CODEWITHSUNDEEP
pythontkinter
user1527216
user1527216

Reputation: 1173

Check what tkinter OptionMenu item was selected

How do you check if the user has selected "Other" from the hopOptions selection, and then enable otherEntry if they did? And then disable it again if they select one of the other options.

    class Interface():
        def __init__(self, window):
            frame = Frame(window)
            frame.pack()

            self.hopLabel = Label(frame, text="Hop:", anchor=E)
            self.hopLabel.grid(row=0, column=0, sticky=EW)

            hops = range(0,6)
            hops.append("Other")

            self.selectedHop = StringVar(frame)
            self.selectedHop.set(hops[0])
            self.hopOptions = OptionMenu(frame, self.selectedHop, *hops)
            self.hopOptions.grid(row=0, column=2, sticky=EW)

            self.otherEntry = Entry(frame, state=DISABLED)
            self.otherEntry.grid(row=0, column=1, sticky=EW)

    root = Tk()

    app = Interface(root)

    root.mainloop()

Upvotes: 1

Views: 4488

Answers (2)

Kevin
Kevin

Reputation: 76194

As an alternative to iChar's command approach, Use selectedHop.trace to register a function that will be called whenever the selected item changes.

from Tkinter import *

class Interface():
    def __init__(self, window):
        frame = Frame(window)
        frame.pack()

        self.hopLabel = Label(frame, text="Hop:", anchor=E)
        self.hopLabel.grid(row=0, column=0, sticky=EW)

        hops = range(0,6)
        hops.append("Other")

        self.selectedHop = StringVar(frame)
        self.selectedHop.set(hops[0])
        self.selectedHop.trace("w", self.selected_hop_changed)
        self.hopOptions = OptionMenu(frame, self.selectedHop, *hops)
        self.hopOptions.grid(row=0, column=2, sticky=EW)

        self.otherEntry = Entry(frame, state=DISABLED)
        self.otherEntry.grid(row=0, column=1, sticky=EW)

    def selected_hop_changed(self, *args):
        value = self.selectedHop.get()
        if value == "Other":
            self.otherEntry.config(state=NORMAL)
        else:
            self.otherEntry.config(state=DISABLED)


root = Tk()

app = Interface(root)

root.mainloop()

Upvotes: 2

user3960432
user3960432

Reputation:

Bind the option menu to a command and add another method to your class. The command will run the class method with the value as an argument anytime an option is changed in the menu. There you can do validation to update the otherEntry widget. Also I would advise not doing from Tkinter import * as it appears that's what you've done. Generally importing an entire package could have conflicts with your namespace. This should suit your needs:

from Tkinter import *

class Interface():
        def __init__(self, window):
            frame = Frame(window)
            frame.pack()

            self.hopLabel = Label(frame, text="Hop:", anchor=E)
            self.hopLabel.grid(row=0, column=0, sticky=EW)

            hops = range(0,6)
            hops.append("Other")

            self.selectedHop = StringVar(frame)
            self.selectedHop.set(hops[0])
            self.hopOptions = OptionMenu(frame, self.selectedHop, *hops, command=self.optupdate)
            self.hopOptions.grid(row=0, column=2, sticky=EW)

            self.otherEntry = Entry(frame, state=DISABLED)
            self.otherEntry.grid(row=0, column=1, sticky=EW)

        def optupdate(self, value):
            if value == "Other":
                self.otherEntry.config(state=NORMAL)
            else:
                self.otherEntry.config(state=DISABLED)

if __name__ == "__main__":
    root = Tk()
    app = Interface(root)
    root.mainloop()

Upvotes: 3

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