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9: ConsolidatedRetail.com Functionality 133
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One of the most important aspects of implementing an e-commerce site is providing an easy way for customers to browse the catalogs. The ConsolidatedRetail.com site does this in four ways: G Catalogs are always listed in the user interface. G Users can browse through hierarchically organized categories. G Users can search all or some of the catalogs for a particular string. G Users can browse through the product detail pages in a single catalog or in a search result (wizard browsing).
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There may be catalogs for which limited access is appropriate. To require authentication for access to a specific catalog, you can use the Business Desk to specify that user authentication is required. Thereafter, each time a user attempts to browse, search, or use a list to view products in a restricted catalog, the Reference Architecture application checks to see that the user is authenticated and has access to that catalog. (To prevent performance degradation, this validation process uses the CatalogsetId and CatalogSetCache.) The Reference Architecture code performs this validation when a user attempts to access the following pages: G Public or private Shopping List G Save for Later basket G Product detail page G Category browse page G Search results G Advanced search results Code to enable this validation appears in the following files: G Include/Basket.asp G Include/Site_Const.asp G Xml/rc.xml G _additem.asp G _additemsfromlist.asp G _moveitemsfromsfl.asp G Basket.asp G Category.pasp G Product.pasp G SearchResults.pasp G StepSearch.pasp
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134 Reference Architecture for Commerce
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The catalogs available to the current user are always listed in the left pane of the user interface. This is achieved by including the code to determine the available catalogs and display them in the PageEnd procedure in Common.asp, as described next: 1. Retrieve a list of catalogs based on user type by checking the constant for CatalogSetCache, which identifies the catalog set assigned to the user:
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Sub PageEnd() Dim strOut strOut = CachedFragmentLookup( CATALOGSET_CACHE , GetDefaultCatalogSet() ) Response.Write strOut
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2. Call GetDefaultCatalogSet, which returns the registered default catalog set for
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an authenticated, registered user or the anonymous default catalog set for all other users. To confirm the user s authentication credentials, instantiate and initialize an AuthManager object:
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GetDefaultCatalogSet() Dim objMSCSAuthMgr Set objMSCSAuthMgr = Server.CreateObject(mc_strAuthManager) Call objMSCSAuthMgr.Initialize(Application("MSCSDictConfig").s_SiteName)
3. If the user is authenticated, and the authentication ticket has not timed out,
retrieve the catalog set assigned to that user.
If objMSCSAuthMgr.IsAuthenticated() Then 'DefaultRegisteredCatalogSet GetdefaultCatalogSet = Application("MSCSDictConfig"). s_AuthenticatedUserDefaultCatalogSet
4. Otherwise, retrieve the catalog set for anonymous users, and clear the
AuthManager object.
Else 'DefaultAnonymousCatalogSet GetDefaultCatalogSet = Application("MSCSDictConfig").s_ AnonymousUserDefaultCatalogSet End If Set objMSCSAuthMgr = Nothing End Function
When the XML produced by this code is rendered using the UI_layout-IE5.xsl style sheet, the resulting Web page displays the name of each catalog in the catalog set as a link to Category.pasp. The XML fragment generated looks like the following:
<catalog> <catalogname>Books</catalogname> <catalognameurl>Books</catalognameurl> </catalog> <catalog>
9: ConsolidatedRetail.com Functionality 135
<catalogname>Hardware</catalogname> <catalognameurl>Hardware</catalognameurl> </catalog>
Browsing the Catalogs
The catalogs in the ConsolidatedRetail.com site are implemented as hierarchical structures. Two catalogs, called books and hardware, each contain several categories. The books catalog also contains a layer of sub-categories. Products can be stored in any level of the catalog. The page used to browse the catalog data in the ConsolidatedRetail.com site is Category.pasp. The page can be used in one of two modes: root-level mode and category mode. In root-level mode, the page retrieves the products and categories from the root of the specified catalog. In category mode, the page retrieves the products, sub-categories, and parent categories from the specified category. The page contains code to perform the following tasks: 1. Use the MSCSAppFrameWork object to retrieve the txtCatalog and txtCategory values passed in the request string. If no txtCatalog value is found, the page redirects the user to Index.pasp. 2. Call PageStart to generate the XML header for the page. 3. Retrieve the ProductCatalog object for the specified catalog from the MSCSCatalogManager application variable, and write the catalog name into a <searchscope> XML element. 4. Render the properties of the catalog as XML. This allows properties such as the catalog name to be rendered in the user interface. 5. Determine whether or not a category name was passed in the request string. If no category name was specified, then the page retrieves the categories and products from the root of the catalog and formats them as XML. If a category was provided, then the page retrieves the data from that category and formats it as XML. 6. Call the PageEnd procedure to close the XML document. Before using the Commerce Server Catalog objects to retrieve catalog information, the page uses the following code to create a <searchscope> element:
Call XMLTag(c_strSearchScope, strCatalogName)
The UI_layout-IE5.xsl style sheet uses this element to pass the current catalog name to the search functionality, thus scoping the search. (The search functionality is described in detail later in this chapter.)
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