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Re: Manually culling a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115146] Re: Manually culling a list
  • From: Mike H <mike.honeychurch at gmail.com>
  • Date: Sun, 2 Jan 2011 04:56:42 -0500 (EST)

On Sun, Jan 2, 2011 at 5:11 AM, DrMajorBob <btreat1 at austin.rr.com> wrote:

> That fails (AS DESCRIBED):
>
> list = CharacterRange["A", "F"];
> CheckboxBar[Dynamic[x], list]
> list[[x]]
>
> {"A", "B", "C", "D", "E", "F"}[[{"A", "D", "F"}]]
>
> Part::pspec: Part specification {A,D,F} is neither an integer nor a list of
> integers. >>
>
> But success is hidden within:
>
> x
>
> {"A", "D", "F"}
>
> Documentation includes the simple example
>
> {CheckboxBar[Dynamic[x], {1, 2, 3}], Dynamic[x]}
>
> and this is also interesting:
>
> {TogglerBar[Dynamic[y], Range[5]], Dynamic[y]}
>
> In both cases, elements are added to x in the order that check-marks are
> added.
>
> Bobby
>


Yes when I posted I left out a line that makes the rules. I sent another
post about a minute later, you'll find it in this thread.

Note that a shortcoming of CheckboxBar is using it for large numbers of
checkboxes -- you have to break up the bar to fit it on the page (both
horizontally or vertically) and get nice alignment. Appearance->"Row" is not
really a realistic aesthetic option for commercial work.  It is possible to
write some code to make a CheckBoxGrid -- several smaller checkbox bars
nicely aligned -- but this functionality probably needs to be built-in in
the next version.

Mike



>
> On Sat, 01 Jan 2011 03:24:28 -0600, Armand Tamzarian <
> mike.honeychurch at gmail.com> wrote:
>
>  On Dec 30 2010, 8:10 pm, ntg <ntgl... at gmail.com> wrote:
>>
>>> Hello guys,
>>>
>>> Suppose I have a longish list of items that I want to manually cull.
>>> It seems I should be able to do something like
>>>
>>> checkList = ({Checkbox[], #)& /@ list
>>>
>>> Then, I could write
>>>
>>> instanceOfCheckList = checkList
>>>
>>> check away, and hopefully see something like
>>>
>>> {{True, item1}, {False, item2}, ...}
>>>
>>> which I could manipulate. But all I see is the the list of "checked"
>>> checkboxs and items, not the consequence of checking the boxes. I can
>>> do a FullForm on instanceOfCheckList and extract what I need via list
>>> surgery-- but that is inelegant. I'm sure there is some magic
>>> incantation involving Evaluate or Interpretation or Dynamic. Can you
>>> help?
>>>
>>> Thanks,
>>> Tom
>>>
>>
>>
>> It looks to me like CheckboxBar is what you need.
>>
>> CheckboxBar[Dynamic[x], list]
>>
>> then make your manual selections, then to recover your selections:
>>
>> list[[x]]
>>
>> Note that on a Mac CheckboxBar has a formatting issue when you display
>> it vertically (WRI tech support have logged this bug) the labels, if
>> you have word labels, do no align very well with the check box.
>>
>> Mike
>>
>>
>
> --
> DrMajorBob at yahoo.com
>


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