* widget-create 'menu-choice
@ 2009-09-18 18:54 Mortimer Cladwell
2009-09-22 2:28 ` Kevin Rodgers
2009-09-24 17:31 ` Andreas Politz
0 siblings, 2 replies; 5+ messages in thread
From: Mortimer Cladwell @ 2009-09-18 18:54 UTC (permalink / raw
To: help-gnu-emacs
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Hi,
I would like to dynamically populate a dropdown widget from a database. the 'menu-choice widget looks like
(widget-create 'menu-choice
:tag "Select Host Species"
:value "unknown"
:notify (lambda (widget &rest ignore)
(setq host-species (widget-value widget)))
'(item "human")
'(item "rat")
'(item "mouse"))
Suppose I can generate a list '( "human "rat" "mouse") from the database. How to create
'(item "human")
'(item "rat")
'(item "mouse")
on the fly? The closest I can come is
(progn
(setq var '( "human" "rat" "mouse"))
(mapcar '(lambda (a) `'(item ,a)) var)
)
Thanks
Mortimer
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: widget-create 'menu-choice
2009-09-18 18:54 widget-create 'menu-choice Mortimer Cladwell
@ 2009-09-22 2:28 ` Kevin Rodgers
2009-09-24 17:31 ` Andreas Politz
1 sibling, 0 replies; 5+ messages in thread
From: Kevin Rodgers @ 2009-09-22 2:28 UTC (permalink / raw
To: help-gnu-emacs
Mortimer Cladwell wrote:
> Hi,
>
> I would like to dynamically populate a dropdown widget from a database.
> the 'menu-choice widget looks like
>
> (widget-create 'menu-choice
> :tag "Select Host Species"
> :value "unknown"
> :notify (lambda (widget &rest ignore)
> (setq host-species (widget-value widget)))
> '(item "human")
> '(item "rat")
> '(item "mouse"))
> Suppose I can generate a list '( "human "rat" "mouse") from the
> database. How to create
>
> '(item "human")
> '(item "rat")
> '(item "mouse")
>
> on the fly? The closest I can come is
>
> (progn
> (setq var '( "human" "rat" "mouse"))
> (mapcar '(lambda (a) `'(item ,a)) var)
> )
i.e.
(let ((var '("human" "rat" "mouse")))
(mapcar (lambda (label) (list 'item label))
var))
--
Kevin Rodgers
Denver, Colorado, USA
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: widget-create 'menu-choice
2009-09-18 18:54 widget-create 'menu-choice Mortimer Cladwell
2009-09-22 2:28 ` Kevin Rodgers
@ 2009-09-24 17:31 ` Andreas Politz
1 sibling, 0 replies; 5+ messages in thread
From: Andreas Politz @ 2009-09-24 17:31 UTC (permalink / raw
To: help-gnu-emacs
Mortimer Cladwell <mbcladwell@yahoo.com> writes:
> Hi,
>
> I would like to dynamically populate a dropdown widget from a
> database. the 'menu-choice widget looks like
>
> (widget-create 'menu-choice
> :tag "Select Host Species"
> :value "unknown"
> :notify (lambda (widget &rest ignore)
> (setq host-species (widget-value
> widget)))
> '(item "human")
> '(item "rat")
> '(item "mouse"))
> Suppose I can generate a list '( "human "rat" "mouse") from the
> database. How to create
>
> '(item "human")
> '(item "rat")
> '(item "mouse")
>
> on the fly? The closest I can come is
>
> (progn
> (setq var '( "human" "rat" "mouse"))
> (mapcar '(lambda (a) `'(item ,a)) var)
> )
> Thanks
>
> Mortimer
`apply' solves this problem.
(apply #'* 1 2 3 '(4 5))
-ap
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: widget-create 'menu-choice
2009-09-24 16:13 Mortimer Cladwell
@ 2009-09-25 2:59 ` Kevin Rodgers
0 siblings, 0 replies; 5+ messages in thread
From: Kevin Rodgers @ 2009-09-25 2:59 UTC (permalink / raw
To: help-gnu-emacs
Mortimer Cladwell wrote:
> Your suggestion evaluates to:
>
> ((item "human") (item "rat") (item "mouse"))
>
> which when inserted into a form results in the error:
>
> widget-create: Invalid function: (item "human")
Ah, I misread the widget-create arguments. That function's doc string is
practically useless.
> Evaluations that would work are:
>
> '(item "human") '(item "rat") '(item "mouse")
> OR
>
> (quote (item "human")) (quote (item "rat")) (quote (item "mouse"))
>
> Note that there are no enclosing parenthesis around the list.
As Andreas points out, you need apply:
(defvar species '("human" "rat" "mouse"))
(apply 'widget-create
'menu-choice
:tag "Select Host Species"
:value "unknown"
:notify (lambda (widget &rest ignore)
(setq host-species (widget-value widget)))
(mapcar (lambda (label) (list 'item label))
species))
--
Kevin Rodgers
Denver, Colorado, USA
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: widget-create 'menu-choice
@ 2009-09-26 21:52 Mortimer Cladwell
0 siblings, 0 replies; 5+ messages in thread
From: Mortimer Cladwell @ 2009-09-26 21:52 UTC (permalink / raw
To: help-gnu-emacs
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(apply 'widget-create 'menu-choice....
Will create multiple dropdown lists. I want a single dropdown that has
multiple elements. I am thinking a macro is the way to go. Consider:
(defmacro item-element (var)
(list 'quote `'(item ,var)))
Then (item-element "human") would evaluate to (quote (item "human"))
What I haven't been able to do is mapcar item-element over my list
("rat" "human" "mouse")
The desired output is:
(quote (item "rat")) (quote (item "human")) (quote (item "mouse"))
Note the absence of circumscribed parenthesis, i.e. this is not a list.
Suggestions?
Thanks
Mortimer
----------------------------------------------------------
Mortimer Cladwell wrote:
Your suggestion evaluates to:
>>
>((item "human") (item "rat") (item "mouse"))
>>
>which when inserted into a form results in the error:
>>
>widget-create: Invalid function: (item "human")
>
Ah, I misread the widget-create arguments. That function's doc string is
practically useless.
Evaluations that would work are:
>>
>'(item "human") '(item "rat") '(item "mouse")
>>OR
>
>(quote (item "human")) (quote (item "rat")) (quote (item "mouse"))
>>
Note that there are no enclosing parenthesis around the list.
>
As Andreas points out, you need apply:
(defvar species '("human" "rat" "mouse"))
(apply 'widget-create 'menu-choice :tag "Select Host Species" :value "unknown" :notify (lambda (widget &rest ignore) (setq host-species (widget-value widget))) (mapcar (lambda (label) (list 'item label)) species))
--
Kevin Rodgers
Denver, Colorado, USA
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end of thread, other threads:[~2009-09-26 21:52 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2009-09-18 18:54 widget-create 'menu-choice Mortimer Cladwell
2009-09-22 2:28 ` Kevin Rodgers
2009-09-24 17:31 ` Andreas Politz
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2009-09-24 16:13 Mortimer Cladwell
2009-09-25 2:59 ` Kevin Rodgers
2009-09-26 21:52 Mortimer Cladwell
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