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CHAPTER 16 PRODUCT REVIEWS
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:review, :rating);'; // Build the parameters array $params = array (':customer_id' => $customer_id, ':product_id' => $productId, ':review' => $review, ':rating' => $rating); // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query return DatabaseHandler::Execute($result, $params); }
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Implementing the User Interface
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Now it s time to see the code you ve written so far in action. The UI consists of the reviews componentized template that will be placed on the product details page. You ll create it in the following exercise.
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Exercise: Creating the reviews Componentized Template
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1. Create the file presentation/templates/reviews.tpl, and add the following to it: {* reviews.tpl *} {load_reviews assign="reviews"} {if $reviews->mTotalReviews != 0} <span class="description">Customer reviews:</span><br /> <ul> {section name=cReviews loop=$reviews->mReviews} <li> Review by <strong>{$reviews->mReviews[cReviews].customer_name}</strong> on {$reviews->mReviews[cReviews].created_on|date_format:"%A, %B %e, %Y"} <br /><br /> <span> {$reviews->mReviews[cReviews].review} <br /><br /> Rating: [{$reviews->mReviews[cReviews].rating} of 5] </span> <br /> </li> {/section} </ul> {else} <span class="description"> Be the first person to voice your opinion!<br /><br />
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CHAPTER 16 PRODUCT REVIEWS
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</span> {/if} {if $reviews->mEnableAddProductReviewForm} {* add review form *} <span class="description"> Add a review:</span><br /><br /> <form method="post" action="{$reviews->mAddProductReviewTarget|prepare_link:"http"}"> <table class="add_review"> <tr> <td> From: <strong>{$reviews->mReviewerName}</strong> </td> </tr> <tr> <td> <textarea name="review" rows="3" cols="65">[Add your review here]</textarea> </td> </tr> <tr> <td> <table class="add_review"> <tr> <td> Your Rating: <input type="radio" name="rating" value="1" /> 1 <input type="radio" name="rating" value="2" /> 2 <input type="radio" name="rating" value="3" checked="checked" /> 3 <input type="radio" name="rating" value="4" /> 4 <input type="radio" name="rating" value="5" /> 5 </td> <td align="right"> <input type="submit" name="AddProductReview" value="Add review" /> </td> </tr> </table> </td> </tr> </table> </form> {else} <span> <strong>You must log in to add a review.<strong/> </span>
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CHAPTER 16 PRODUCT REVIEWS
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{/if} 2. Create the presentation/smarty_plugins/function.load_reviews.php file, and add the following in it: < php // Plugin functions inside plugin files must be named: smarty_type_name function smarty_function_load_reviews($params, $smarty) { // Create Reviews object $reviews = new Reviews(); $reviews->init(); // Assign template variable $smarty->assign($params['assign'], $reviews); } // Class that handles product reviews class Reviews { public $mProductId; public $mReviews; public $mTotalReviews; public $mReviewerName; public $mEnableAddProductReviewForm = false; public $mAddProductReviewTarget = 'index.php'; public function __construct() { if (isset ($_GET['ProductID'])) $this->mProductId = (int)$_GET['ProductID']; else trigger_error('ProductID not set', E_USER_ERROR); $this->mAddProductReviewTarget .= ' ProductID=' . $this->mProductId; } public function init() { // If visitor is logged in ... if (Customer::IsAuthenticated()) { // Check if visitor is adding a review if (isset($_POST['AddProductReview'])) Catalog::CreateProductReview(Customer::GetCurrentCustomerId(), $this->mProductId, $_POST['review'], $_POST['rating']);
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CHAPTER 16 PRODUCT REVIEWS
// Display "add review" form because visitor is registered $this->mEnableAddProductReviewForm = true; // Get visitor's (reviewer's) name $customer_data = Customer::Get(); $this->mReviewerName = $customer_data['name']; } // Get reviews for this product $this->mReviews = Catalog::GetProductReviews($this->mProductId); // Get the number of the reviews $this->mTotalReviews = count($this->mReviews); } } > 3. Open presentation/templates/product.tpl, and add the following lines at the end of it: <br /><br /> {include file="reviews.tpl"} 4. Add the following styles at the end of hatshop.css: ul { list-style-type: none; padding: 0px; } li span { background: #ccddff; display: block; padding: 5px; } .add_review tr td { background: #e6e6e6; border: none; }
CHAPTER 16 PRODUCT REVIEWS
5. Load index.php in your browser, click on a product to view its product details page, and admire the results (refer to Figure 16-1 at the beginning of this chapter). You must be logged in to add new reviews.
How It Works: The reviews Componentized Template
The reviews componentized template takes care of both displaying the reviews and adding a new review. The first part of the reviews.tpl file determines whether you have any reviews to display for the current product. If you don t, a short message appears encouraging your visitor to write the first review. {if $reviews->mTotalReviews != 0} <span class="description">Customer reviews:</span><br /> [a list with reviews] {else} <span class="description"> Be the first person to voice your opinion!<br /><br /> </span> {/if} The second part of the template displays a form to add a review or a message that invites your visitor to log in to be able to add a review: {if $reviews->mEnableAddProductReviewForm} {* add review form *} <span class="description"> Add a review:</span><br /><br /> [add review form] {else} <span> <strong>You must log in to add a review.<strong/> </span> {/if} The code from the function plugin is pretty straightforward and should not be a problem for you.
Summary
Yep, it was that simple. Although you might want to add certain improvements for your own solution (for example, allow the visitors to edit their reviews, or forbid them from adding more reviews), the base is there, and it works as expected. You re now all set to proceed to the final chapter of this book, where you ll learn how to sell items to your customer from Amazon.com by using XML Web Services.
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