Wie implementiert man eine intelligente Paginierung für eine verbesserte Paginierungskontrolle?

Implementing Smart Pagination for Optimized Pagination Display

Pagination plays a crucial role in user navigation through large datasets by dividing content into manageable pages. However, traditional pagination can lead to extensive page lists for extensive datasets, making it difficult for users to navigate effectively.

To address this issue, a smart pagination algorithm can be implemented, which selectively shows only a few adjacent pages surrounding the current page. This truncation technique minimizes the length of the page list, enhancing the user experience by providing a more concise and manageable navigation.

In this demonstration, we'll focus on a PHP implementation of a smart pagination algorithm:

<code class="php">// Limit the number of adjacent pages
$adjacents = 3;

// Fetch data for the current page
// ... (Code snippet omitted for brevity)

// Calculate pagination information
$total_pages = ceil($total_results / $limit);
$prev = $page - 1;
$next = $page + 1;
$lastpage = $lastpage - 1;

// Initialize pagination HTML markup
$pagination = '<nav aria-label="page navigation"><ul class="pagination">';

// Determine page range to display based on current page and adjacent page limit
if ($lastpage < 7 + ($adjacents * 2)) {
    // Display all pages
    for ($i = 1; $i <= $lastpage; $i++) {
        $pagination .= "<li class='page-item" . ($i == $page ? ' active' : '') . "'><a class='page-link' href='?page=$i'>$i</a></li>";
    }
} else {
    // Display first and last pages
    $pagination .= "<li class='page-item'><a class='page-link' href='?page=1'>1</a></li>";
    $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>";
    $pagination .= "<li class='page-item'><a class='page-link' href='?page=$lastpage'>$lastpage</a></li>";

    // Display pages adjacent to the current page
    if ($page < 1 + ($adjacents * 2)) {
        // Display pages near the beginning
        for ($i = 1; $i < 4 + ($adjacents * 2); $i++) {
            $pagination .= "<li class='page-item" . ($i == $page ? ' active' : '') . "'><a class='page-link' href='?page=$i'>$i</a></li>";
        }
    } elseif ($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2)) {
        // Display pages in the middle
        $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>";
        for ($i = $page - $adjacents; $i <= $page + $adjacents; $i++) {
            $pagination .= "<li class='page-item" . ($i == $page ? ' active' : '') . "'><a class='page-link' href='?page=$i'>$i</a></li>";
        }
    } else {
        // Display pages near the end
        $pagination .= "<li class='page-item disabled'><span class='page-link'>...</span></li>";
        for ($i = $lastpage - (2 + ($adjacents * 2)); $i <= $lastpage; $i++) {
            $pagination .= "<li class='page-item" . ($i == $page ? ' active' : '') . "'><a class='page-link' href='?page=$i'>$i</a></li>";
        }
    }
}

// Display previous and next page links
if ($page != 1) {
    $pagination .= "<li class='page-item'><a class='page-link' href='?page=$prev'>Previous</a></li>";
}
if ($page != $lastpage) {
    $pagination .= "<li class='page-item'><a class='page-link' href='?page=$next'>Next</a></li>";
}

// Output pagination HTML
echo $pagination . '</ul></nav>';</code>

This implementation uses a combination of loops and conditional statements to determine which pages to display based on the current page and the defined adjacent page limit. It also handles edge cases such as the first or last page and adjusts the pagination display accordingly. By leveraging this smart pagination algorithm, you can provide a more streamlined and user-friendly pagination experience for extensive datasets.

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