[Yanel-dev] Parameters for search results pagination

[Bruno von Rotz]

Hmm, quick question: Do we actually know how many search results there 
are in total? How much effort is it to find this out, I mean machine 
time. Is there any performance impact of doing this this way?
For some application (i.e. ZG) simpler mechanisms may be sufficient.
Bruno

Mehmet Birgi schrieb:
> As discussed with Michi offline, we would like to mimic the search
> results pagination of Google for the Yanel search results, if this is
> feasible. So I had a look at how Google displays the results:
>
> Google displays 10 results per page as a default, this can be changed
> in the setting to the values "10, 20, 30 , 50, 100".
>
> Here is what Google displays on the bottom of the page after the first
> search and consecutive clicks on "Next" (with the current page in
> *bold*):
>
> 1)                                   *1* 2 3 4 5 6 7 8 9 10 Next
> 2)                        Previous 1 *2* 3 4 5 6 7 8 9 10 11 Next
> 3)                      Previous 1 2 *3* 4 5 6 7 8 9 10 11 12 Next
> 4)                    Previous 1 2 3 *4* 5 6 7 8 9 10 11 12 13 Next
> 5)                  Previous 1 2 3 4 *5* 6 7 8 9 10 11 12 13 14 Next
> 6)                Previous 1 2 3 4 5 *6* 7 8 9 10 11 12 13 14 15 Next
> 7)              Previous 1 2 3 4 5 6 *7* 8 9 10 11 12 13 14 15 16 Next
> 8)            Previous 1 2 3 4 5 6 7 *8* 9 10 11 12 13 14 15 16 17 Next
> 9)          Previous 1 2 3 4 5 6 7 8 *9* 10 11 12 13 14 15 16 17 18 Next
> 10)       Previous 1 2 3 4 5 6 7 8 9 *10* 11 12 13 14 15 16 17 18 19 Next
> 11)    Previous 1 2 3 4 5 6 7 8 9 10 *11* 12 13 14 15 16 17 18 19 20 Next
> 12)   Previous 2 3 4 5 6 7 8 9 10 11 *12* 13 14 15 16 17 18 19 20 21 Next
> 13)  Previous 3 4 5 6 7 8 9 10 11 12 *13* 14 15 16 17 18 19 20 21 22 Next
> 14) Previous 4 5 6 7 8 9 10 11 12 13 *14* 15 16 17 18 19 20 21 22 23 Next
>
> So, what Google is doing seems to be this:
>
> 1. Display link "Previous" if there is a previous page
> 2. Display links to up to 10 previous pages
> 3. Display the current page number in bold
> 4. Display links to up to 9 next pages
> 5. Display link "Next" if there is a next page
>
> To parametrize this behaviour, 2 parameters would be needed:
>
> * Number of entries to be displayed on a page (Google defaults to 10)
>
> * Number of pages to be linked to directly (Google always displays 20
> page numbers in the bottom, provided there are at least 20 pages of
> results; of those, the 10 previous and the 9 next pages are linked to)
>
> I suggest that we make both numbers configurable, while we set 10
> resp. 20 as defaults (like Google).
>
> This pagination feature can only work if the XSLT displaying these
> results supports the handling of the necessary parameters, so for
> backwards compatibility, the pagination feature will be disabled if
> none of thos parameters is supplied.
>
> If there are no objections to those design decisions, I will start the
> implementation in this direction.
>
> Cheers,
>
> Memo
>
>
>
>   


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