I finally got around to implementing the multi-select suggested by Anthony (
http://quasipartikel.at/multiselect_next/). It works fine, with a gotcha or 
two that might be my ignorance. Its use of <div> doesn't seem to play nice 
with web2py, so some layout broke from using 'regular' multi-select and the 
suggested one. I added some table 'formatting' and that fixed it. Sort of a 
'hammer' approach rather than a high-tech fix, but it works. I'm not 
skilled enough in css/html to determine what the new multi-select was doing 
with divs (and who knows; it might not even be divs), but other than that 
layout problem it works well, and has some nice config/run-time functions 
(sorting, etc.).

On Monday, July 9, 2012 5:47:13 PM UTC-6, villas wrote:
>
> That's good,  I thought you still might have some other requirement(s). 
>  Anyhow,  if you implement it, please advise how it goes.  I might try 
> switch to that one if you found it easy to use.  All the best,  David
>
>
> On Tuesday, July 10, 2012 12:10:50 AM UTC+1, MichaelF wrote:
>>
>> Nothing's wrong with Anthony's answer; I like it.
>>
>> On Monday, July 9, 2012 4:54:42 PM UTC-6, villas wrote:
>>>
>>> I used this one once:
>>> http://www.senamion.com/blog/jmultiselect2side.html
>>>
>>> However,  it appears the one Anthony suggested would be better -- what's 
>>> wrong with that suggestion?
>>>
>>>
>>> On Sunday, July 8, 2012 9:00:04 PM UTC+1, MichaelF wrote:
>>>>
>>>> Thanks, Bruno. That's not quite what I need for this job, but I do need 
>>>> that in another. I need something more like what Anthony posted (
>>>> http://quasipartikel.at/multiselect_next/).
>>>>
>>>> On Sunday, July 8, 2012 12:42:09 PM UTC-6, rochacbruno wrote:
>>>>>
>>>>> I guess you need this:
>>>>>
>>>>>
>>>>> http://www.web2pyslices.com/slice/show/1526/cascading-drop-down-lists-with-ajax-2
>>>>>
>>>>>
>>>>>
>>>>> *Bruno Cezar Rocha*
>>>>>
>>>>> http://www.CursoDePython.com.br
>>>>> [image: Facebook] <http://facebook.com/rochacbruno> [image: 
>>>>> Twitter]<http://twitter.com/rochacbruno> [image: 
>>>>> LinkedIn] <http://linkedin.com/in/rochacbruno> [image: 
>>>>> about.me]<http://about.me/rochacbruno> [image: 
>>>>> Amazon] <http://amazon.com/author/rochacbruno> [image: 
>>>>> AngelList]<http://angel.co/rochacbruno> [image: 
>>>>> Blog RSS] <http://www.web2pyslices.com/slice/list.rss?author=1> [image: 
>>>>> Facebook Page] <http://facebook.com/CursoDePython> [image: 
>>>>> foursquare]<http://foursquare.com/rochacbruno> [image: 
>>>>> Google Plus] <https://plus.google.com/u/0/116110204708544946953/posts> 
>>>>> [image: 
>>>>> pinterest] <http://pinterest.com/rochacbruno> [image: 
>>>>> SlideShare]<http://slideshare.com/rochacbruno> [image: 
>>>>> YouTube] <http://youtube.com/user/brunovegan>
>>>>>  [image: Google Talk] rochacbruno [image: Skype] blouweb
>>>>> Blog: Generate a thumbnail that fits in a 
>>>>> box<http://www.web2pyslices.com/slice/show/1522/generate-a-thumbnail-that-fits-in-a-box>
>>>>>   Get a signature like this. 
>>>>> <http://r1.wisestamp.com/r/landing?promo=18&dest=http%3A%2F%2Fwww.wisestamp.com%2Femail-install%3Futm_source%3Dextension%26utm_medium%3Demail%26utm_campaign%3Dpromo_18>
>>>>>  Click 
>>>>> here.<http://r1.wisestamp.com/r/landing?promo=18&dest=http%3A%2F%2Fwww.wisestamp.com%2Femail-install%3Futm_source%3Dextension%26utm_medium%3Demail%26utm_campaign%3Dpromo_18>
>>>>>    
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Jul 8, 2012 at 3:10 PM, MichaelF wrote:
>>>>>
>>>>>> I'm aware of the multiple and checkbox widgets. I'm looking for a 
>>>>>> widget whose name I don't know. It consists of two side-by-side boxes, 
>>>>>> each 
>>>>>> box can contain a list of items, and usually starts off with all the 
>>>>>> items 
>>>>>> in the left-hand box. Between the two boxes are two arrows, usually one 
>>>>>> on 
>>>>>> top of the other, one pointing to the right, one to the left. The 
>>>>>> left-hand 
>>>>>> box contains those items not 'chosen'; the right-hand box contains those 
>>>>>> chosen. To 'choose' items (that is, to move an item from the left-hand 
>>>>>> box 
>>>>>> to the right-hand box) one selects the item(s) (ctrl-click, shift-click, 
>>>>>> etc.) in the left-hand box, then presses the right-pointing arrow. The 
>>>>>> selected items move from the left-hand box to the right-hand box. To 
>>>>>> 'un-choose' items one selects items in the right-hand box, then presses 
>>>>>> the 
>>>>>> left-pointing arrow.
>>>>>>
>>>>>> 1. What is this widget usually called?
>>>>>>
>>>>>> 2. Does web2py have such a widget?
>>>>>>
>>>>>
>>>>>

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