346 lines
18 KiB
HTML
346 lines
18 KiB
HTML
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<title>Shopping Cart Class : CodeIgniter User Guide</title>
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<td><h1>CodeIgniter User Guide Version 1.7</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Shopping Cart Class
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</td>
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<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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<div id="content">
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<h1>Shopping Cart Class</h1>
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<p>The Cart Class permits items to be added to a session that stays active while a user is browsing your site.
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These items can be retrieved and displayed in a standard "shopping cart" format, allowing the user to update the quantity or remove items from the cart.</p>
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<p>Please note that the Cart Class ONLY provides the core "cart" functionality. It does not provide shipping, credit card authorization, or other processing components.</p>
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<h2>Initializing the Shopping Cart Class</h2>
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<p><strong>Important:</strong> The Cart class utilizes CodeIgniter's
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<a href="sessions.html">Session Class</a> to save the cart information to a database, so before using the Cart class you must set up a database table
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as indicated in the <a href="sessions.html">Session Documentation</a> , and set the session preferences in your <kbd>appliction/config/config.php</kbd> file to utilize a database.</p>
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<p>To initialize the Shopping Cart Class in your controller constructor, use the <dfn>$this->load->library</dfn> function:</p>
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<code>$this->load->library('cart');</code>
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<p>Once loaded, the Cart object will be available using: <dfn>$this->cart</dfn></p>
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<p class="important"><strong>Note:</strong> The Cart Class will load and initialize the Session Class automatically, so unless you are using sessions elsewhere in your application, you do not need to load the Session class.</p>
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<h2>Adding an Item to The Cart</h2>
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<p>To add an item to the shopping cart, simply pass an array with the product information to the <dfn>$this->cart->insert()</dfn> function, as shown below:</p>
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<code>
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$data = array(<br />
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'id' => 'sku_123ABC',<br />
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'qty' => 1,<br />
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'price' => 39.95,<br />
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'name' => 'T-Shirt',<br />
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'options' => array('Size' => 'L', 'Color' => 'Red')<br />
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);<br />
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<br />
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$this->cart->insert($data);
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</code>
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<p class="important"><strong>Important:</strong> The first four array indexes above (<dfn>id</dfn>, <dfn>qty</dfn>, <dfn>price</dfn>, and <dfn>name</dfn>) are <strong>required</strong>.
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If you omit any of them the data will not be saved to the cart. The fifth index (<dfn>options</dfn>) is optional.
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It is intended to be used in cases where your product has options associated with it. Use an array for options, as shown above.</p>
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<p>The five reserved indexes are:</p>
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<ul>
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<li><strong>id</strong> - Each product in your store must have a unique identifier. Typically this will be an "sku" or other such identifier.</li>
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<li><strong>qty</strong> - The quantity being purchased.
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<li><strong>price</strong> - The price of the item.
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<li><strong>name</strong> - The name of the item.
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<li><strong>options</strong> - Any additional attributes that are needed to identify the product. These must be passed via an array.
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</ul>
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<p>In addition to the five indexes above, there are two reserved words: <dfn>rowid</dfn> and <dfn>subtotal</dfn>. These are used internally by the Cart class, so
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please do NOT use those words as index names when inserting data into the cart.</p>
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<p>Your array may contain additional data. Anything you include in your array will be stored in the session. However, it is best to standardize your data among
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all your products in order to make displaying the information in a table easier.</p>
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<h2>Adding Multiple Items to The Cart</h2>
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<p>By using a multi-dimensional array, as shown below, it is possible to add multiple products to the cart in one action. This is useful in cases where you wish to allow
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people to select from among several items on the same page.</p>
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<code>
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$data = array(<br />
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array(<br />
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'id' => 'sku_123ABC',<br />
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'qty' => 1,<br />
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'price' => 39.95,<br />
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'name' => 'T-Shirt',<br />
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'options' => array('Size' => 'L', 'Color' => 'Red')<br />
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),<br />
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array(<br />
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'id' => 'sku_567ZYX',<br />
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'qty' => 1,<br />
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'price' => 9.95,<br />
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'name' => 'Coffee Mug'<br />
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),<br />
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array(<br />
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'id' => 'sku_965QRS',<br />
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'qty' => 1,<br />
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'price' => 29.95,<br />
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'name' => 'Shot Glass'<br />
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)<br />
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);<br />
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<br />
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$this->cart->insert($data);
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</code>
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<h2>Displaying the Cart</h2>
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<p>To display the cart you will create a <a href="../general/views.html">view file</a> with code similar to the one shown below.</p>
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<p>Please note that this example uses the <a href="../helpers/form_helper.html">form helper</a>.</p>
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<textarea class="textarea" style="width:100%" cols="50" rows="55">
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<?php echo form_open('path/to/controller/update/function'); ?>
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<table cellpadding="6" cellspacing="1" style="width:100%" border="0">
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<tr>
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<th>QTY</th>
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<th>Item Description</th>
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<th style="text-align:right">Item Price</th>
