Second, create two StringVar objects: self.password_var = tk.StringVar() WARNING = 'Warning.TLabel' Code language: Python ( python ) t_message( "Error: Passwords don't match!", self.SUCCESS)įirst, define two constants ERROR and SUCCESS that will be set to the message_label based on the result of the validation: ERROR = 'Error.TLabel' t_message( 'Warning: Keep entering the password') Return if password.startswith(confirm_password): "Success: The new password looks good!", self.SUCCESS) Submit_id(column= 0, row= 3, **padding)ĭef set_message (self, message, type=None): """ set the error or success messageĭef validate (self, *args): """ validate the passwordĬonfirm_password = nfirm_password_var.get() Submit_button = ttk.Button(self, text= 'Change') Self, textvariable=nfirm_password_var, show= '*')Ĭonfirm_id(column= 1, row= 2, **padding) Ttk.Label(self, text= 'Confirm Password:').grid( Password_id(column= 1, row= 1, **padding) Self, textvariable=self.password_var, show= '*') Ttk.Label(self, text= 'New Password:').grid(column= 0, row= 1, **padding) ssage_id(column= 0, row= 0, columnspan= 3, **padding) ( 'Success.TLabel', foreground= 'green')ĭef create_widgets (self): """ create a widget nfirm_password_var.trace( 'w', self.validate) SUCCESS = 'Success.TLabel' def _init_ (self): Self.output_nfig(text=self.name_var.get())Īpp.mainloop() Code language: Python ( python ) Self.output_id(column= 0, row= 1, columnspan= 3, **padding) Submit_button = ttk.Button(self, text= 'Submit', command=self.submit) Name_entry = ttk.Entry(self, textvariable=self.name_var) Ttk.Label(self, text= 'Name:').grid(column= 0, row= 0, **padding) The following example illustrates how to use the StringVar object for an Entry widget: import tkinter as tk 'u' (unset) – invoke the callback whenever the variable is deleted.'r' (read) – invoke the callback whenever the variable is read.The StringVar also provides you with two other modes 'r' and 'u': The 'w' mode will automatically invoke the callback whenever the value of the string_var changes. To invoke a callback whenever the value of an StringVar object changes, you use the trace() method of the StringVar object: string_var.trace( 'w', callback) Code language: Python ( python ) This feature is useful if you want to automatically update other widgets based on the current value of the StringVar object. The StringVar object will notify you whenever its value changes. To get the current value of the Entry widget, you can use the get() method of the StringVar object: name_var.get() Code language: Python ( python ) PY_VAR1, PY_VAR2, etc.Īfter creating the StringVar object, you can assign it to the textvariable of a widget that accepts a StringVar object.įor example, the following assigns the string_var to textvariable of the Entry widget: name_entry = ttk.Entry(root, textvariable=string_var) Code language: Python ( python )
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