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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\widgets;
use Yii;
use yii\base\Widget;
use yii\base\InvalidConfigException;
use yii\helpers\Html;
/**
* Breadcrumbs displays a list of links indicating the position of the current page in the whole site hierarchy.
*
* For example, breadcrumbs like "Home / Sample Post / Edit" means the user is viewing an edit page
* for the "Sample Post". He can click on "Sample Post" to view that page, or he can click on "Home"
* to return to the homepage.
*
* To use Breadcrumbs, you need to configure its [[links]] property, which specifiesthe links to be displayed. For example,
*
* ~~~
* $this->widget('yii\widgets\Breadcrumbs', array(
* 'links' => array(
* array('label' => 'Sample Post', 'url' => array('post/edit', 'id' => 1)),
* 'Edit',
* ),
* ));
* ~~~
*
* Because breadcrumbs usually appears in nearly every page of a website, you may consider place it in a layout view.
* You can then use a view parameter (e.g. `$this->params['breadcrumbs']`) to configure the links in different
* views. In the layout view, you assign this view parameter to the [[links]] property like the following:
*
* ~~~
* $this->widget('yii\widgets\Breadcrumbs', array(
* 'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : array(),
* ));
* ~~~
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Breadcrumbs extends Widget
{
/**
* @var array the HTML attributes for the breadcrumb container tag. The "tag" element is
* specially handled which specifies the tag name of the container element. If not set, it will default to "ul".
*/
public $options = array('tag' => 'ul', 'class' => 'breadcrumb');
/**
* @var boolean whether to HTML-encode the link labels.
*/
public $encodeLabels = true;
/**
* @var string the first hyperlink in the breadcrumbs (called home 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:
*
* ~~~
* array(
* 'label' => 'label of the link', // required
* 'url' => 'url of the link', // optional, will be processed by Html::url()
* )
* ~~~
*
* If a link is active, you only need to specify its "label", and instead of writing `array('label' => $label)`,
* you should simply use `$label`.
*/
public $links = array();
/**
* @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>{link} <span class=\"divider\">/</span></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 $activeItemTemplate = "<li class=\"active\">{link}</li>\n";
/**
* Renders the widget.
*/
public function run()
{
if (empty($this->links)) {
return;
}
$links = array();
if ($this->homeLink === null) {
$links[] = strtr($this->itemTemplate, array('{link}' => Html::a(Yii::t('yii|Home'), Yii::$app->homeUrl)));
} elseif ($this->homeLink !== false) {
$links[] = strtr($this->itemTemplate, array('{link}' => $this->homeLink));
}
foreach ($this->links as $link) {
if (!is_array($link)) {
$link = array('label' => $link);
}
if (isset($link['label'])) {
$label = $this->encodeLabels ? Html::encode($link['label']) : $link['label'];
} else {
throw new InvalidConfigException('The "label" element is required for each link.');
}
if (isset($link['url'])) {
$links[] = strtr($this->itemTemplate, array('{link}' => Html::a($label, $link['url'])));
} else {
$links[] = strtr($this->activeItemTemplate, array('{link}' => $label));
}
}
$tagName = isset($this->options['tag']) ? $this->options['tag'] : 'ul';
unset($this->options['tag']);
echo Html::tag($tagName, implode('', $links), $this->options);
}
}