Hi Stuart, To clarify. The issue is/was this: Students in a lab, use the same computers (sharing the same Windows account and FireFox browser) to submit answers to a few questions, before they leave. We found that, unless we disabled history on those browsers, when students started to enter a numerical answer, the entire history of previous submissions by other students popped to view. Kind of "gave the game away". We have disabled history in those browsers for which it was previously enabled, and thus resolved that particular localized issue.
Though, it would be nice to be able to selectively block history, for specific response fields (I suppose), in some instances. Thanks, Ray ----- Original Message ----- From: "Stuart Raeburn" <raeb...@msu.edu> To: lon-capa-users@mail.lon-capa.org Sent: Friday, 7 November, 2014 12:23:13 Subject: Re: [LON-CAPA-users] Disabling remote browser caching answers? 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 > _______________________________________________ > LON-CAPA-users mailing list > LON-CAPA-users@mail.lon-capa.org > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users _______________________________________________ LON-CAPA-users mailing list LON-CAPA-users@mail.lon-capa.org http://mail.lon-capa.org/mailman/listinfo/lon-capa-users -- Raymond J. Batchelor, PhD. Department of Chemistry Simon Fraser University Phone: 778-782-5635 _______________________________________________ LON-CAPA-users mailing list LON-CAPA-users@mail.lon-capa.org http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
