Part 5: Exploring Form Validation in PySimpleGUI

In Part 5 of this introductory tutorial series on PySimpleGUI, we will be covering form validation. Form validation is an essential aspect of any GUI application as it ensures that the input provided by the user is valid before processing it further. In this tutorial, we will be using PySimpleGUI to create a simple form with input fields and demonstrate how to perform validation on these fields.

To get started, make sure you have PySimpleGUI installed by running the following command:

pip install PySimpleGUI

Now let’s create a new Python script and import PySimpleGUI:

import PySimpleGUI as sg

Next, let’s define our form layout with input fields and a submit button:

layout = [
    [sg.Text('Name:'), sg.InputText(key='name')],
    [sg.Text('Email:'), sg.InputText(key='email')],
    [sg.Button('Submit')]
]

Now, let’s create the window using the layout defined above:

window = sg.Window('Form Validation', layout)

Next, let’s create a loop to handle events and user input:

while True:
    event, values = window.read()

    if event == sg.WIN_CLOSED:
        break

    if event == 'Submit':
        # Perform form validation here
        if not values['name']:
            sg.popup_error('Name is required')
        elif not values['email']:
            sg.popup_error('Email is required')
        else:
            # Process the input data
            sg.popup('Form submitted successfully')

In the code above, we check if the user clicks the submit button and perform form validation by checking if the input fields are not empty. If any of the fields are empty, we display an error popup. Otherwise, we process the input data and display a success message.

Finally, don’t forget to close the window at the end of the loop:

window.close()

That’s it! You have successfully implemented form validation using PySimpleGUI. You can expand on this example by adding more input fields and implementing more complex validation logic as needed for your application.

In conclusion, form validation is a crucial part of any GUI application to ensure the data entered by the user is valid. PySimpleGUI provides a simple and intuitive way to perform form validation efficiently. I hope this tutorial has helped you understand how to implement form validation in PySimpleGUI. Thank you for reading!