If you don't want this feature you can read the setup guide on how to disable it.
There are two ways you can give suggestions to the user while the user types.
validator Function - Callback function that validates the input.
If you feel the need to configure your form validation using Java Script you probably should look into jquery-validation or or any of the other superb form validation solutions out there.
But there is of course a way to accomplish this using j Query-Form-Validator as well, by using the module name - The name of the validator, which is used in the validation attribute of the input element.
Note that you also can use inline error messages in your form.
The following form contains some typical validators needed in a registration form.