How to add Next previous link in product page in Magento | Magento Source24

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use this bellow given code in your template file to  add Next previous link in product page in Magento

in this post we are coverd bellow line : 

1.  Do not show Previous and Next button if product is not in any category
2.  get all categories where the product is located in magento
3.  get all products from the category
4.  get position of current product
5.  get the next product url
6.  get the previous product url

<?php

if (!$_product->getCategoryIds())

    return; // Don’t show Previous and Next if product is not in any category

$cat_ids = $_product->getCategoryIds(); // get all categories where the product is located

$cat = Mage::getModel(‘catalog/category’)->load($cat_ids[0]); // load first category, you should enhance this, it works for me

$order = Mage::getStoreConfig(‘catalog/frontend/default_sort_by’);

$direction = 'asc'; // asc or desc

$category_products = $cat->getProductCollection()->addAttributeToSort($order, $direction);

$category_products->addAttributeToFilter(‘status ’, 1); // 1 or 2

$category_products->addAttributeToFilter(‘visibility ’, 4); // 1.2.3.4

$cat_prod_ids = $category_products->getAllIds(); // get all products from the category

$_product_id = $_product->getId();

$_pos = array_search($_product_id, $cat_prod_ids); // get position of current product

$_next_pos = $_pos + 1;

$_prev_pos = $_pos – 1;

// get the next product url

if (isset($cat_prod_ids[$_next_pos])) {

    $_next_prod = Mage::getModel(‘catalog/product’)->load($cat_prod_ids[$_next_pos]);

} else {

    $_next_prod = Mage::getModel(‘catalog/product’)->load(reset($cat_prod_ids));

}

// get the previous product url

if (isset($cat_prod_ids[$_prev_pos])) {

    $_prev_prod = Mage::getModel(‘catalog/product’)->load($cat_prod_ids[$_prev_pos]);

} else {

    $_prev_prod = Mage::getModel(‘catalog/product’)->load(end($cat_prod_ids));

}

?>

<?php if ($_prev_prod != NULL): ?>

    <a class=”pre-pro” href=”<?php print $_prev_prod->getUrlPath();

    if ($search_parameter): ?>?search=1<?php endif; ?>”><?php echo $this->__(‘previous product’) ?></a>

<?php endif; ?>

<?php if ($_next_prod != NULL): ?>

    <a class=”nex-pro” href=”<?php print $_next_prod->getUrlPath();

    if ($search_parameter): ?>?search=1<?php endif; ?>”><?php echo $this->__(‘Next product’) ?></a>

<?php endif; ?>