Question

<< 1 2 3 4 … 15 16 17 … 47 48 49 50 >>

<< 1 2 3 4 5 6 7 … 47 48 49 50 >>

<< 1 2 3 4 … 44 45 46 47 48 49 50 >>

(the bold is the selected page)

Is there any cleaver logic out there that creates scaling pagination like this? I have created one of these before but it ended up as a mess of logic statements.

The language i am doing this in now is PHP but if you have examples or tips for any language, it would be appreciated.

By scaling i mean when there are only a few pages. The pagination displays this.

<< 1 2 3 4 5 6 7 >>

As the number of pages grow to a certain point, the pagination stops showing all numbers and starts splitting them up.

<< 1 2 3 4 … 47 48 49 50 >>

<< 1 2 3 4 5 6 … 47 48 49 50 >>

<< 1 2 3 4 5 6 7 8 … 47 48 49 50 >>

<< 1 2 3 4 .. 7 8 9 … 47 48 49 50 >>

<< 1 2 3 4 .. 15 16 17 … 47 48 49 50 >>

<< 1 2 3 4 … 44 45 46 47 48 49 50 >>

<< 1 2 3 4 … 47 48 49 50 >>

(note, the actual numbers and how many it shows before and after is not relevant)

Answer 1

Sorry for the blob of code but here goes. Hopefully the comments are enough to tell you how it works – if leave a comment and I might add some more.

    /**      * Get a spread of pages, for when there are too many to list in a single <select>      * Adapted from phpMyAdmin common.lib.php PMA_pageselector function      *      * @param integer total number of items      * @param integer the current page      * @param integer the total number of pages      * @param integer the number of pages below which all pages should be listed      * @param integer the number of pages to show at the start      * @param integer the number of pages to show at the end      * @param integer how often to show pages, as a percentage      * @param integer the number to show around the current page      */     protected function pages($rows, $pageNow = 1, $nbTotalPage = 1, $showAll = 200, $sliceStart = 5, $sliceEnd = 5, $percent = 20, $range = 10)     {         if ($nbTotalPage < $showAll)             return range(1, $nbTotalPage);          // Always show the first $sliceStart pages         $pages = range(1, $sliceStart);          // Always show last $sliceStart pages         for ($i = $nbTotalPage - $sliceEnd; $i <= $nbTotalPage; $i++)             $pages[] = $i;          $i = $sliceStart;         $x = $nbTotalPage - $sliceEnd;         $met_boundary = false;         while ($i <= $x)         {             if ($i >= ($pageNow - $range) && $i <= ($pageNow + $range))             {                 // If our pageselector comes near the current page, we use 1                 // counter increments                 $i++;                 $met_boundary = true;             }             else             {                 // We add the percentate increment to our current page to                 // hop to the next one in range                 $i = $i + floor($nbTotalPage / $percent);                  // Make sure that we do not cross our boundaries.                 if ($i > ($pageNow - $range) && !$met_boundary)                   $i = $pageNow - $range;             }              if ($i > 0 && $i <= $x)                 $pages[] = $i;         }          // Since because of ellipsing of the current page some numbers may be double,         // we unify our array:         sort($pages);         return array_unique($pages);     }