generate code 39 barcode using c# CREATING THE PRODUCT CATALOG: PART I in C#

Making Code39 in C# CREATING THE PRODUCT CATALOG: PART I

CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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function.load_departments_list.php) work together to generate the list of departments, and use the correct style for the currently selected one. The processing starts at function.load_departments_list.php, which is included in the index.tpl file. The first line in departments_list.tpl loads the plugin: {load_departments_list assign="departments_list"} The load_departments_list plugin function creates and initializes a DepartmentsList object (this class is included in function.load_departments_list.php), which is then assigned to a variable accessible from the Smarty design template file: function smarty_function_load_departments_list($params, $smarty) { // Create DepartmentsList object $departments_list = new DepartmentsList(); $departments_list->init(); // Assign template variable $smarty->assign($params['assign'], $departments_list); } The init() method in DepartmentsList populates a public member of the class ($mDepartments) with an array containing the list of departments and another public member containing the index of the currently selected department ($mSelectedDepartment). Back to the Smarty code now. Inside the HTML code that forms the layout of the Smarty template (presentation/templates/departments_list.tpl), you can see the Smarty tags that do the magic: {section name=i loop=$departments_list->mDepartments} {assign var=selected_d value=""} {* Verify if the department is selected to decide what CSS style to use *} {if ($departments_list->mSelectedDepartment == $departments_list->mDepartments[i].department_id)} {assign var=selected_d value="class=\"selected\""} {/if} {* Generate a link for a new department in the list *} <li> <a {$selected_d} href="{$departments_list->mDepartments[i].link|escape:"html"}"> » {$departments_list->mDepartments[i].name} </a> </li> {/section} Smarty template sections are used for looping over arrays of data. In this case, you want to loop over the departments array kept in $departmentsList->mDepartments:
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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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{section name=i loop=$departments_list->mDepartments} ... {/section} Inside the loop, you verify whether the current department in the loop ($departments_ list->mDepartments[i].department_id) has the ID that was mentioned in the query string ($departments_list->mSelectedDepartment). Depending on this, you decide what style to apply to the name by saving the style name (selected or default style) to a variable named selected_d. This variable is then used to generate the link: <a {$selected_d} href="{$departments_list->mDepartments[i].link|escape:"html"}"> » {$departments_list->mDepartments[i].name} </a>
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Planning Ahead for Secure Connections
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At some point in the development process, you ll want certain pages of your site to be accessible only through secure HTTPS connections to ensure the confidentiality of the data passed from the client to the server and back. Such sensitive pages include user login forms, pages where the user enters credit card data, and so on. We don t get into much detail here because you ll learn much more later in the book. However, what you do need to know is that pages accessed through HTTPS occupy much of a server s resources, and we only want to use a secure connection when visiting secure pages. Implementing this is a bit trickier than it appears. Most of the time, it s more comfortable to use relative links inside the web site. For example, it s typical for the header image of a site to contain a link to index.php rather than http://www.example.com/index.php. In this case, clicking on the header image from a secure page would redirect the user to https://www. example.com/index.php, so the visitor would end up accessing through a secure connection a page that isn t supposed to be accessed like that (and in effect consumes much more server resources than necessary). To avoid this problem and other similar ones, we ll write a bit of code that makes sure all the links in the web site are absolute links.
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Exercise: Preparing Links
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1. Create a new file named presentation/smarty_plugins/modifier.prepare_link.php, and add the following code to it: < php // Plugin functions inside plugin files must be named: smarty_type_name function smarty_modifier_prepare_link($string, $link_type = 'http') {
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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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// Use SSL if ($link_type == 'https' && USE_SSL == 'no') $link_type = 'http'; switch ($link_type) { case 'http': $link = 'http://' . getenv('SERVER_NAME'); // If HTTP_SERVER_PORT is defined and different than default if (defined('HTTP_SERVER_PORT') && HTTP_SERVER_PORT != '80') { // Append server port $link .= ':' . HTTP_SERVER_PORT; } $link .= VIRTUAL_LOCATION . $string; // Escape html return htmlspecialchars($link, ENT_QUOTES); case 'https': $link = 'https://' . getenv('SERVER_NAME') . VIRTUAL_LOCATION . $string; // Escape html return htmlspecialchars($link, ENT_QUOTES); default: return htmlspecialchars($string, ENT_QUOTES); } } > 2. Add two new constants to include/config.php: // Server HTTP port (can omit if the default 80 is used) define('HTTP_SERVER_PORT', '80'); /* Name of the virtual directory the site runs in, for example: '/hatshop/' if the site runs at http://www.example.com/hatshop/ '/' if the site runs at http://www.example.com/ */ define('VIRTUAL_LOCATION', '/hatshop/'); // We enable and enforce SSL when this is set to anything else than 'no' define('USE_SSL', 'yes'); 3. Modify presentation/templates/header.tpl like this: <div id="header"> <a href="{"index.php"|prepare_link:"http"}"> <img src="images/title.png" alt="Site title" /> </a> </div>
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