generate code 39 barcode in c# CREATING THE PRODUCT CATALOG: PART II in Visual C#.NET

Encoder Code-39 in Visual C#.NET CREATING THE PRODUCT CATALOG: PART II

CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
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{ /* If browsing a category, get the list of products by calling the GetProductsInCategory business tier method */ if (isset ($this->_mCategoryId)) $this->mProducts = Catalog::GetProductsInCategory( $this->_mCategoryId, $this->mPageNo, $this->mrHowManyPages); /* If browsing a department, get the list of products by calling the GetProductsOnDepartmentDisplay business tier method */ elseif (isset ($this->_mDepartmentId)) $this->mProducts = Catalog::GetProductsOnDepartmentDisplay( $this->_mDepartmentId, $this->mPageNo, $this->mrHowManyPages); /* If browsing the first page, get the list of products by calling the GetProductsOnCatalogDisplay business tier method */ else $this->mProducts = Catalog::GetProductsOnCatalogDisplay( $this->mPageNo, $this->mrHowManyPages); /* If there are subpages of products, display navigation controls */ if ($this->mrHowManyPages > 1) { // Read the query string $query_string = getenv('QUERY_STRING'); // Find if we have PageNo in the query string $pos = stripos($query_string, 'PageNo='); /* If there is no PageNo in the query string then we're on the first page */ if ($pos == false) { $query_string .= '&PageNo=1'; $pos = stripos($query_string, 'PageNo='); } // Read the current page number from the query string $temp = substr($query_string, $pos); sscanf($temp, 'PageNo=%d', $this->mPageNo); // Build the Next link if ($this->mPageNo >= $this->mrHowManyPages) $this->mNextLink = ''; else { $new_query_string = str_replace('PageNo=' . $this->mPageNo, 'PageNo=' . ($this->mPageNo + 1),
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CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
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$query_string); $this->mNextLink = 'index.php ' . $new_query_string; } // Build the Previous link if ($this->mPageNo == 1) $this->mPreviousLink = ''; else { $new_query_string = str_replace('PageNo=' . $this->mPageNo, 'PageNo=' . ($this->mPageNo - 1), $query_string); $this->mPreviousLink = 'index.php ' . $new_query_string; } } // Build links for product details pages $url = $_SESSION['page_link']; if (count($_GET) > 0) $url = $url . '&ProductID='; else $url = $url . ' ProductID='; for ($i = 0; $i < count($this->mProducts); $i++) { $this->mProducts[$i]['link'] = $url . $this->mProducts[$i]['product_id']; } } } > 5. Add the following code at the beginning of index.php, after the reference to app_top.php (app_top.php activates session handling, which is required for the following code to work). This code makes sure to always save the link to the current page if that page is not a product details page. In other words, $_SESSION['page_link'] will always contain the link to the last visited page which is not a product details page. You need to save this value to implement the Continue Shopping button in the product details page, which needs to forward the visitor to the previously visited page. < php // Load Smarty library and config files require_once 'include/app_top.php'; /* If not visiting a product page, save the link to the current page in the page_link session variable; it will be used to create the Continue Shopping link in the product details page and the links to product details pages */
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CHAPTER 4 CREATING THE PRODUCT CATALOG: PART II
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if (!isset ($_GET['ProductID'])) $_SESSION['page_link'] = substr(getenv('REQUEST_URI'), strrpos(getenv('REQUEST_URI'), '/') + 1, strlen(getenv('REQUEST_URI')) - 1); // Load Smarty template file $page = new Page(); 6. Open presentation/templates/department.tpl and replace <br /> Place list of products here with {include file="products_list.tpl"} 7. Load your project in your favorite browser, navigate to one of the departments, and then select a category from a department. Also, find a category with more than four products to test that the paging functionality works, as shown earlier in Figure 4-8.
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How It Works: The products_list Componentized Template
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Because most functionality regarding the products list has already been implemented in the data and business tiers, this task was fairly simple. The Smarty design template file (products_list.tpl) contains the layout to be used when displaying products, and its template plugin file (function.load_products_list.php) gets the correct list of products to display. The constructor in function.load_products_list.php (the ProductsList class) creates a new instance of the business tier object (Catalog) and retrieves DepartmentID, CategoryID, and PageNo from the query string, casting them to int as a security measure. These values are used to decide which products to display: // Class constructor public function __construct() { // Get DepartmentID from query string casting it to int if (isset ($_GET['DepartmentID'])) $this->_mDepartmentId = (int)$_GET['DepartmentID']; // Get CategoryID from query string casting it to int if (isset ($_GET['CategoryID'])) $this->_mCategoryId = (int)$_GET['CategoryID']; // Get PageNo from query string casting it to int if (isset ($_GET['PageNo'])) $this->mPageNo = (int)$_GET['PageNo']; else $this->mPageNo = 1; }
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