Hi Ray,
What, if any, is the best way for an author or course coordinator
to prevent students' browsers caching answers in a problem?
I doubt this is a caching issue.
When rendering a problem the response header sent to the browser by
LON-CAPA includes:
Pragma: no-cache
Cache-Control: no-cache
Expires: <current date/time>
However, if the problem is being displayed after a student has made
prior submissions, and the status is CAN_ANSWER then the most recent
submission will be displayed in the textbox where the student enters
an answer.
Some possibilities which could be implemented currently:
(a) Set the question type for the problem to "New Randomization Each N
Tries (default N=1)"
or
(b) Add a javascript function to be called on page load to set the
value attribute for all <input> form elements with name or id
beginning with the string: HWVAL_ to ''.
Other possibilities, which would require modifications to LON-CAPA,
would be to optionally exclude $oldresponse from the value attribute
on the server side when the content is being rendered, and also to add
a javascript function, as outlined in (b), to LON-CAPA itself, and
then provide a parameter, settable by the CC, to determine whether to
exclude $oldresponse and also run the javascript function on page load.
Stuart Raeburn
LON-CAPA Academic Consortium
Quoting Raymond Batchelor <batch...@sfu.ca>:
Hi All,
What, if any, is the best way for an author or course coordinator
to prevent students' browsers caching answers in a problem?
--
Ray
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