标准分页会生成看似无穷无尽的页面列表,但可以通过仅显示特定内容来优化此过程与当前页面相邻的页面。这可以防止页面列表过长,使用户更容易导航分页系统。
实现这种“智能”分页策略的一种方法是修改现有分页代码以截断显示页面的列表,同时保持功能。修改后的算法应包含以下步骤:
如果页数超过阈值,则分析当前页面在分页系统中的位置:
以下是智能分页算法的 PHP 实现示例:
<code class="php">// Set adjacent page count $adjacents = 3; // Initialize page number and items per page $page = (int)$_GET["page"] ?? 1; $limit = 5; // Calculate start item $start = ($page - 1) * $limit; // Fetch data $data = $db->query("SELECT * FROM mytable LIMIT $start, $limit")->fetchAll(); // Calculate total pages $total_pages = count($data); // Set up page variables $prev = $page - 1; $next = $page + 1; $lastpage = ceil($total_pages / $limit); $lpm1 = $lastpage - 1; // Generate pagination HTML $pagination = "<nav aria-label='page navigation'><ul class='pagination'>"; // Previous button $disabled = ($page === 1) ? "disabled" : ""; $pagination .= "<li class='page-item $disabled'><a class='page-link' href='?page=$prev'>« previous</a></li>"; // Pages // Too few pages to hide any if ($lastpage < 7 + ($adjacents * 2)) { for ($i = 1; $i <= $lastpage; $i++) { $active = ($i === $page) ? "active" : ""; $pagination .= "<li class='page-item $active'><a class='page-link' href='?page=$i'>$i</a></li>"; } } elseif ($lastpage > 5 + ($adjacents * 2)) { // Close to beginning if ($page < 1 + ($adjacents * 2)) { for ($i = 1; $i < 4 + ($adjacents * 2); $i++) { $active = ($i === $page) ? "active" : ""; $pagination .= "<li class='page-item $active'><a class='page-link' href='?page=$i'>$i</a></li>"; } $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>"; $pagination .= $last_pages; } elseif ($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2)) { // In middle $pagination .= $first_pages; $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>"; for ($i = $page - $adjacents; $i <= $page + $adjacents; $i++) { $active = ($i === $page) ? "active" : ""; $pagination .= "<li class='page-item $active'><a class='page-link' href='?page=$i'>$i</a></li>"; } $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>"; $pagination .= $last_pages; } else { // Close to end $pagination .= $first_pages; $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>"; for ($i = $lastpage - (2 + ($adjacents * 2)); $i <= $lastpage; $i++) { $active = ($i === $page) ? "active" : ""; $pagination .= "<li class='page-item $active'><a class='page-link' href='?page=$i'>$i</a></li>"; } } } // Next button $disabled = ($page === $lastpage) ? "disabled" : ""; $pagination .= "<li class='page-item $disabled'><a class='page-link' href='?page=$next'>next »</a></li>"; $pagination .= "</ul></nav>"; if ($lastpage <= 1) { $pagination = ""; } echo $pagination; foreach ($data as $row) { // Display your data } echo $pagination;</code>
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