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When developing web applications, you often meet with the requirement to print out a restricted number of records on a page. However, mathematics behind pagination can be tricky and that's why you should use Nette\Utils\Paginator.

We instantiate the paginator and set the object's properties like: a number of records per page, the number of current page and the total number of records if it is known.

$paginator = new Nette\Utils\Paginator;
$paginator->setItemCount(356); // the total number of records (e.g., a number of products)
$paginator->setItemsPerPage(30); // the number of records on page
$paginator->setPage(1); // the number of the current page (numbered from one)

The object can be passed to a template and after that we can ask clear questions

if ($paginator->first) ... // is this the first page?
if ($paginator->last) ... // is this the last page?
echo $paginator->page; // current page number

We use the paginator in formulation of a SQL query. Methods getLength() and getOffset() return values used in the clauses LIMIT and OFFSET.

$result = $database->table('products')
	->limit($paginator->getLength(), $paginator->getOffset());

If you need pages in reverse order (i.e., the page no. 1 corresponds with the highest offset), you may replace the method getOffset() with getCountdownOffset().