How can i get input text from an entrybox in Tkinter?

Question

So i am trying to get an text input for my program but tkinter doesn't seem to register it, and i don't know what i have done wrong

    window = self.newWindow(value)

    label = tk.Label(window, text="Intfix to Postfix Convert")
    label.place(x=0, y=20)

    e1 = tk.Entry(window)
    text = e1.get()
    e1.place(x=0, y=50)

    rezultat = tk.Text(window, width=20, height=3)
    rezultat.place(x=0, y=80)

    button = tk.Button(window, text="Enter")
    button.place(x=127, y=46)
    button.bind("<Double-Button-1>", self.passValue(rezultat, text))

My code looks something like this. Everything else is working the self.newWindow(value) is just a function that creates a new window from the main one

so i said text=e1.get() but i ran the debbuger and it says it is an empty string and i want to pass this text through the function passValue()(a function that passes the value to the controller), i used button.bind() to do that. Is that ok?

I tested it by putting a default value at text like text="My name" and it did pass the value so that should be in order but i don't know why doesn't it get it from the entry box like it should.

I even tried to do e1.insert(0,"some random thing") and text= e1.get() and it did get it so i think there's a problem with the input.

Do i need to use some special kind of input function?

The whole code:

class Gui:

    def __init__(self, controller):
        self.main = tk.Tk()
        self.main.title("DSA Quiz Helper")
        self.__controller = controller

    def IntFixPostExecute(self, event):
        widget = event.widget
        selection = widget.curselection()
        value = widget.get(selection[0])
        self.IntfixPostfixWindow(value)

    def mainWindow(self):
        self.main.geometry("800x500")

        # to do scrollbar
        lb = tk.Listbox(self.main, width=50, height=30)
        lb.insert(1, "Intfix and Postfix Calculator")
        lb.insert(2, "Something else")
        lb.bind("<Double-Button-1>", self.IntFixPostExecute)
        lb.pack()

    def IntfixPostfixWindow(self, value):
        window = self.newWindow(value)

        label = tk.Label(window, text="Intfix to Postfix Convert")
        label.place(x=0, y=20)

        e1 = tk.Entry(window)
        text = e1.get()
        e1.place(x=0, y=50)

        rezultat = tk.Text(window, width=20, height=3)
        rezultat.place(x=0, y=80)

        button = tk.Button(window, text="Enter")
        button.place(x=127, y=46)
        button.bind("<Double-Button-1>", self.passValue(rezultat, text))
        print(text)

    def passValue(self, rezultat, value):
        returnValue = self.__controller.InfixToPostC(rezultat, value)
        rezultat.insert(tk.INSERT, returnValue)

    def newWindow(self, msg):
        newwind = tk.Toplevel(self.main)
        q1 = tk.Frame(newwind)
        q1.pack()
        newwind.geometry("500x230")
        return newwind

    def run(self):
        self.mainWindow()
        self.main.mainloop()

if i set this manually it works. I don't understand why i doesn't work from entrybox input

    text = tk.StringVar()
    e1 = tk.Entry(window, textvariable=text)
    text.set("x+y*2")
    text = e1.get()
    e1.place(x=0, y=50)

I think i figured it out (correct me if i am wrong). I think there is a problem with the button because as soon as a newwindow is open, the button automatically clicks itself, when at first in the entry box there is no text written yet(so it sends to the controller with the initial text(which is empty)). The problem is why the button auto-clicks itself( or anyway auto-runs the function passValue) and why after i input the text and click the button again it does nothing(so as i understand it works only one time and auto-runs itself, at first there is no text in entrybox and the button auto-runs itself,therefore passing an empty string

I can post the whole gui class if you don't understand what is going on from this code snippet — RobertChrisstian, Jun 06 '20 at 10:46
I posted the gui class, i can also post the controller part but i don't really think is relevant because after running the debbuger it showed that text was empty from the start, so it just sended an empty string to the controller — RobertChrisstian, Jun 06 '20 at 12:04
@CoolCloud, something like this: `entry(window, textvariable=text)` . I tried before but i am going to try again maybe it works. Should i declare text as `tk.StringVar` or leave it like a normal string? — RobertChrisstian, Jun 06 '20 at 12:07
as far as ik you shud define a variable bfre using it in tkinter, so mayb it depends on ur need, if it is `StringVar()` or `IntVar()` — Delrius Euphoria, Jun 06 '20 at 12:57
@TiagoOliveira, I think you are right, i wil modify and try to see if it works.Thanks for the help! — RobertChrisstian, Jun 06 '20 at 13:44
@TiagoOliveira, yess it finally works thanks a lot `button = tk.Button(window, text="Enter", command=lambda: self.passValue(rezultat, e1.get()))` This is what i changed — RobertChrisstian, Jun 06 '20 at 13:48
I just copied what i wrote to an answer so other people don't think this is still active :D — Tiago Oliveira, Jun 06 '20 at 13:49

score 1 · Answer 1 · answered Jun 06 '20 at 13:49

You should use entryname.get() to get the text that is inside that entry instead of declaring stringVar() and making that much more unreadable and hard to comprehend and to work with. But this is my point of view! – Tiago Oliveira 48 mins ago
I think what is happening is that u use the method right after declaring the entry widget wich means u are going to get a "" empty string because that's nothing that was written there, u need to replace on the command parameter with entryname.get() instead of declaring variable = entryname.get() and passing that as parameter wich will always be empty! Hope this helps!

How can i get input text from an entrybox in Tkinter?

1 Answers1