CODEWITHSUNDEEP
pythontkinterautocomplete
Ste1Drag
Ste1Drag

Reputation: 59

How to fix StringVar.get() issue

I am trying to make autocomplete GUI (like Google's) in Tkinter using StringVar. I defined a callback function , where i used StringVar.get(), where I for different input in Entry I get different output via autocomplete suggestions in ListBox. The problem is that after typing one letter in Entry I get right output but after typing 2 or more I get empty ListBox. Here's the code.

num=input()
num=int(num)
sv=StringVar()
def callback(sv,list,num):
    a=sv.get()
    pom_list = list
    bin_list = []
    lexicographic_sort(pom_list)
    x = binary_search(a, pom_list)
    while x != -1:
        bin_list.append(x)
        pom_list.remove(x)
        x = binary_search(a, pom_list)

    i = 0
    l = Listbox(root, width=70)
    l.grid(row=2, column=5)
    if len(bin_list) == 0 or len(a) == 0:
        l.delete(0, END)

    else:
        for list1 in bin_list:
            if i == num:
                break
            l.insert(END, list1[0])
            i += 1
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv,list,num))
te = Entry(root, textvariable=sv)
te.grid(row=1,column=5)

where list outside callback function is a list of all suggestions, and bin_list is a list of suggestions of StringVar.get() using binary_search.

Upvotes: 1

Views: 106

Answers (1)

acw1668
acw1668

Reputation: 46669

It is because all matched items for the first letter have been removed from the search list. You should use a cloned search list in callback(). Also don't create new list to show the result list, create the result list once and update its content in callback(). Furthermore, sort the search list beforehand:

def callback(sv, wordlist, num):
    result.delete(0, END) # remove previous result
    a = sv.get().strip()
    if a:
        pom_list = wordlist[:]  # copy of search list
        #lexicographic_sort(pom_list)  # should sort the list beforehand
        x = binary_search(a, pom_list)
        while x != -1 and num > 0:
            result.insert(END, x)
            pom_list.remove(x)
            num -= 1
            x = binary_search(a, pom_list)

...

lexicographic_sort(wordlist)
sv = StringVar()
sv.trace("w", lambda *args, sv=sv: callback(sv, wordlist, num))

...

result = Listbox(root, width=70)
result.grid(row=2, column=5)

Upvotes: 2

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