The changed getFolderId() method from revision 1.1.2.116 does in fact 
fix my problem. Here's a transcript of my debugging session with 
Google Chrome's JavaScript debugger:



Using the pre-1.1.2.116 code:



$ break DimpBase.js:1574

set breakpoint #1

paused at breakpoint 1: #<an Object>.createFolder(ob=#<an Object>, 5), 
https://some-server/dimp/js/DimpBase.js

1574:                 parent_e = (parent_e) ? parent_e.down('UL') : 
$('normalfolders');

$ p parent_e

#<an HTMLLIElement>

$ p parent_e.down('UL')

undefined

$ p parent_e.innerHTML

<ul></ul>



Using the getFolderId()-function from rev. 1.1.2.116:



paused at breakpoint 1: #<an Object>.createFolder(ob=#<an Object>, 5), 
https://some-server/dimp/js/DimpBase.js

1574:                 parent_e = (parent_e) ? parent_e.down('UL') : 
$('normalfolders');

$ p parent_e

#<an HTMLLIElement>

$ p parent_e.down('UL')

#<an HTMLUListElement>

$ p parent_e.innerHTML

<ul></ul>



Oddly enough the <ul>-element actually exists in both cases, but for 
some reason the down() method can't seem to navigate to it.

I can't reproduce this either with this code or with the slightly 
different way we calculate the folder ID in HEAD.  I've gone ahead and 
backported the change from HEAD into DIMP 1.1.1 - let me know if that 
fixes things for you (see commit message contained in this ticket's 
history).

Changes have been made in CVS for this ticket:

http://cvs.horde.org/diff.php/dimp/js/DimpBase.js?r1=1.1.2.115&r2=1.1.2.116&ty=u
http://cvs.horde.org/diff.php/dimp/js/src/DimpBase.js?r1=1.1.2.115&r2=1.1.2.116&ty=u

When rendering the folder list in DIMP the following HTML code is generated:



<li ftype="folder" mbox="INBOX.Foldername" l="Foldername" 
id="fldINBOX.Foldername" class="folder">

        <div id="fldINBOX.Foldername_div" class="exp">

        </div>



        <a title="Foldername" id="fldINBOX.Foldername_label">Foldername</a>

</li>



<li style="display: none;" id="subfldINBOX.Foldername" class="subfolders">

        <ul>

        [...]

        </ul>

</li>



Later on DIMP tries to find the <ul>-tag in order to add subfolders. 
However - using certain browsers like Google Chrome and Safari - the 
code that is responsible for finding the <ul>-tag returns 'undefined' 
which causes the entire folder list to not be shown at all (the 
"Loading..." <div> is shown instead):



DimpBase.js, line 1574:

parent_e = (parent_e) ? parent_e.down('UL') : $('normalfolders');



parent_e is set, however parent_e.down('UL') returns undefined.



Changing the function that is responsible for the id names of the HTML 
tags so that dots in the folder names are replaced with underscores 
appears to solve this problem.