Polygrid columns not fully clearing when pgColumns is set

Paul Dupuis paul at researchware.com
Thu Aug 24 16:26:04 EDT 2023

Thanks Klaus.

I may use this method rather than the overhead of clearing and setting 
the whole pgData property.

Actually, the more I think about it, neither "method" should be needed. 
This is a polygrid bug. If you set the pgColumsn to fewer column, 
regardless of whether there is left over data in pgData, only the 
columns in the currently set pgColumns should be seen.

On 8/24/2023 2:34 PM, Klaus major-k via use-livecode wrote:
> Hi Paul,
>> Am 24.08.2023 um 20:30 schrieb Paul Dupuis via use-livecode <use-livecode at lists.runrev.com>:
>> Aha, I was setting pgColumns to the fewer columns and THEN pgData to the smaller data set to match the columns
>> You need to clear the pgData (set to empty) first, then set the columns, then set the new pgData.
>> Perhaps this is a documentation bug?
> I had success by setting the dgColumns to EMPTY first and later to the new "fewer" columns:
> ## Button "Fewer Columns"
> on mouseUp pMouseButton
>    local tColA, tDataA
>    local tSum
>    lock screen
>    ## !!
>    set the pgColumns of widget "myTable" to EMPTY
>   ## !!
>    put "rowname" into tColA[1]["name"]
> ...
>> On 8/24/2023 2:26 PM, Paul Dupuis via use-livecode wrote:
>>> Hi to any polygrid developers out there,
>>> Please see bug https://quality.livecode.com/show_bug.cgi?id=24315
>>> I have run into an issue with the latest polygrid (as of this post) where if you set pgColumns to a new array that reduces the number of columns in the grid, some old columns are not cleared, but instead are set to defaults (ie. the names revert to col5, col6, etc. instead of being completely removed
>>> Any thoughts to a work-around?
> Best
> Klaus
> --
> Klaus Major
> https://www.major-k.de
> https://www.major-k.de/bass
> klaus at major-k.de
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