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<th style="text-align:right">Sub-Total</th>
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</tr>
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<?php $i = 1; ?>
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<?php foreach($this->cart->contents() as $items): ?>
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<?php echo form_hidden($i.'[rowid]', $items['rowid']); ?>
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<tr>
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<td><?php echo form_input(array('name' => $i.'[qty]', 'value' => $items['qty'], 'maxlength' => '3', 'size' => '5')); ?></td>
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<td>
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<?php echo $items['name']; ?>
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<?php if ($this->cart->has_options($items['rowid']) == TRUE): ?>
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<p>
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<?php foreach ($this->cart->product_options($items['rowid']) as $option_name => $option_value): ?>
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<strong><?php echo $option_name; ?>:</strong> <?php echo $option_value; ?><br />
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<?php endforeach; ?>
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</p>
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<?php endif; ?>
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</td>
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<td style="text-align:right"><?php echo $this->cart->format_number($items['price']); ?></td>
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<td style="text-align:right">$<?php echo $this->cart->format_number($items['subtotal']); ?></td>
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</tr>
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<?php $i++; ?>
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<?php endforeach; ?>
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<tr>
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<td colspan="2"> </td>
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<td class="right"><strong>Total</strong></td>
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<td class="right">$<?php echo $this->cart->format_number($this->cart->total()); ?></td>
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</tr>
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</table>
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<p><?php echo form_submit('', 'Update your Cart'); ?></p>
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</textarea>
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<h2>Updating The Cart</h2>
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<p>To update the information in your cart, you must pass an array containing the <kbd>Row ID</kbd> and quantity to the <dfn>$this->cart->update()</dfn> function:</p>
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<p class="important"><strong>Note:</strong> If the quantity is set to zero, the item will be removed from the cart.</p>
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<code>
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$data = array(<br />
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'rowid' => 'b99ccdf16028f015540f341130b6d8ec',<br />
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'qty' => 3<br />
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);<br />
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<br />
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$this->cart->update($data);
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<br /><br />
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// Or a multi-dimensional array<br /><br />
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$data = array(<br />
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array(<br />
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'rowid' => 'b99ccdf16028f015540f341130b6d8ec',<br />
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'qty' => 3<br />
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),<br />
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array(<br />
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'rowid' => 'xw82g9q3r495893iajdh473990rikw23',<br />
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'qty' => 4<br />
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),<br />
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array(<br />
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'rowid' => 'fh4kdkkkaoe30njgoe92rkdkkobec333',<br />
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'qty' => 2<br />
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)<br />
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);<br />
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<br />
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$this->cart->update($data);
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</code>
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<p><strong>What is a Row ID?</strong> The <kbd>row ID</kbd> is a unique identifier that is generated by the cart code when an item is added to the cart. The reason a
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unique ID is created is so that identical products with different options can be managed by the cart.</p>
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<p>For example, let's say someone buys two identical t-shirts (same product ID), but in different sizes. The product ID (and other attributes) will be
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identical for both sizes because it's the same shirt. The only difference will be the size. The cart must therefore have a means of identifying this
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difference so that the two sizes of shirts can be managed independently. It does so by creating a unique "row ID" based on the product ID and any options associated with it.</p>
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<p>In nearly all cases, updating the cart will be something the user does via the "view cart" page, so as a developer, it is unlikely that you will ever have to concern yourself
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with the "row ID", other then making sure your "view cart" page contains this information in a hidden form field, and making sure it gets passed to the update
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function when the update form is submitted. Please examine the construction of the "view cart" page above for more information.</p>
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<p> <br /></p>
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<h1>Function Reference</h1>
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<h2>$this->cart->insert();</h2>
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<p>Permits you to add items to the shopping cart, as outlined above.</p>
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<h2>$this->cart->update();</h2>
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<p>Permits you to update items in the shopping cart, as outlined above.</p>
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<h2>$this->cart->total();</h2>
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<p>Displays the total amount in the cart.</p>
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<h2>$this->cart->total_items();</h2>
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<p>Displays the total number of items in the cart.</p>
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<h2>$this->cart->contents();</h2>
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<p>Returns an array containing everything in the cart.</p>
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<h2>$this->cart->has_options(rowid);</h2>
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<p>Returns TRUE (boolean) if a particular row in the cart contains options. This function is designed to be used in a loop with <dfn>$this->cart->contents()</dfn>, since you must pass the <kbd>rowid</kbd> to this function, as shown in the <dfn>Displaying the Cart</dfn> example above.</p>
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<h2>$this->cart->options(rowid);</h2>
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<p>Returns an array of options for a particular product. This function is designed to be used in a loop with <dfn>$this->cart->contents()</dfn>, since you must pass the <kbd>rowid</kbd> to this function, as shown in the <dfn>Displaying the Cart</dfn> example above.</p>
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<h2>$this->cart->destroy();</h2>
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<p>Permits you to destroy the cart. This function will likely be called when you are finished processing the customer's order.</p>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="calendar.html">Calendar Class</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="config.html">Config Class</a>
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</p>
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