How do I detect "the mode of redirection" using javascript?

During a browsing session, redirection usually occurs when,

1. user clicks on an anchor element,
2. user presses the reload button on browser,
3. user clicks on any element and execute a javascript redirection, using window.location properties,
4. programmatic (by javascript) redirection using window.location properties,

(There sho开发者_JS百科uld be more)

I am trying to develop a javascript which I can classify them into two categories:

User-initiated and Programmatic.

I have tried a few prototypes but they aren't working.

Would anyone give me a hint?