update a combobox tkinter-CodePudding

I am trying to make an application that changes the content of a combo box if the corresponding text file (which determines the value variable) is changed I already have this code in place but it is only updating after a program restart.

#image browser

def mod_dir_browser():
    old_moddir = oldmoddirfile
    filepath = filedialog.askdirectory(initialdir=old_moddir, title="select a new mod directory" )
    with open("mod.txt", "w", encoding="utf-8") as file:
        file.write(filepath)


#elements of the first window


button1 = Button(window, text="Change mod directory", command=lambda: [mod_dir_browser()])
button1.place(x=0, y=575)


label1 = Label(window, text='Select the game you want to install a mod to', fg = "#ffffff", bg ="#31363B" )
label1.place(x=200, y=50)

cmb1= ttk.Combobox(window,value=oldmoddirfile,width=50)
cmb1.place(x=160,y=150)

thanks for your help and time

CodePudding user response：

An alternative to the suggestion in the comments would be to get the value directly from the combobox instead of assigning it a variable.

Then you can make the mod_dir_browser function into

def mod_dir_browser():
    filepath = filedialog.askdirectory(initialdir=cmb1.get(), title="select a new mod directory" )
    cmb1.set(filepath)
    with open("mod.txt", "w", encoding="utf-8") as file:
        file.write(filepath)

You still would need to initialize your combobox value, but it is unclear what that is intended to be. However, that would be done as

cmb1= ttk.Combobox(window,value=oldmoddirfile,width=50)
cmb1.set('desiredvalue')