How to count time elapsed from the moment a popup appeared till it was clicked in javascript?

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compute elapsed time in JavaScript

I am trying to construct a lexical decision task for my psychology project.

The task is in javascript: a popup with a word appears and a user clicks yes or no depending on whether the word is grammatical.

I need to count the time between the appearance of the popup and the user click. Could you tell em what needs to be done.

http://stackoverflow.com/questions/1210701/compute-elapsed-time-in-javascript second answer =) — el Dude, Dec 01 '12 at 19:48

score 3 · Answer 1 · answered Dec 01 '12 at 19:48

when the pop-up appears you could store the current time retrieved with this statement:

var createDate = new Date().getTime();

Then when the user click on Yes or No you retrieve the new date and compute the difference with the previous timestamp:

var delay = new Date().getTime() - createDate;

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