Simple form validation

Here is a simple form validation example implemented in JavaScript. It demonstrates how to use JavaScript to validate form fields and perform field validation before the form is submitted.

Purpose

This example can be implemented as a basic form validation that you can gradually extend and customize according to your needs and project requirements.

how to use

1. Copy and paste the JavaScript code into your project.
2. Open the relevant HTML file and you will see a simple form validation example.
3. Enter your username and password and try to submit the form. If the input field is empty, you will see an appropriate error message.

Extension code

You can extend this example to suit your specific needs, for example:

• Add more form fields
• Implement email format validation
• Implement password strength verification
• Integrated backend validation

Screenshot example

[Add a screenshot or dynamic demo here to visually demonstrate the form validation functionality]

Copyright and License

This example is released under the MIT License.