How to track web user filling patterns on my web form?

I am looking for some libraries or articles or ideas regarding how I can track some customer behavioral patterns when he/she fills my web form. Later I want to apply machine learning to identify fraud or customers in stress. Those patterns can be: speed of typing, number of corrections, entering completely different values, going to the previous step several times and changing his choice, etc.. Actually, the most difficult part is to identify the pattern and to define the type of those patterns (more of those stated above)

I tried googling but couldn't find anything appropriate at all. I dont know where to start