in my current surveyjs form I validate the errors at the end just when the user clicks on the send button.
but for a particular need I want to add a question in the first page and this question must be mandatory and if the user does not answer this question he will not be able to move on to the next page.
I summarize:
Add a checkbox to accept the general conditions of use, if he does not check he will not be able to move on to the next page, so we validate before he navigates to the next part, but once he has checked the next ones page (33 in my case) will be validated at the end with onComplete, basically the first page will be with onChange validation and from the 2nd until the end will be in onComplete validation.

Is there a way to override a field value with one parsed from URLSearchParams?
I’d like to fill an hidden field if a specific parameter is passed by the URL.

I am trying to implement the backend in c# for loading and saving surveys. I have seen the sample and it is using JSON string, is there documentation available for objects and properties that will help me build these c# objects?

I’m using surveyJS to create an NPS question (from 0 to 10), using numbers in one scale and smiley faces in the other. However, when viewed from a mobile device, it turns into a dropdown and the smiley faces are replaced with numbers. Now I know its a responsive design, but most users use a mobile device and the dropdown style is just not suited for this question. Is there an override?