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<p>This is how I've done it, (very easy to do)</p> <ol> <li>download jQuery, + <a href="http://www.appelsiini.net/projects/chained" rel="nofollow">jquery.chained.js</a></li> <li>insert jQuery + jquery.chained.js to the CI view(s)</li> <li>create function for generating selects from database</li> <li>calling the function</li> </ol> <p>as far my structure of tables is as following (I know it can be easily done in one table)</p> <p><strong>category</strong></p> <pre><code>CREATE TABLE IF NOT EXISTS `category` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(64) NOT NULL, `active` tinyint(1) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=9 ; INSERT INTO `category` (`id`, `name`, `active`) VALUES (3, 'Science', 1), (4, 'History', 1); </code></pre> <p><strong>subcategory</strong></p> <pre><code>CREATE TABLE IF NOT EXISTS `subcategory` ( `id` int(11) NOT NULL AUTO_INCREMENT, `category_id` int(11) NOT NULL, `name` varchar(64) NOT NULL, `active` int(11) NOT NULL, PRIMARY KEY (`id`), KEY `category_id` (`category_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=21 ; INSERT INTO `subcategory` (`id`, `category_id`, `name`, `active`) VALUES (2, 3, 'Mathematics', 1), (3, 3, 'Physics', 1), (4, 3, 'Medicine', 1), (5, 4, '21st Century', 1), (6, 4, '18-20th Century', 1), (7, 4, '15-17th Century', 1), (8, 4, 'Before 15th Century', 1); ALTER TABLE `subcategory` ADD CONSTRAINT `subcategory_ibfk_1` FOREIGN KEY (`category_id`) REFERENCES `category` (`id`); </code></pre> <p>Now I just load all the <em>active</em> categories/subcategories and create <code><select></code>s for both of them. </p> <p>Note that I am using twitter-bootstrap 2 so there is some extra <code>HTML</code>.</p> <p>Note that I am extending <strong>CI_Controller</strong> with my own <strong>MY_Controller</strong> file therefore I can set "global" <code>$data[]</code> (that is passed to <strong>view</strong>) by doing <code>$this->data['key']</code> to exted CI_Controller follow this <a href="http://philsturgeon.co.uk/blog/2010/02/CodeIgniter-Base-Classes-Keeping-it-DRY" rel="nofollow">tutorial</a>.</p> <p>Note that it has built in "repopulate feature" so whenever you pass (valid or invalid) <code>category_id && || $subcategory_id</code> it looks in the DB if parameters are correct and cateogry/subcategory exists if so it repopulates itself.</p> <pre><code>public function category_chain($category_id = FALSE, $subcategory_id = FALSE) { $this->load->model('general_model'); $repopulate['category'] = ''; $repopulate['subcategory'] = ''; if (($category_id !== FALSE && $subcategory_id !== FALSE) || ($category_id !== "FALSE" && $subcategory_id !== "FALSE")) { if ($this->general_model->_isInDBWhere('subcategory', array('id' => $subcategory_id, 'category_id' => $category_id))) { $repopulate['category'] = $category_id; $repopulate['subcategory'] = $subcategory_id; } } if (($category_id !== FALSE && $subcategory_id === FALSE) || ($category_id !== "FALSE" && $subcategory_id === "FALSE")) { if ($this->general_model->_isInDB('category', 'id', $category_id)) { $repopulate['category'] = $category_id; $repopulate['subcategory'] = ''; } } $categories = $this->general_model->_getAllWhere('category', 'active', '1'); $subcategories = $this->general_model->_getAllWhere('subcategory', 'active', '1'); $return = "<div class=\"control-group\"> <label class=\"control-label\">.category </label> <div class=\"controls\"> <div class=\"input-prepend\"> <span class=\"add-on\"><i class=\"icon-th-large\"></i></span>"; $return .= "<select name=\"category_id\" id=\"category\">"; $return .= "<option value=\"\">--</option>"; foreach ($categories as $category) { $return .= "<option value=\"".$category->id."\"".(($repopulate['category'] == $category->id) ? " selected": "").">".$category->name."</option>"; } $return .= "</select>"; $return .= "</div></div></div>"; $return .= "<div class=\"control-group\"> <label class=\"control-label\">.subcategory </label> <div class=\"controls\"> <div class=\"input-prepend\"> <span class=\"add-on\"><i class=\"icon-th\"></i></span>"; $return .= "<select name=\"subcategory_id\" id=\"subcategory\">"; $return .= "<option value=\"\">--</option>"; foreach ($subcategories as $subcategory) { $return .= "<option value=\"".$subcategory->id."\" class=\"".$subcategory->category_id."\"".(($repopulate['subcategory'] == $subcategory->id) ? " selected": "").">".$subcategory->name."</option>"; } $return .= "</select>"; $return .= "</div></div></div>"; $this->data['category_chain'] = $return; } </code></pre> <p>lastly create <code>application/models/general_model.php</code> and create this function</p> <pre><code>function _getAllWhere($table, $where, $value) { $q = $this->db->get_where($table, array($where => $value)); return ($q->num_rows() > 0) ? $q->result() : FALSE; } </code></pre> <p>Lasts step is to call the function in a way that it is called just when we need it. In desired controller just call <code>$this->category_chain()</code> and in view there will be a variable avalible <code>$category_chain</code> (just echo it out like <code><?=$category_chain?></code>)</p> <p>Thats it ;)</p>
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