I think adding support for multiple select is pretty simple. As a quick
experiment you could create a variant of jhselect that added the word
multiple in the html. Not sure of the details,but something like:
<select multiple ....> instead of the <select ...>
If this works in the sense that it gives you the gui you want, then you
then need to figure out how the events are triggered for multiple selection
but I don't think that would be too hard.
On Wed, Dec 14, 2011 at 11:29 AM, Ian Clark <earthspo...@gmail.com> wrote:
> Thanks, Eric.
>
> I guess I was trawling for a simple-stupid answer, to save doing it
> the hard way.
>
> I'd thought of a table of checkboxes, but since the list to be checked
> is scrollable (and individual items can be hidden) it's not so
> straightforward.
>
> Fortunately, in this particular instance, it's easy to arrange for the
> engine which governs the list to accumulate selections, and flag them
> with stars, so that's the way I'll go. It demands nothing clever from
> the gui, which IME is always a good idea for a portable app.
>
> On Wed, Dec 14, 2011 at 2:59 PM, Eric Iverson <eric.b.iver...@gmail.com>
> wrote:
> > There is a "select multiple" html tag. You'll have to dig into the html
> and
> > javascript docs on this and provide new jhs wrappers to make it easy to
> use
> > from J. I think the code will be trivial but the homework to figure out
> the
> > code will be more difficult. Depending on the app requirements a table of
> > checkboxes is another way to go (see jal for an example of this).
> >
> > On Wed, Dec 14, 2011 at 3:24 AM, Ian Clark <earthspo...@gmail.com>
> wrote:
> >
> >> Trying to port a j6 jwd app to j7 jhs. It has a listbox accepting
> >> multiple selections, defined like this:
> >>
> >> xywh 5 16 244 100;cc panel listbox ws_vscroll lbs_multiplesel
> >> rightmove bottommove;
> >>
> >> The JHS framework offers a verb: jhselect to generate a Select object,
> >> which IMO is the thing to use in its place. But it only allows single
> >> lines to be selected.
> >>
> >> How do I get multiple selections, *plus* reading back what lines are
> >> selected?
> >>
> >> If I define a variant (the only difference from jhselect being that
> >> I've inserted 'multiple' in line 1) ...
> >>
> >> jhselectmultiple=: 4 : 0
> >> 'values size sel'=. y
> >> t=. '<select id="<ID>" name="<ID>" class="jhselect" size="<SIZE>"
> >> multiple onchange="return jev(event)" >'
> >> t=. t hrplc 'ID SIZE SEL';x;size;sel
> >> opt=. '<option value="<VALUE>" label="<VALUE>"
> <SELECTED>><VALUE></option>'
> >> for_i. i.#values do.
> >> t=. t,opt hrplc'VALUE
> >> SELECTED';(i{values),(i=sel){'';'selected="selected"'
> >> end.
> >> t=. t,'</select>'
> >> )
> >>
> >> and call it in HBS with a line like this:
> >>
> >> 'sel' jhselectmultiple sel_text ; sel_size ; sel_index
> >>
> >> then this does indeed generate a Select object with id="sel" which
> >> accepts multiple selections.
> >>
> >> However, I can only see the first selection, using this javascript
> >> function (borrowed from jdemo4):
> >>
> >> function ev_sel_change()
> >> {
> >> jbyid("which").innerHTML= JEV+" : "+jbyid("selm").selectedIndex;
> >> }
> >>
> >> I don't know the DOM well enough to know what I should be using instead.
> >>
> >> I've tried googling for selectedIndex and get this link:
> >> http://www.javascriptkit.com/jsref/select.shtml
> >> but it merely confirms that the above is the behavior of selectIndex
> >> when 'multiple' is specified, without suggesting what to use instead.
> >>
> >> (Does anyone know a better DOM reference link?)
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