View source for How to make sure that users see the right page when they log back into the intervention

You can use a combination of <code>hasseen, comparetimes, isempty</code> to show users specific pages when they log back in.

===Example 1===

<code>after login2 if (and(...
comparetimes(loadvalue(username,"baselinetime"), currenttime(),"seconds") >= fourweeks,...
isempty(loadvalue(username,"followup_done"))...
hasseen(username,"page10") )) goto followup</code>
 
You can write the time in seconds (604800) in place of '''fourweeks''' in the logic above, but writing it as <code>fourweeks</code> means that you can change the times more easily when you test your intervention.

The logic above will show the page '''followup''' if all of the following are true/have happened:

- It has been more than ten weeks since '''baselinetime''' was saved

- The variable '''followup_done''' has not been saved (i.e. the variable '''followup_done''' is empty because the follow-up has not been completed) 

- '''page10''' has been seen by the user


In order for the above logic to work, the following should have been written in the logic in the appropriate places:

- '''baselinetime''' should be saved when the last page of the baseline questions is shown to the user, e.g.:
<code>
savevalue(username,"baseline_time", currenttime() )</code>

- '''fourweeks''' should have been set at the top of the logic file, e.g.:

<code>set tenweeks to 604800</code>

- '''followup_done''' should be saved when the last page of the follow-up questions was shown to the user, e.g.:

<code>savevalue(username, "followup_done", "yes")</code>