generate code 39 barcode in c# Implementing the Presentation Tier in C#

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Implementing the Presentation Tier
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The catalog-searching feature has two separate interface elements that you need to implement: A componentized template named search_box, whose role is to provide the means to enter the search string for the visitor (refer to Figure 5-1). A componentized template named search_results, which displays the products matching the search criteria (refer to Figure 5-2). You ll create the two componentized templates in two separate exercises.
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Creating the Search Box
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Follow the steps in the exercise to build the search_box componentized template, and integrate it into HatShop.
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CHAPTER 5 SEARCHING THE CATALOG
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Exercise: Creating the search_box Componentized Template
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1. Create a new template file named search_box.tpl in the presentation/templates folder, and add the following code to it: {* search_box.tpl *} {load_search_box assign="search_box"} {* Start search box *} <div class="left_box" id="search_box"> <p>Search the Catalog</p> <form action={"index.php"|prepare_link:"http"}> <input maxlength="100" id="Search" name="Search" value="{$search_box->mSearchString}" size="23" /> <input type="submit" value="Go!" /><br /> <input type="checkbox" id="AllWords" name="AllWords" {if $search_box->mAllWords == "on" } checked="checked" {/if}/> Search for all words </form> </div> {* End search box *} 2. Create a new Smarty function plugin file named function.load_search_box.php in the presentation/smarty_plugins folder with the following code in it: < php // Plugin functions inside plugin files must be named: smarty_type_name function smarty_function_load_search_box($params, $smarty) { // Create SearchBox object $search_box = new SearchBox(); // Assign template variable $smarty->assign($params['assign'], $search_box); } // Manages the search box class SearchBox { // Public variables for the smarty template public $mSearchString = ''; public $mAllWords = 'off'; // Class constructor public function __construct() { if (isset ($_GET['Search'])) $this->mSearchString = $_GET['Search'];
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CHAPTER 5 SEARCHING THE CATALOG
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if (isset ($_GET['AllWords'])) $this->mAllWords = $_GET['AllWords']; } } > 3. Add the following styles needed in the search_box template file to the hatshop.css file: #search_box { border: 1px solid #0583b5; } #search_box p { background: #0583b5; } form { margin: 2px; } input { font-family: tahoma, verdana, arial; font-size: 11px; } 4. Modify the index.tpl file to load the newly created template file: ... {include file="departments_list.tpl"} {include file="$categoriesCell"} {include file="search_box.tpl"} ... 5. Load your project in a browser, and you'll see the search box resting nicely in its place (refer to Figure 5-1).
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How It Works: The search_box Componentized Template
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By now, you re used to the way we use function plugins in conjunction with Smarty templates. In this case, we use the plugin to maintain the state of the search box after performing a search. When the page is reloaded after clicking the Go! button, we want to keep the entered string in the text box and also maintain the state of the AllWords check box. The load_search_box function plugin simply saves the values of the Search and AllWords query string parameters, while checking to make sure these parameters actually exist in the query string. These values are then used in the search_box.tpl Smarty template to recreate the previous state. Note that we could have implemented this functionality by reading the values of the Search and AllWords query string parameters using $smarty.get.Search and $smarty.get.AllWords instead of a plugin. However, having a plugin gives you more control over the process and also avoids generating warnings in case the mentioned parameters don t exist in the query string.
CHAPTER 5 SEARCHING THE CATALOG
Displaying the Search Results
In the next exercise, you ll create the componentized template that displays the search results. To make your life easier, you can reuse the product_list componentized template to display the actual list of products. This is the componentized template that we have used so far to list products for the main page, for departments, and for categories. Of course, if you want to have the search results displayed in another format, you must create another user control. You ll need to modify the templates-logic file of the products list (products_list.php) to recognize when it s being called to display search results, so it calls the correct method of the business tier to get the list of products. Let s create the search_result template and update the templates-logic file of the products_list componentized template in the following exercise:
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