[LON-CAPA-users] Image visibility for students

Tue Apr 17 18:55:31 EDT 2012

Stuart!  

Thank you so much.  I appreciate the time you took to investigate this.  I deleted the images folder from the course sequence and the images now show for students.  I really don't know why the images folder had been imported in the first place.

Many thanks,
Will

>>> Stuart Raeburn  04/16/12 5:36 PM >>>
Will,

>> Also, my students are not able to see the images,  but they are
>> able to see the problem, even though both are published using the   
>> same custom
>> rights file.  As a student the name of the image file shows in the problem,
>> not the image.

The presence of spaces in the directory name is unrelated.  The use of  
custom rights is also not the cause of the issue you encountered.

The issue here is that the images used in the questions in your "Ch 25  
Quiz Organic" folder have also been  have explicitly imported into a  
folder: "images" which exists alongside the "Ch 25 Quiz Organic"  
folder within the Ch 25 Organic Chemistry in your course, and the  
contents of that folder are set to "Hidden".

As discussed previously, when you publish a problem which includes  
images, LON-CAPA automatically adds the  tags needed to permit  
student access to the image file when viewing the problem in your  
course. Similarly, when the student's session in the course in  
initialized, access to any images embedded within a problem, to which  
the student has access will be enabled.  Because of this there is no  
need to explicitly import the images into a course.  (Of course you  
may have done that for other reasons).

Anyway, it is the fact that you have the "Hidden" parameter set (via  
the Course Editor) for the "images" folder which is causing students  
to encounter "access denied" for these images.  (Apparently, the  
specific access control for the imported image file overrides any  
access enabled on the basis of the fact that the image file is  
embedded in a problem, to which the student does have access).

A solution to this problem is to select the Course Coordinator role in  
the course using these problems. Then click on "Course Editor", and  
navigate through the hierarchy of folders/subfolders:

Main Course Documents -> Ch 25 Organic Chemistry

to display the contents of "Ch 25 Organic Chemistry".

Uncheck the "Hidden" checkbox for the images file to allow students to  
be able to view the images, when used in the problems.  Unfortunately,  
by doing this you will also allow access to all the images directly  
for students (i.e., outside the context of a problem).

If you don't wish to do that, then you could remove the "images"  
folder, or selectively remove those images which are used in the  
problems. Students currently logged in will need to re-select their  
student roles in your course, for their sessions to reflect this  
change to the contents of the course.

Stuart Raeburn
LON-CAPA Academic Consortium

Quoting William Paddock :

> Yes.  I had a co-author publish these and she used the spaces.  I   
> suppose I could republish in another directory and republish the   
> images.  Hate to duplicate the directory though.
>
> Is there some way of "eliminating the spaces" that I don't know about?
>
> -Will
>
>>>> "Mills, Douglas G"  4/16/2012 2:06 PM >>>
> It may not be related to the problem you're experiencing, but having spaces
> in file or directory names which become part of URLs can and does sometimes
> lead to unpredictable consequences... I would try eliminating the spaces in
> the names just in case that makes a difference.
>
> Doug
>
>
> On 4/16/12 12:59 PM, "William Paddock"  wrote:
>
>> Thanks Ray.  It appears that the "allow" was added during the publication
>> process.  Here is the code of the problem...
>>
>> 
>>     > src="/res/author/Paddock_Wa/ChemistryLibrary/OrganicChem/MultiChoice25/ch 25
>> images/f1q103g1.jpg" encrypturl="no" height="176" />
>>  
>>
>> What is the name of this compound? 
>>
>> 
>> 
>> 
>> 
>> > src="/res/author/Paddock_Wa/ChemistryLibrary/OrganicChem/MultiChoice25/ch 25
>> images/f1q103g1.jpg" />
>> 
>>
>> Any other ideas??
>>
>>>>> Raymond Batchelor  4/16/2012 1:50 PM >>>
>> Just before the  closing tag, include some  tags which
>> specify the images you want.
>>
>> You can select that tag from the colorful "Edit" interface drop lists and
>> insert it at the end of your problem and select the images you want to be
>> "allowed".
>>
>>
>> ----- Original Message -----
>> From: "William Paddock" 
>> To: lon-capa-users at mail.lon-capa.org
>> Sent: Monday, 16 April, 2012 09:03:43
>> Subject: [LON-CAPA-users] Image visibility for students
>>
>> Hi All,
>>
>> I have a question about the visibility of published images.  I have some
>> images published using a custom rights file.  When these images are  
>>  used in a
>> problem I am able to see them inside course coordinator and   
>> instructor roles,
>> but I am not able to see the images inside the problem when I switch to
>> student view.  Also, my students are not able to see the images,   
>> but they are
>> able to see the problem, even though both are published using the   
>> same custom
>> rights file.  As a student the name of the image file shows in the problem,
>> not the image.
>>
>> Any ideas on how I can get these images visible to students?
>>
>> Here is an example of a problem...
>>
>> res/author/Paddock_Wa/ChemistryLibrary/OrganicChem/MultiChoice25/MultiChoice25
>> /question_103.problem
>>
>> and an image...
>>
>> res/author/Paddock_Wa/ChemistryLibrary/OrganicChem/MultiChoice25/ch 25
>> images/f1q103g1.jpg
>>
>> Both are published under...
>>
>> /res/author/Paddock_Wa/ChemistryLibrary/BLBcopyright.rights
>>
>> and the problem shows
>>
>> rule_rights:
>>    
>> deny:::course,allow:author::course,allow:elps::course,allow:lsd::course,allow
>> :wmston::course
>>
>> The course is in the elps domain.  My user is in the author domain.  All
>> students users are elps domain.
>>
>> Thanks for any help,
>>
>> Will Paddock
>>
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>
>
> Doug
>
> Douglas Mills
> Director of Instructional Technologies
> Department of Chemistry
> University of Illinois
> dmills at illinois.edu
> (217) 244-5739

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