Yii2 Bootstrap 3
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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;
/**
* Dropdown renders a Bootstrap dropdown menu component.
*
* @see http://twitter.github.io/bootstrap/javascript.html#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 represents a single
* menu with the following structure:
* - label: string, required, the label of the item link
* - url: string, optional, the url of the item link. Defaults to "#".
* - linkOptions: array, optional, the HTML attributes of the item link.
* - options: array, optional, the HTML attributes of the item.
* - items: array, optional, the dropdown items configuration array. if `items` is set, then `url` of the parent
* item will be ignored and automatically set to "#"
*
* @see https://github.com/twitter/bootstrap/issues/5050#issuecomment-11741727
*/
public $items = array();
/**
* @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()
{
echo $this->renderItems($this->items);
$this->registerPlugin('dropdown');
}
/**
* Renders menu items.
* @param array $items the menu items to be rendered
* @return string the rendering result.
* @throws InvalidConfigException if the label option is not specified in one of the items.
*/
protected function renderItems($items)
{
$lines = array();
foreach ($items as $item) {
if (is_string($item)) {
$lines[] = $item;
continue;
}
if (!isset($item['label'])) {
throw new InvalidConfigException("The 'label' option is required.");
}
$label = $this->encodeLabels ? Html::encode($item['label']) : $item['label'];
$options = ArrayHelper::getValue($item, 'options', array());
$linkOptions = ArrayHelper::getValue($item, 'linkOptions', array());
$linkOptions['tabindex'] = '-1';
if (isset($item['items'])) {
Html::addCssClass($options, 'dropdown-submenu');
$content = Html::a($label, '#', $linkOptions) . $this->renderItems($item['items']);
} else {
$content = Html::a($label, ArrayHelper::getValue($item, 'url', '#'), $linkOptions);
}
$lines[] = Html::tag('li', $content, $options);
}
return Html::tag('ul', implode("\n", $lines), $this->options);
}
}