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| <h1>Shopping Cart Class</h1> | |
| <p>The Cart Class permits items to be added to a session that stays active while a user is browsing your site. | |
| 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> | |
| <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> | |
| <h2>Initializing the Shopping Cart Class</h2> | |
| <p><strong>Important:</strong> The Cart class utilizes CodeIgniter's | |
| <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 | |
| 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> | |
| <p>To initialize the Shopping Cart Class in your controller constructor, use the <dfn>$this->load->library</dfn> function:</p> | |
| <code>$this->load->library('cart');</code> | |
| <p>Once loaded, the Cart object will be available using: <dfn>$this->cart</dfn></p> | |
| <p class="important"><strong>Note:</strong> The Cart Class will load and initialize the Session Class automatically, so unless you are using sessions elsewhere in your application, you do not need to load the Session class.</p> | |
| <h2>Adding an Item to The Cart</h2> | |
| <p>To add an item to the shopping cart, simply pass an array with the product information to the <dfn>$this->cart->insert()</dfn> function, as shown below:</p> | |
| <code> | |
| $data = array(<br /> | |
| 'id' => 'sku_123ABC',<br /> | |
| 'qty' => 1,<br /> | |
| 'price' => 39.95,<br /> | |
| 'name' => 'T-Shirt',<br /> | |
| 'options' => array('Size' => 'L', 'Color' => 'Red')<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->insert($data); | |
| </code> | |
| <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>. | |
| If you omit any of them the data will not be saved to the cart. The fifth index (<dfn>options</dfn>) is optional. | |
| 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> | |
| <p>The five reserved indexes are:</p> | |
| <ul> | |
| <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> | |
| <li><strong>qty</strong> - The quantity being purchased. | |
| <li><strong>price</strong> - The price of the item. | |
| <li><strong>name</strong> - The name of the item. | |
| <li><strong>options</strong> - Any additional attributes that are needed to identify the product. These must be passed via an array. | |
| </ul> | |
| <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 | |
| please do NOT use those words as index names when inserting data into the cart.</p> | |
| <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 | |
| all your products in order to make displaying the information in a table easier.</p> | |
| <h2>Adding Multiple Items to The Cart</h2> | |
| <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 | |
| people to select from among several items on the same page.</p> | |
| <code> | |
| $data = array(<br /> | |
| array(<br /> | |
| 'id' => 'sku_123ABC',<br /> | |
| 'qty' => 1,<br /> | |
| 'price' => 39.95,<br /> | |
| 'name' => 'T-Shirt',<br /> | |
| 'options' => array('Size' => 'L', 'Color' => 'Red')<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_567ZYX',<br /> | |
| 'qty' => 1,<br /> | |
| 'price' => 9.95,<br /> | |
| 'name' => 'Coffee Mug'<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_965QRS',<br /> | |
| 'qty' => 1,<br /> | |
| 'price' => 29.95,<br /> | |
| 'name' => 'Shot Glass'<br /> | |
| )<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->insert($data); | |
| </code> | |
| <h2>Updating The Cart</h2> | |
| <p>To update the information in your cart, pass an array containing the product ID and quantity to the <dfn>$this->cart->update()</dfn> function:</p> | |
| <code> | |
| $data = array(<br /> | |
| 'id' => '123XYZ',<br /> | |
| 'qty' => 3<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->update($data); | |
| </code> | |
| <p>Just as you can when inserting, you may use a multi-dimensional array in order to update multiple items simultaneously:</p> | |
| <code> | |
| $data = array(<br /> | |
| array(<br /> | |
| 'id' => 'sku_123ABC',<br /> | |
| 'qty' => 3<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_567ZYX',<br /> | |
