It is important to validate the form submitted by the user because it can have inappropriate values. Java Script provides facility to validate the form on the client-side so data processing will be faster than server-side validation.
Most of the web developers prefer Java Script form validation.
We want to make sure that we are validating their input before it is committed to CRM.
This way we ensure that our data is clean and meaningful to us and the customer.
Note that we want to prevent the form from being validated before its submission and display default error messages (different on each browser). We style input fields by taking advantages of :valid and :invalid CSS pseudo-classes.Through Java Script, we can validate name, password, email, date, mobile numbers and more fields.