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Re: Reversing the rows of a table ??

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Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> wrote on 04 mrt
2014 in comp.lang.javascript: 

> On Mon, 3 Mar 2014 18:51:11 -0800 (PST), Michael Haufe (TNO)
> wrote:
> 
>>On Monday, March 3, 2014 6:31:53 PM UTC-6, Mel Smith wrote:
> 
>>> Michael said:
> 
>>> > You want to reverse the rows before you have all the rows?
>>[...] 
>>>     No, after the table is completely loaded, then I wish to hide the
>>>     table, 
>>> reverse the rows, then show the table
> 
>>One approach is to create a second tbody in the table and then copy/move
>>the old rows from the bottom up into the new tbody and then remove the
>>old tbody when complete. 
>>
>><https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableElement>
>>
>>Evertjan is correct though that it would be wiser to populate a
>>different data structure and then reverse it there before populating the
>>table. 
> 
> I do not quite see why it would be wiser or even better. For any
> but a very big table it does not matter how you do it.
> 
> Stuffing the rows into a second tbody is one nice way to do it,
> but it is not much more difficult to swap them around in the
> same tbody.
> 
> I sometimes do this to allow the user to sort the table in
> different ways by clicking on the header of the sort column.

That was not in the OQ specs.
That was a clientside row inversion at onload time,
where the table was held or made invisible till reversed.

> Because you have plenty of processor power on a typical
> computer, you can use a very simple algorithm like bubble sort,
> and it is still instantaneous even for moderately large tables.

A bubble sort does not inverse, 
it is like an bubble-bath where you just want a glass of cold water. 

Not my definition of 'instantaneous'.

> This is, of course, much better than doing it server-side,

My old math-teacher warned me for any 'of course' in a reasoning argument,
such being suggestive of the possibility that the speaker did not ...
[suppressed].

> because it reduces server load, data transfer load, and user
> time without having any disadvantage.

No it does not, because:

1 the server load remains the same if properly 'order by'-ed. The OP implied 
that the database action was lengthy anyway, methinks.

2 user time is better when the html is seen as is, and the teble is not made 
invisible till the reveral is finished.

3 data transfer is marginally smaller as the script lines are not 
transfered. 

4 What about "javascript switched off" disadvantage,
serverside javascript cannot be switched of by the user. 

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Reversing the rows of a table ?? "Mel Smith" <med_cutout_syntel@aol.com> - 2014-03-03 16:57 -0700
  Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 01:15 +0100
  Re: Reversing the rows of a table ?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-03-03 16:19 -0800
    Re: Reversing the rows of a table ?? "Mel Smith" <med_cutout_syntel@aol.com> - 2014-03-03 17:31 -0700
      Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 01:36 +0100
      Re: Reversing the rows of a table ?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-03-03 18:51 -0800
        Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 08:57 +0100
        Re: Reversing the rows of a table ?? Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2014-03-04 09:13 +0100
          Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 09:49 +0100
        Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-04 12:16 +0100
          Re: Reversing the rows of a table ?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-03-04 06:37 -0800
            Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-04 15:56 +0100
              Re: Reversing the rows of a table ?? "Mel Smith" <med_cutout_syntel@aol.com> - 2014-03-04 09:10 -0700
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-04 17:56 +0100
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 21:47 +0100
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 22:38 +0100
                Re: Reversing the rows of a table ?? "Mel Smith" <med_cutout_syntel@aol.com> - 2014-03-04 15:46 -0700
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-05 00:18 +0100
                Re: Reversing the rows of a table ?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-03-04 16:17 -0800
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-05 09:06 +0100
                Re: Reversing the rows of a table ?? Christoph Michael Becker <cmbecker69@arcor.de> - 2014-03-05 17:49 +0100
                Re: Reversing the rows of a table ?? Christian Winter <thepoet_nospam@arcor.de> - 2014-03-05 06:50 +0100
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-05 09:07 +0100
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-05 16:42 +0100
                Re: Reversing the rows of a table ?? Christian Winter <thepoet_nospam@arcor.de> - 2014-03-06 07:28 +0100
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-06 10:58 +0100
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-06 11:11 +0100
                Re: Reversing the rows of a table ?? Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-03-06 10:35 -0300
              Re: Reversing the rows of a table ?? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-03-04 11:06 -0800
                Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-04 20:22 +0100
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-04 20:55 +0100
  Re: Reversing the rows of a table ?? ompalompasales2@gmail.com - 2014-03-04 12:59 -0800
  Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-05 23:05 +0100
    Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-05 23:42 +0100
      Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 14:57 +0100
        Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-06 22:37 +0100
          Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 23:04 +0100
            Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-06 23:20 +0100
              Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 23:31 +0100
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-07 00:30 +0100
                Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-07 18:10 +0100
                Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-07 22:49 +0100
            Re: Reversing the rows of a table ?? Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-03-06 19:21 -0300
              Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 23:41 +0100
                Re: Reversing the rows of a table ?? Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-03-06 22:45 -0300
    Re: Reversing the rows of a table ?? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-03-05 23:47 +0100
      Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 14:57 +0100
    Re: Reversing the rows of a table ?? Denis McMahon <denismfmcmahon@gmail.com> - 2014-03-05 23:41 +0000
    Re: Reversing the rows of a table ?? Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-03-06 18:56 -0300
      Re: Reversing the rows of a table ?? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2014-03-06 23:18 +0100
        Re: Reversing the rows of a table ?? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-03-06 23:24 +0100

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