| 'qty' => 4<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_965QRS',<br /> | |
| 'qty' => 2<br /> | |
| )<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->update($data); | |
| </code> | |
| <h2>Deleting an Item From The Cart</h2> | |
| <p>To delete an item from your cart, pass an array containing the product ID and a quantity of zero to the <dfn>$this->cart->update()</dfn> function:</p> | |
| <code> | |
| $data = array(<br /> | |
| 'id' => '123XYZ',<br /> | |
| 'qty' => 0<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->update($data); | |
| </code> | |
| <p>You may use a multi-dimensional array in order to delete multiple items simultaneously:</p> | |
| <code> | |
| $data = array(<br /> | |
| array(<br /> | |
| 'id' => 'sku_123ABC',<br /> | |
| 'qty' => 0<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_567ZYX',<br /> | |
| 'qty' => 0<br /> | |
| ),<br /> | |
| array(<br /> | |
| 'id' => 'sku_965QRS',<br /> | |
| 'qty' => 0<br /> | |
| )<br /> | |
| );<br /> | |
| <br /> | |
| $this->cart->update($data); | |
| </code> | |
| <h2>Displaying the Cart</h2> | |
| <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> | |
| <p>Please note that this example uses the <a href="../helpers/form_helper.html">form helper</a>.</p> | |
| <textarea class="textarea" style="width:100%" cols="50" rows="55"> | |
| <?php echo form_open('path/to/controller/update/function'); ?> | |
| <table cellpadding="6" cellspacing="1" style="width:100%" border="0"> | |
| <tr> | |
| <th>QTY</th> | |
| <th>Item Description</th> | |
| <th style="text-align:right">Item Price</th> | |
| <th style="text-align:right">Sub-Total</th> | |
| </tr> | |
| <?php $i = 1; ?> | |
| <?php foreach($this->cart->contents() as $items): ?> | |
| <?php echo form_hidden($i.'[rowid]', $items['rowid']); ?> | |
| <tr> | |
| <td><?php echo form_input(array('name' => $i.'[qty]', 'value' => $items['qty'], 'maxlength' => '3', 'size' => '5')); ?></td> | |
| <td> | |
| <?php echo $items['name']; ?> | |
| <?php if ($this->cart->has_options($items['rowid']) == TRUE): ?> | |
| <p> | |
| <?php foreach ($this->cart->product_options($items['rowid']) as $option_name => $option_value): ?> | |
| <strong><?php echo $option_name; ?>:</strong> <?php echo $option_value; ?><br /> | |
| <?php endforeach; ?> | |
| </p> | |
| <?php endif; ?> | |
| </td> | |
| <td style="text-align:right"><?php echo $items['price']; ?></td> | |
| <td style="text-align:right">$<?php echo $items['subtotal']; ?></td> | |
| </tr> | |
| <?php $i++; ?> | |
| <?php endforeach; ?> | |
| <tr> | |
| <td colspan="2"> </td> | |
| <td class="right"><strong>Total</strong></td> | |
| <td class="right">$<?php echo $this->cart->total(); ?></td> | |
| </tr> | |
| </table> | |
| <p><?php echo form_submit('', 'Update your Cart'); ?></p> | |
| </textarea> | |
| <p> <br /></p> | |
| <h1>Function Reference</h1> | |
| <h2>$this->cart->insert();</h2> | |
| <p>Permits you to add items to the shopping cart, as outlined above.</p> | |
| <h2>$this->cart->update();</h2> | |
| <p>Permits you to update items in the shopping cart, as outlined above.</p> | |
| <h2>$this->cart->total();</h2> | |
| <p>Displays the total amount in the cart.</p> | |
| <h2>$this->cart->total_items();</h2> | |
| <p>Displays the total number of items in the cart.</p> | |
| <h2>$this->cart->contents();</h2> | |
| <p>Returns an array containing everything in the cart.</p> | |
| <h2>$this->cart->has_options(rowid);</h2> | |
| <p>Returns TRUE (boolean) if a particular row in the cart contains options. This function is designed to be used in a loop with <dfn>$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> | |
| <h2>$this->cart->options(rowid);</h2> | |
| <p>Returns an array of options for a particular product. This function is designed to be used in a loop with <dfn>$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> | |
| <h2>$this->cart->destroy();</h2> | |
| <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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