Update Lambda function arguments on button click

Question

I've snipped out parts of the code, as i suspect the answer is quite newbie :)

I am trying to validate the input in the Entry by clicking the button (which references to a validation funciton). However the path_directory-variable are not updated (it keeps the initial value).

How do I update it when the button is clicked?

directory = tk.Entry(entry_frame)

validate_button= tk.Button(paths_frame, text='Next', command=lambda path_directory=directory.get(): self.validate_path(path_directory)) 

def validate_path(self, path_directory):
        if path.exists(path_directory):
            print('# Path validation succuessful: ', path_directory)
        else: 
            print('# Path validation failed: ', path_directory)

rizerphe · Accepted Answer · 2020-05-07 11:35:56Z

1

The problem is that you are getting the value only on lambda init. Simply use a function, not lambda, like this:

def validate_click():
    path_directory=directory.get()
    self.validate_path(path_directory)
validate_button= tk.Button(paths_frame, text='Next', command=validate_click)

Hope that's helpful!

answered May 7, 2020 at 11:35

rizerphe

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