[Seaside] JQSortable with LI that I do not render myself

Mariano Martinez Peck marianopeck at gmail.com
Thu Jan 22 15:13:59 UTC 2015

On Sat, Jan 17, 2015 at 6:26 AM, Johan Brichau <johan at inceptive.be> wrote:

> Hi Mariano,
> My first question is why are you using the bootstrap select to render a
> list of items? If it’s not a select that you want but a sortable list, why
> not generate it immediately?

Hi Johan,

Good question. Originally I was using plain HMTL selects. Then it become a
requirement to also have a kind of multi-selection list but not that one
that looks like a area and that uses a lot of height space. The ideal was a
kind of dropdown list with multiselect support. And finally, if that would
be sortable, that would be even cooler because we also needed that. We were
already using http://silviomoreto.github.io/bootstrap-select/  because it
makes lists nicer. And then I found out that such a lib also supports
multiselection and filtering. I just needed to add sorting. Then...all my
previous code that I had using lists... could be very easily updated to use

> The bootstrap plugin is generating the html based on the html you
> generated in Seaside.
> In this client-side conversion step, the ids and scripts generated from
> Seaside are not (or cannot be) copied.
> You need options in the plugin to pass callbacks. I took a quick look but
> I don’t see any.
> If there are such options (there exist other such plugins), it still is a
> lot of fiddling on the client-side to hook up the right js callbacks to
> server-side callbacks, especially if you have more than one select to
> handle.

Indeed, I searched for callbacks too in the lib....

> But there’s probably a good reason you are trying to do this. If that’s
> the case, I would try to use event delegation and put event handlers on the
> parent element of the select.
> The plugin is probably generating the li right next to existing select but
> with the same parent. If that is the case, you can put jQuery event
> handlers on that parent element (which you generate from Seaside.
> Something like:
> html div
> script: (html jQuery this) on: ‘click’ do: (html jQuery ajax callback:[ …
> ])
>        with: [ self renderSelectOn: html ]
> It probably will require some more complex handling with respect to
> getting the correct events sorted out…
> I did not try these things, so I hope this helps

That's something I didn't think about. Thanks for sharing.

That being said...I did find a "workaround" (or hack?) that did work...I
will share it in case someone finds it useful.

1) First I render the html select and I apply the bootstrap lib (from here
http://silviomoreto.github.io/bootstrap-select/), setting the
mutliselection option and the filter capability.

2) Then, this hack:

"this is a hack because Bootstrap-select does not set an ID to the LI
elements and I need those in order to associate
passengers to my target objects for the events. "
html script: '
*($(''#', select id, ''').parent().find(''.inner li'')).each(function(i,
item) {*
*   $(this).attr(''id'', ''', select id, '_'' +
($(item).attr(''data-original-index'')) );*
* });*
* '.*

Basically....I manually assign an ID to each generated LI.

3) Then....another hack:

"This is another hack because I DO NOT render myself each LI element but
instead it is automaticallty done by
Bootstrap-select from our html select. So....I must explicitly register a
passenger for each LI"
*self availableListInOrder doWithIndex: [ :each :index | *
* html callbacks registerPassenger: each named: (select id, '_', (index-1)
asString) ].*
Basically...I register my objects as passengers at the IDs I have just
assigned above.

Then...for the sorting feature, I do something like this:

html script:  (((html jQuery id: select id) parent find: '.inner')
* sortable*
* onBeforeStop: (html jQuery ajax*
* callback: [ :values | *
* self availableListInOrder: values.*
* self reSortListSelectedWith: values.*
* ]*
*                  passengers: (((html jQuery id: select id) parent find:
'.inner') find: 'li')*


Here the magic is to use #callback:passengers:

And the same must be used for the onChange: of the select list:

*onChange:  *
*                (html jQuery ajax*
* serializeForm;*
*       script: [ :s |  *
* self listChangeCallback ifNotNilDo: [ :aBlock | aBlock value: s ].*
* self reRenderEditorScriptUsing: s.*
* ];*
* callback: [ :values | self setSelectedItemsBlock value: values ]*
*     passengers: ((((html jQuery id: select id) parent find: '.inner')
find: 'li') filter: '.selected') *

So...it's kind of a black magic I think...but I encapsulated everything in
a MultiSelectionComponent where I can hook everything so it works nicely.

Too much hacky?

> cheers,
> Johan
> On 16 Jan 2015, at 16:54, Mariano Martinez Peck <marianopeck at gmail.com>
> wrote:
> Hi guys,
> I have a html select list that then I convert to a UL / LI kind of list
> using Bootstrap select: https://github.com/silviomoreto/bootstrap-select
> I want to make it sortable (which I could) but I cannot correctly hook
> onto the stop of the drop so that I can update my model/backend side.
> I am trying to do something like:
> html script:  ((html jQuery id: '#myULList')
>  sortable
> onStop: (html jQuery ajax
>                     callback: [ :values | values asOrderedCollection
> inspect ]
>                     passengers: (html jQuery this find: 'li')))
> Basically...I need to get 'values' with my real objects. The problem is
> that since I am not rendering the LI items myself (but bootstrap select
> does), I cannot specify the passenger..I mean...I cannot do something like
> "html listItem passenger: each"  or whatever...
> Any ideas how can I make it work?
> Thanks in advance,
> --
> Mariano
> http://marianopeck.wordpress.com
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