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CHAPTER 7 CATALOG ADMINISTRATION
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exit; } else $this->mLoginMessage = 'Login failed. Please try again:'; } The logout link in admin_menu.tpl simply unsets the admin_logged session variable in admin.php and redirects the administrator to index.php. This way, on the next attempt to access the admin page, the administrator will be redirected to the login page. // If loggin out ... if (isset ($_GET['Page']) && ($_GET['Page'] == 'Logout')) { unset($_SESSION['admin_logged']); header('Location: admin.php'); exit; }
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Administering Departments
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The department administration section allows the client to add, remove, or change department information. To implement this functionality, you ll need to write the necessary code for the presentation, business, and data layers. One fundamental truth regarding n-Tiered applications (which also applies to this particular case) is that the business and data tiers are ultimately created to support the presentation tier. Drawing on paper and establishing exactly how you want the site to look (in other words, what functionality needs to be supported by the UI) is a good indication of what the database and business tier will contain. With the proper design work, you can know exactly what to place in each tier, so the order of writing the code doesn t matter. When the design is clearly established, a team of programmers can work at the same time and implement the three tiers concurrently, which is one of the benefits of having a tiered architecture. However, this rarely happens in practice, except for the largest projects that really need very careful design and planning. In our case, usually the best way is to start with the lower levels (the database and data object) to have the basics established before creating the UI. For this to happen, first you need to analyze what functionality you ll need for the UI; otherwise, you won t know what to write in the data and business tiers. In this chapter, we will always start with the presentation tier. You can do this because now you have a good overview of the architecture and know beforehand how you ll implement the other two tiers. This knowledge is necessary because in the presentation tier, you call methods from the business tier (which you haven t created yet), and in the business tier, you call the data tier (which, again, you haven t yet created). If you don t have a clear idea of how to implement the other tiers, starting with the presentation tier can be trickier in the long run.
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CHAPTER 7 CATALOG ADMINISTRATION
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Because you already have a working architecture, it will be simple to write components as needed for each tier. Of course, if you had to implement something new or more complicated, we would have spent some time analyzing the full implications, but here you won t do anything more complicated than the code in the previous chapters. You ll apply the same technique for all componentized templates you ll build in this chapter.
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Implementing the Presentation Tier
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Take another look at what the admin_departments componentized template looks like in action (see Figure 7-9).
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Figure 7-9. The admin_departments componentized template in action This componentized template will generate a list populated with the departments information, and it also has a label, two text boxes, and a button used to add new departments to the list. When you click on a department s Edit button, the name and the description of that department becomes editable, and the Update and Cancel buttons appear in place of the Edit button, as you saw earlier in Figure 7-3.
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Exercise: Implementing the admin_departments Componentized Template
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1. Create a new template file named admin_departments.tpl in the presentation/templates folder, and add the following code to it: {* admin_departments.tpl *} {load_admin_departments assign="admin_departments"} <span class="admin_page_text">Edit the departments of HatShop:</span> <br /><br /> {if $admin_departments->mErrorMessage neq ""} <span class="admin_error_text">
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