Building a Signup Form with Validation
In this project, you will bring together all the validation techniques you have learned to build a practical signup form. The form will collect four fields from the user: username, email, password, and confirm password. Each field must meet specific validation requirements to ensure data quality and a smooth user experience:
- Username: must not be blank; must be at least 3 characters; can only contain letters, numbers, and underscores;
- Email: must not be blank; must match a standard email format;
- Password: must not be blank; must be at least 8 characters; must include at least one letter and one number;
- Confirm Password: must match the password field exactly.
You will use a combination of HTML5 validation attributes, custom JavaScript logic, regular expressions, and user feedback techniques such as inline error messages and valid/invalid visual styles.
script.js
index.html
style.css
This signup form uses several validation techniques to ensure that user input is both correct and helpful. Each field leverages HTML5 attributes such as required, minlength, type, and pattern to provide basic, built-in validation. For example, the username field uses required, minlength="3", and a pattern that only allows letters, numbers, and underscores. The email field uses type="email" and required, while the password field uses required and minlength="8".
Custom JavaScript validation functions handle more complex requirements and provide real-time feedback as the user types. When a field is invalid, the script adds the invalid class to the input and shows a specific error message below the field. If the input is valid, the valid class is added and the error message is cleared. Regular expressions are used in JavaScript to check the username pattern, validate the email format, and ensure the password includes both letters and numbers. The confirm password field is checked to ensure it matches the password exactly.
This approach combines the strengths of HTML5 validation and custom JavaScript logic. Users receive immediate, inline feedback for errors, and the form cannot be submitted unless all fields are valid. The visual cues provided by valid and invalid styles help guide users to fix any issues before submitting the form.
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Completion rate improved to 5.56Building a Signup Form with Validation
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In this project, you will bring together all the validation techniques you have learned to build a practical signup form. The form will collect four fields from the user: username, email, password, and confirm password. Each field must meet specific validation requirements to ensure data quality and a smooth user experience:
- Username: must not be blank; must be at least 3 characters; can only contain letters, numbers, and underscores;
- Email: must not be blank; must match a standard email format;
- Password: must not be blank; must be at least 8 characters; must include at least one letter and one number;
- Confirm Password: must match the password field exactly.
You will use a combination of HTML5 validation attributes, custom JavaScript logic, regular expressions, and user feedback techniques such as inline error messages and valid/invalid visual styles.
script.js
index.html
style.css
This signup form uses several validation techniques to ensure that user input is both correct and helpful. Each field leverages HTML5 attributes such as required, minlength, type, and pattern to provide basic, built-in validation. For example, the username field uses required, minlength="3", and a pattern that only allows letters, numbers, and underscores. The email field uses type="email" and required, while the password field uses required and minlength="8".
Custom JavaScript validation functions handle more complex requirements and provide real-time feedback as the user types. When a field is invalid, the script adds the invalid class to the input and shows a specific error message below the field. If the input is valid, the valid class is added and the error message is cleared. Regular expressions are used in JavaScript to check the username pattern, validate the email format, and ensure the password includes both letters and numbers. The confirm password field is checked to ensure it matches the password exactly.
This approach combines the strengths of HTML5 validation and custom JavaScript logic. Users receive immediate, inline feedback for errors, and the form cannot be submitted unless all fields are valid. The visual cues provided by valid and invalid styles help guide users to fix any issues before submitting the form.
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