c# create code 39 barcode CATALOG ADMINISTRATION in C#

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CHAPTER 7 CATALOG ADMINISTRATION
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Figure 7-11. The admin_categories componentized template
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How It Works: Administering Categories and Products
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This time, we chose to quickly show you how to add the new functionality. We did this because the code for administering categories and products follows the same patterns as the code for administering departments. Have a close look at the new code that you added to make sure you understand exactly how it works before moving on to administering product details.
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Administering Product Details
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The products list you built earlier is wonderful, but it lacks a few important features. The final componentized template you re implementing, admin_product, enables you to View the product s picture. Remove the product from a category. Remove the product from the database completely. Assign the current product to an additional category. Move the current product to another category. When it comes to product removal, things aren t so straightforward. You can either unassign the product from a category by removing the record from the product_category table, or you can effectively remove the product from the product table. Because products are accessed in the catalog by selecting a category, you must make sure there are no orphaned products (products that don t belong to any category) because they couldn t be accessed using the current administration interface.
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CHAPTER 7 CATALOG ADMINISTRATION
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So, if you added a Delete button for a product, what would it actually do Delete the product from the database This would work, but it s a bit awkward if you have a product assigned to multiple categories, and you only want to remove it from a single category. On the other hand, if the Delete button removes the product from the current category, you can create orphaned products because they exist in the product table, but they don t belong to any category, so they can t be accessed. You could fix that by allowing the site administrator to see the complete list of products without locating them by department and category. The simple solution implemented in this chapter is like that. There will be two delete buttons: a Remove from category button, which allows removing the product from a single category, and a Remove from catalog button, which completely removes the product from the catalog by deleting its entries in the product and product_category tables. If the product belongs to more categories, only the Remove from category button will be active. If the product belongs to a single category, only the Remove from catalog button will be available because removing it only from its category would generate an orphan product in the product table (a product that doesn t belongs to any category, thus is inaccessible through the current interface). With this componentized template, apart from permitting the administrator to remove products, you ll also see how to assign the currently selected product to an additional category or to move the product to another category.
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Implementing the Presentation Tier
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Figure 7-12 shows how the product details admin page will look for the Black Basque Beret product.
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Figure 7-12. Administering product details
CHAPTER 7 CATALOG ADMINISTRATION
You ll implement the admin_product Smarty componentized template in the following exercise.
Exercise: Implementing admin_product
1. Create the presentation/templates/admin_product.tpl template file, and add the following in it: {* admin_product.tpl *} {load_admin_product assign="admin_product"} <span class="admin_page_text"> Editing product: ID #{$admin_product->mProductId} — {$admin_product->mProductName} [ {strip} <a href="{$admin_product->mAdminProductsLink|prepare_link:"https"}"> back to products ... </a> {/strip} ] </span> <form enctype="multipart/form-data" method="post" action="{$admin_product->mAdminProductTarget|prepare_link:"https"}"> <br /> <span class="admin_page_text">Product belongs to these categories:</span> <span><strong>{$admin_product->mProductCategoriesString}</strong></span> <br /><br /> <span class="admin_page_text">Remove this product from:</span> {html_options name="TargetCategoryIdRemove" options=$admin_product->mRemoveFromCategories} <input type="submit" name="RemoveFromCategory" value="Remove" {if $admin_product->mRemoveFromCategoryButtonDisabled} disabled="disabled" {/if}/> <br /><br /> <span class="admin_page_text">Set display option for this product:</span> {html_options name="ProductDisplay" options=$admin_product->mProductDisplayOptions selected=$admin_product->mProductDisplay} <input type="submit" name="SetProductDisplayOption" value="Set" /> <br /><br /> <span class="admin_page_text">Assign product to this category:</span> {html_options name="TargetCategoryIdAssign" options=$admin_product->mAssignOrMoveTo} <input type="submit" name="Assign" value="Assign" /> <br /><br /> <span class="admin_page_text">Move product to this category:</span> {html_options name="TargetCategoryIdMove" options=$admin_product->mAssignOrMoveTo} <input type="submit" name="Move" value="Move" />
CHAPTER 7 CATALOG ADMINISTRATION
<br /><br /> <input type="submit" name="RemoveFromCatalog" value="Remove product from catalog" {if !$admin_product->mRemoveFromCategoryButtonDisabled} disabled="disabled" {/if} /> <br /><br /> <span class="admin_page_text"> Image name: {$admin_product->mProductImage} <input name="ImageUpload" type="file" value="Upload" /> <input type="submit" name="Upload" value="Upload" /><br /> <img src="product_images/{$admin_product->mProductImage}" border="0" alt="Product image" /> <br /> Thumbnail name: {$admin_product->mProductThumbnail} <input name="ThumbnailUpload" type="file" value="Upload" /> <input type="submit" name="Upload" value="Upload" /><br /> <img src="product_images/{$admin_product->mProductThumbnail}" border="0" alt="Product thumbnail" /> </span> </form> 2. Open business/catalog.php to add the $mProductDisplayOptions member to the Catalog class needed for admin_products as shown: < php // Business tier class for reading product catalog information class Catalog { public static $mProductDisplayOptions = array ('Default', 'On Catalog', 'On Department', 'On Both'); // Retrieves all departments public static function GetDepartments() 3. Create the presentation/smarty_plugins/function.load_admin_product.php file, and add the following in it: < php // Plugin function for the load_admin_product function plugin function smarty_function_load_admin_product($params, $smarty) { // Create AdminProduct object $admin_product = new AdminProduct(); $admin_product->init(); // Assign template variable $smarty->assign($params['assign'], $admin_product);
// // // //
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