交互式框图

I need to create something like interactive block diagram using JavaScript and PHP. For example, a question is displayed in front of a person, depending on his answer, another question is highlighted, and so on. The path followed by the user is saved.

Example:
Question: Do you need additional service?
There are two possible answers:
1) Yes
2) No

1) -> What services do you need? (after answering this question there will be next question, etc.)
2) -> Ok

I would like to ask for help about advice on how to store data, and how to implement it in general. It would be great if there is any kind of library for creating such things.