Is it possible to highlight lines one by one?

[KnockOutEZ]

I want to generate the coordinates of each line so I can use them in the Highlight annotation:

I want to iterate one after another line and highlight them. How can I achieve this?

I also wanna add another question which is, can I trigger a function on line click? For example I click on line 100 in whole pdf, and it triggers a function returning 100 (The index of the line in whole pdf).

[taoky]

I don't think this works as there is no such concept of "line number" or "line" in PDF, as it is originally a complex format designed for printing instead of editing.