where I can find the "manual" explaining all the parameters in var url_ext = '/export?' +'format=pdf' +'&size=a4' //A3/A4/A5/B4/B5/letter/tabloid/legal/statement/executive/folio +'&portrait=true' //true= Potrait / false= Landscape +'&scale=1'

It's works fine for me, but when I tried the same with an hidden shhet it thows an error..

Thank you very much