get porper listbox item when using trace-CodePudding

...
import tkinter
from tkinter import StringVar


adfl = ['Alan Alexander Milne', 'Alice Hoffman', 'Alicia Bay Laurel', 'Alison Weir',       'Alistair Cooke','Alycea Ungaro', 'Amanda Quick', 'Ann Durell', 'Anne De Courcy', 'Anne Kent Rush', 'Anne McCaffrey','Anne Purdy', 'Anne Rice', 'Anon', 'Antoine de Saint-Exupery', 'Anya Seton', 'Arthur Conan Doyle','Ashida Kim', 'Aubrey Beardsley', 'BBC', 'Barbara Ann Brennan', 'Barbara Walker', 'Bertrice Small','Betsy Bruce', 'C. S. Lewis', 'Caitlin Matthews', 'Carl Sagan', 'Carol Belanger Grafton', 'Carol Blackman','Carol Kisner', 'Caroline Foley', 'Carolyn Kisner', 'Catherine Coulter', 'Charles Greenstreet Addison','Charlotte Bronte', 'Chic Tabatha Cicero', 'Christina Dodd', 'Christopher Paolini', 'Clare Maxwell-Hudson','Clarissa Pinkola Estés', 'Co Spinhoven', 'D. J. Conway', 'D.H. Lawrence', 'Dan Brown','Daniel M. Mendelowitz', 'Deborah E. Harkness', 'Denise Dumars', 'Denys Hay', 'Diana Gabaldon','Diana L. Paxson', 'Dinah Lovett', 'Dion Fortune', 'Donald M. Anderson']


def update_list(*args):
    frame1_lb.delete(0, 'end')
    search_term = ent_var.get()
    for item in adfl:
        if search_term.lower() in item.lower():
            frame1_lb.insert('end', item)
    return


def author_list():
    # Clear entry box
    ent_var.set("")
    frame1.configure(text='Author')
    frame1_list.set(adfl)
    # Set up trace for list update, only need this one instance to make work
    ent_var.trace("w", update_list)
    frame1_lb.bind('<<ListboxSelect>>', sauthor_list)


def sauthor_list(self):
    caut = frame1_lb.curselection()
    print(caut)
    saut = adfl[caut[0]]
    print(saut)


##########
window = tkinter.Tk()
window.geometry("600x900")
window.resizable(width=False, height=False)
window.wm_title("My Book Library")
window.configure(bg='#5e84d4')
window.update_idletasks()
# Gets the requested values of the height and widht.
windowWidth = window.winfo_width()
windowHeight = window.winfo_height()
# Gets both half the screen width/height and window width/height
positionRight = int((window.winfo_screenwidth() / 2) - windowWidth / 2)
positionDown = int((window.winfo_screenheight() / 2) - windowHeight / 2)
# Positions the window in the center of the page.
window.geometry(" {} {}".format(positionRight, positionDown))
# Layout of frames

frame1 = tkinter.LabelFrame(window, text='', bg='lightblue')
frame1.place(relx=0.010, rely=0.10, relheight=0.890, relwidth=0.500)
frame1.configure(relief='groove')
frame1.configure(borderwidth="2")
frame1_list = StringVar()
frame1_lb = tkinter.Listbox(frame1, listvariable=frame1_list, width=40, height=44)
frame1_lb.place(x=0.0, y=0.30)
frame1_sb = tkinter.Scrollbar(frame1, orient=tkinter.VERTICAL)
frame1_lb.config(yscrollcommand=frame1_sb.set, bg='white')
frame1_sb.pack(side=tkinter.RIGHT, fill=tkinter.Y)
frame1_sb.config(command=frame1_lb.yview)

frame1a = tkinter.LabelFrame(window, text="Enter letters  - for search")
frame1a.configure(border=2, relief='groove')
frame1a.place(relx=0.010, rely=0.05, relheight=0.05, relwidth=0.500)
ent_var = StringVar()
frame1_ent = tkinter.Entry(frame1a, textvariable=ent_var,  width=40, bg='white')
frame1_ent.place(x=0.0, rely=0.0)
search_term = ent_var.get()


author_list()
window.mainloop()
...

So, I can use the trace to get list shortened to what I want by entering into entry box. But when I click on shortened list I get the value of the position in previous list, not the new shorten list value. Works okay without using entry box, to shorten list. This was my attempt at a autocomplete listbox type.

CodePudding user response：

You use the wrong source for showing the selected item. As the shortened list is not the same as adfl, you should not use adfl inside sauthor_list(). You need to get the selected item using frame1_lb.get() instead:

def sauthor_list(self):
    caut = frame1_lb.curselection()
    print(caut)
    saut = frame1_lb.get(caut[0])  # get the selected item
    print(saut)