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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\bootstrap;
use yii\base\InvalidConfigException;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;
use yii\helpers\Url;
/**
* Dropdown renders a Bootstrap dropdown menu component.
*
* For example,
*
* ```php
* <div class="dropdown">
* <a href="#" data-toggle="dropdown" class="dropdown-toggle">Label <b class="caret"></b></a>
* <?php
* echo Dropdown::widget([
* 'items' => [
* ['label' => 'DropdownA', 'url' => '/'],
* ['label' => 'DropdownB', 'url' => '#'],
* ],
* ]);
* ?>
* </div>
* ```
* @see http://getbootstrap.com/javascript/#dropdowns
* @author Antonio Ramirez <amigo.cobos@gmail.com>
* @since 2.0
*/
class Dropdown extends Widget
{
/**
* @var array list of menu items in the dropdown. Each array element can be either an HTML string,
* or an array representing a single menu with the following structure:
*
* - label: string, required, the label of the item link
* - url: string|array, optional, the url of the item link. This will be processed by [[Url::to()]].
* If not set, the item will be treated as a menu header when the item has no sub-menu.
* - visible: boolean, optional, whether this menu item is visible. Defaults to true.
* - linkOptions: array, optional, the HTML attributes of the item link.
* - options: array, optional, the HTML attributes of the item.
* - items: array, optional, the submenu items. The structure is the same as this property.
* Note that Bootstrap doesn't support dropdown submenu. You have to add your own CSS styles to support it.
*
* To insert divider use `<li role="presentation" class="divider"></li>`.
*/
public $items = [];
/**
* @var boolean whether the labels for header items should be HTML-encoded.
*/
public $encodeLabels = true;
/**
* Initializes the widget.
* If you override this method, make sure you call the parent implementation first.
*/
public function init()
{
parent::init();
Html::addCssClass($this->options, 'dropdown-menu');
}
/**
* Renders the widget.
*/
public function run()
{
BootstrapPluginAsset::register($this->getView());
$this->registerClientEvents();
return $this->renderItems($this->items, $this->options);
}
/**
* Renders menu items.
* @param array $items the menu items to be rendered
* @param array $options the container HTML attributes
* @return string the rendering result.
* @throws InvalidConfigException if the label option is not specified in one of the items.
*/
protected function renderItems($items, $options = [])
{
$lines = [];
foreach ($items as $i => $item) {
if (isset($item['visible']) && !$item['visible']) {
continue;
}
if (is_string($item)) {
$lines[] = $item;
continue;
}
if (!array_key_exists('label', $item)) {
throw new InvalidConfigException("The 'label' option is required.");
}
$encodeLabel = isset($item['encode']) ? $item['encode'] : $this->encodeLabels;
$label = $encodeLabel ? Html::encode($item['label']) : $item['label'];
$itemOptions = ArrayHelper::getValue($item, 'options', []);
$linkOptions = ArrayHelper::getValue($item, 'linkOptions', []);
$linkOptions['tabindex'] = '-1';
$url = array_key_exists('url', $item) ? $item['url'] : null;
if (empty($item['items'])) {
if ($url === null) {
$content = $label;
Html::addCssClass($itemOptions, 'dropdown-header');
} else {
$content = Html::a($label, $url, $linkOptions);
}
} else {
$submenuOptions = $options;
unset($submenuOptions['id']);
$content = Html::a($label, $url === null ? '#' : $url, $linkOptions)
. $this->renderItems($item['items'], $submenuOptions);
Html::addCssClass($itemOptions, 'dropdown-submenu');
}
$lines[] = Html::tag('li', $content, $itemOptions);
}
return Html::tag('ul', implode("\n", $lines), $options);
}
}
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