Question

How to prevent form submit if validation fails?

I’m working on a web form that requires users to input their name, email, and password. I’ve set up validation, but I can’t figure out how to stop the form from submitting if any inputs are invalid. How can I prevent submission and show error messages for incorrect entries?

Answer 1

1. Client-Side Validation :
- JavaScript : Use JavaScript libraries like jQuery Validation or custom validation functions to check for required fields , data types , email formats, and other criteria.
- HTML5 Validation :  Leverage HTML5 attributes like required , pattern , min, max , type , and step to define validation rules directly in the HTML markup.

2. Server-Side Validation :
- Backend Language : Implement validation logic in your server-side code to ensure data integrity and security
- Error Handling : Provide clear error messages to the user if validation fails, guiding them to correct the input.

3. Combined Approach :
- Client-Side and Server-Side :
1. Utilize both client-side and server-side validation to create a robust and secure system
2. Client-side validation can provide immediate feedback to the user , improving the user experience.
3. Server-side validation is essential for preventing malicious attacks and ensuring data integrity.