Most spiders will easily recognise that the page is 1) dynamic, and 2)
already visited.
If you're worried about DOS attacks, you may want to look at server
filtering rather than application level nofollows.
As gandalfu said, there's no need to store anything in the session,
although you could do to save the sorting order if the user leaves
this particular action cycle.
Here's a tip... create a module using the admin generator, then take a
look at the generated code in the cache. The admin generated code
already does pretty-much what you are looking for. In your template,
check the pager object to see which column is being sorted, and in
which direction.
A simple IF and SWITCH would work quite easily, Here's some
pseudocode:
if($pager's sort column === current column)
{
switch ($pager's sort direction){
case: asc then echo descending link_to
case: desc then echo reset link_to
default: then echo ascending link_to
}case,
} else {
echo ascending link_to;
}
Put that in a partial, and pass the partial the current column header
to be rendered. Check out the admin-generate modules for a nice way to
handle query generation and sorting generation (and also, filter
generation).
Also, then add the XML output for this, and you can attach nifty ajax
based table sorts ontop of your standard HTML sorts.
That gives you best-practice. HTML output that allows sorting, XML
output that can be sorted / filtered, and AJAX functionality attached
to that.
Good luck!
On Jan 13, 11:13 am, Lee Bolding <[email protected]> wrote:
> On 13 Jan 2009, at 10:49, [email protected] wrote:
>
>
>
> > There is no need to store anything on the user session.
>
> > Since you are reloading the page, you can regenerate the parameters yo
> > pass when the user clics the header. first time you clic a header, you
> > reload the page and add a (ASC) next to the label, next time a DESC,
> > next time nothing.... and the correct urls parameters.
>
> True, but using a session may save you from a DOS attack when a spider
> reaches the site... unless you also add nofollow links to each
> generated URL.
>
> Either way would work fine. Each has their own set of pro's and con's.
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