It's up to you to code and style it as you like. Here's how web2py does it: 
https://github.com/web2py/web2py/blob/master/gluon/html.py#L1826. If you 
want it exactly as web2py does it, then just use 
form.custom.widget.fieldname instead of completely manual HTML. See 
http://web2py.com/books/default/chapter/29/07/forms-and-validators#Custom-forms
.

Anthony

On Thursday, January 16, 2014 8:12:24 AM UTC-5, sasogeek wrote:
>
> How do I highlight the fields with errors though? like it appears in the 
> tutorials? example please.
>
> On Wednesday, 15 January 2014 14:41:11 UTC, Anthony wrote:
>>
>> Error messages are in form.errors.fieldname (if it is None, there is no 
>> error for that field).
>>
>> On Wednesday, January 15, 2014 8:49:23 AM UTC-5, sasogeek wrote:
>>>
>>> I have a crud login and registration form with my own html, I don't 
>>> extend the layout.html. How do I display the form errors when a user 
>>> submits empty or invalid inputs?
>>
>>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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