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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\bootstrap4;
use Yii;
use yii\base\InvalidConfigException;
use yii\helpers\ArrayHelper;
/**
* Breadcrumbs represents a bootstrap 4 version of [[\yii\widgets\Breadcrumbs]]. It displays
* a list of links indicating the position of the current page in the whole site hierarchy.
*
* To use Breadcrumbs, you need to configure its [[links]] property, which specifies the links to be displayed. For example,
*
* ```php
* echo Breadcrumbs::widget([
* 'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : [],
* 'options' => [],
* ]);
* ```
* @see https://getbootstrap.com/docs/4.5/components/breadcrumb/
* @author Alexandr Kozhevnikov <onmotion1@gmail.com>
* @author Simon Karlen <simi.albi@outlook.com>
*/
class Breadcrumbs extends Widget
{
/**
* @var string the name of the breadcrumb container tag.
*/
public $tag = 'ol';
/**
* @var bool whether to HTML-encode the link labels.
*/
public $encodeLabels = true;
/**
* @var array the first hyperlink in the breadcrumbs (called home link).
* Please refer to [[links]] on the format of the link.
* If this property is not set, it will default to a link pointing to [[\yii\web\Application::homeUrl]]
* with the label 'Home'. If this property is false, the home link will not be rendered.
*/
public $homeLink;
/**
* @var array list of links to appear in the breadcrumbs. If this property is empty,
* the widget will not render anything. Each array element represents a single link in the breadcrumbs
* with the following structure:
*
* ```php
* [
* 'label' => 'label of the link', // required
* 'url' => 'url of the link', // optional, will be processed by Url::to()
* 'template' => 'own template of the item', // optional, if not set $this->itemTemplate will be used
* ]
* ```
*
*
*/
public $links = [];
/**
* @var string the template used to render each inactive item in the breadcrumbs. The token `{link}`
* will be replaced with the actual HTML link for each inactive item.
*/
public $itemTemplate = "<li class=\"breadcrumb-item\">{link}</li>\n";
/**
* @var string the template used to render each active item in the breadcrumbs. The token `{link}`
* will be replaced with the actual HTML link for each active item.
*/
public $activeItemTemplate = "<li class=\"breadcrumb-item active\" aria-current=\"page\">{link}</li>\n";
/**
* @var array the HTML attributes for the widgets nav container tag.
* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
*/
public $navOptions = ['aria-label' => 'breadcrumb'];
/**
* Initializes the widget.
* If you override this method, make sure you call the parent implementation first.
*/
public function init()
{
parent::init();
$this->clientOptions = false;
Html::addCssClass($this->options, ['widget' => 'breadcrumb']);
}
/**
* Renders the widget.
* @throws InvalidConfigException
*/
public function run()
{
$this->registerPlugin('breadcrumb');
if (empty($this->links)) {
return '';
}
$links = [];
if ($this->homeLink === null) {
$links[] = $this->renderItem([
'label' => Yii::t('yii', 'Home'),
'url' => Yii::$app->homeUrl,
], $this->itemTemplate);
} elseif ($this->homeLink !== false) {
$links[] = $this->renderItem($this->homeLink, $this->itemTemplate);
}
foreach ($this->links as $link) {
if (!is_array($link)) {
$link = ['label' => $link];
}
$links[] = $this->renderItem($link, isset($link['url']) ? $this->itemTemplate : $this->activeItemTemplate);
}
return Html::tag('nav', Html::tag($this->tag, implode('', $links), $this->options), $this->navOptions);
}
/**
* Renders a single breadcrumb item.
* @param array $link the link to be rendered. It must contain the "label" element. The "url" element is optional.
* @param string $template the template to be used to rendered the link. The token "{link}" will be replaced by the link.
* @return string the rendering result
* @throws InvalidConfigException if `$link` does not have "label" element.
*/
protected function renderItem($link, $template)
{
$encodeLabel = ArrayHelper::remove($link, 'encode', $this->encodeLabels);
if (array_key_exists('label', $link)) {
$label = $encodeLabel ? Html::encode($link['label']) : $link['label'];
} else {
throw new InvalidConfigException('The "label" element is required for each link.');
}
if (isset($link['template'])) {
$template = $link['template'];
}
if (isset($link['url'])) {
$options = $link;
unset($options['template'], $options['label'], $options['url']);
$link = Html::a($label, $link['url'], $options);
} else {
$link = $label;
}
return strtr($template, ['{link}' => $link]);
}
}
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