SEF URL field as combination of 2 fields in Admin UI - how to do it?

[Jimmi08]

Is it possible to generate sef-url value as combination of 2 fields?

This is from one field:
'writeParms' => array('size' => 'xxlarge&sef=topictext', 'sef' => 'topictext'),

Or is it possible without admin UI at all? Just in normal form? What is trigger for this or something like that?

Thanks

[3l3ktr0n]

I guess just combine the 2 strings and after title2sef the variable

[Jimmi08]

Thanks for your answer. Not sure what you mean :)

I can do this in after update method, or in the field with type "method". What I don't know is how to get the same behavior as in normal sef field. But I didn't get to this in deep... for now I just disabled that field - I don't allow to edit it - and it is generated and overwritten when saving the record.