Refactor form and submit tag to examples.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Add example for custom html attributes.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Hide field on no item selected on parent field.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>
Add hide on select change configuration and example.

Signed-off-by: Hendra Uzia <hendra.uzia@yahoo.co.id>