Thanks, but why this is working

        form.components.append(A('Indietro',_class='btn btn-default', 
_onclick="window.history.back()"))

and this is not working?

         form.append(BUTTON('Indietro', _onclick="window.history.back()"))


Il giorno lunedì 11 settembre 2017 01:06:00 UTC+2, Massimo Di Pierro ha 
scritto:
>
> You cannot add buttons to a readonly crud form because it has no button 
> row. You can do:
>
> form.components.append(A('Back',_onclick="window.history.go('-1')"))
>
>
> On Sunday, 3 September 2017 13:49:31 UTC-5, Andrea Fae' wrote:
>>
>> I use in a  method this 
>>         form=crud.read(db.evento,evento)
>>
>> and the html vies is very simple
>>
>> {{extend 'layout.html'}}
>> <h1>Evento</h1>
>> {{=form}}
>>
>>
>> how to add a simple button to go back in the previous page? I tried 
>>         form.add_button('Back', URL('index'))
>>
>> but I have this error
>> <type 'exceptions.AttributeError'> 'NoneType' object has no attribute 
>> 'parent'
>>
>> Thanks
>>
>>

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