CODEWITHSUNDEEP
pythontkinter
Alexis
Alexis

Reputation: 17

Enabling the submit button, when a user makes the first letter capital

Is there an easier or simpler way to enable the submit button, when the user makes the first letter of a word capital? (I don't want the user to submit lower case words)

def enable_sumbit_button(*event):

    self.uppercase_letters = ['A', 'B', 'C', 'D', 'E', 'F', 'G',  'H', 'I','J', 
    'K','L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'W', 'X', 'Y', 'Z']

    self.user_message = self.entry_box.get()
    self.send_button.configure(state='disabled')

    if self.user_message[0] in self.uppercase_letters:
        self.send_button.configure(state='normal')

self.send_button = Button(self.main_window,text="SEND", command=print_user_message, state='disabled')
self.send_button.place(x=410, y=215, width=50, height=28)
self.main_window.bind("Entry","<FocusOut>", enable_sumbit_button)
self.user_input.trace('w', enable_sumbit_button)

Upvotes: 0

Views: 50

Answers (3)

Paul Cornelius
Paul Cornelius

Reputation: 10936

Python strings have a method isupper() that tests for upper case. Also your string self.user_message is probably not guaranteed to have any elements (if the user backspaces over the only character in the field). In that case you get an exception when you try to access [0]. So you should check for a non-empty string first before you check the case of the first character.

def enable_sumbit_button(*event):

    self.user_message = self.entry_box.get()
    self.send_button.configure(state='disabled')

    if self.user_message and self.user_message[0].isupper():
        self.send_button.configure(state='normal')

Upvotes: 0

marcos
marcos

Reputation: 4510

Just use the isupper method of strings.

if self.user_message[0].isupper():
   ...

Upvotes: 1

sciroccorics
sciroccorics

Reputation: 2427

An easier alternative would be to force the content of the Entry widget to uppercase, as soon as it looses the focus (or when user validates by pressing the Enter key), so there is no more need to disable the submit button:

def convert_uppercase(*event):
    self.entry_box.set(self.entry_box.get().upper())

and bind the <FocusOut> event as you did:

self.main_window.bind("Entry","<FocusOut>", convert_uppercase)

You may even totally remove the convert_uppercase function and perform the corresponding job into the callback function of your submit button.

Upvotes: 1

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