an, die innerhalb der ersten ausgewählten Combobox-Wertkategorie liegen.

Dies ist mein Code:

BU = StringVar() 
BU.set("") 

def BU(BU_choices): 
    s = BU.get() 

BU_choices = ["DUM", "IND", "KAM", "RAP"] 
BU_drop = OptionMenu(Canv, status, *BU_choices, command=BU) 
BU_drop.config(bg="white", fg="dark blue", width=3, relief=GROOVE) 
BU_drop.place(x=130, y=110) 

sector = StringVar() 
sector.set("") 

def sector(sector_choices): 
    s = sector.get() 

sector_choices == selected_sector   
if BU.get() == "DUM": 
    selected_sector = ["GRG", "LBO", "KBU", "PLS"] 
elif BU.get() == "IND": 
    selected_sector = ["BYS", "MER", "NGD", "PER"] 
sector_drop = OptionMenu(Canv, status, *sector_choices, command=sector) 
sector_drop.config(bg="white", fg="dark blue", width=3, relief=GROOVE) 
sector_drop.place(x=130, y=150) 

Alle vorschlagen?

Answer 1

Basierend auf Ihren Code mit einigen Bugs behoben: Ihr

def on_BU_change(BU_selected): 
    # remove current options in sector combobox 
    menu = sector_drop['menu'] 
    menu.delete(0, 'end') 
    # create new options for sector combobox based on selected value of BU combobox 
    if BU_selected == 'DUM': 
     selected_sectors = ['GRG', 'LBO', 'KBU', 'PLS'] 
    elif BU_selected == 'IND': 
     selected_sectors = ['BYS', 'MER', 'NGD', 'PER'] 
    else: 
     selected_sectors = [''] 
    # clear the current selection of sector combobox 
    sector.set('') 
    # setup the sector combobox 
    for item in selected_sectors: 
     menu.add_command(label=item, command=lambda x=item: on_sector_change(x)) 

BU = StringVar() 
BU_choices = ['DUM', 'IND', 'KAM', 'RAP'] 
BU_drop = OptionMenu(Canv, BU, *BU_choices, command=on_BU_change) 
BU_drop.config(bg='white', fg='dark blue', width=3, relief=GROOVE) 
BU_drop.place(x=130, y=110) 

def on_sector_change(sector_selected): 
    sector.set(sector_selected) 

sector = StringVar() 
sector_drop = OptionMenu(Canv, sector, '', command=on_sector_change) 
sector_drop.config(bg='white', fg='dark blue', width=3, relief=GROOVE) 
sector_drop.place(x=130, y=150)