How to show products selected by default?

bom dia!

como faço para ao colocar a quantidade e aultomatico a caixa de seleção preencher automatico sem eu precisar clicar para ficar ticado ou selecionado.

Hello ronildosousa,

I am not sure if I have understood your question correctly. Do you mean to say that you want the product to be selected by default and also you want the quantity field to be filled in?

Please check the screenshot below on how to make products selected by default and also display default quantity value as well:

Hope this helps.

Do get back to us if you meant to ask something else.

Thank you!

não oque eu quero é que o produto seja selecionado ao ser preenchido o campo quantidade.

https://www.jotform.com/71515932379665 

It is not possible, because you have setup the products through native fields instead of the payment field. So, the check box and the quantity box are separate fields. 

What you can do is to setup a condition that required the check box field if the quantity field is filled. Please check this guide to learn how to do it: https://www.jotform.com/help/367-How-to-Make-a-Field-Required-Based-on-User-s-Answer 

Let us know if you need more help, we will be glad to assist you.