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vendor/yiisoft/yii2/widgets/Breadcrumbs.php
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181
vendor/yiisoft/yii2/widgets/Breadcrumbs.php
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\widgets;
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use Yii;
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use yii\base\InvalidConfigException;
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use yii\base\Widget;
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use yii\helpers\ArrayHelper;
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use yii\helpers\Html;
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/**
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* Breadcrumbs displays a list of links indicating the position of the current page in the whole site hierarchy.
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*
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* For example, breadcrumbs like "Home / Sample Post / Edit" means the user is viewing an edit page
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* for the "Sample Post". He can click on "Sample Post" to view that page, or he can click on "Home"
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* to return to the homepage.
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*
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* To use Breadcrumbs, you need to configure its [[links]] property, which specifies the links to be displayed. For example,
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*
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* ```php
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* // $this is the view object currently being used
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* echo Breadcrumbs::widget([
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* 'itemTemplate' => "<li><i>{link}</i></li>\n", // template for all links
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* 'links' => [
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* [
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* 'label' => 'Post Category',
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* 'url' => ['post-category/view', 'id' => 10],
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* 'template' => "<li><b>{link}</b></li>\n", // template for this link only
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* ],
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* ['label' => 'Sample Post', 'url' => ['post/edit', 'id' => 1]],
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* 'Edit',
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* ],
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* ]);
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* ```
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*
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* Because breadcrumbs usually appears in nearly every page of a website, you may consider placing it in a layout view.
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* You can use a view parameter (e.g. `$this->params['breadcrumbs']`) to configure the links in different
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* views. In the layout view, you assign this view parameter to the [[links]] property like the following:
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*
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* ```php
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* // $this is the view object currently being used
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* echo Breadcrumbs::widget([
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* 'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : [],
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* ]);
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* ```
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Breadcrumbs extends Widget
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{
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/**
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* @var string the name of the breadcrumb container tag.
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*/
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public $tag = 'ul';
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/**
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* @var array the HTML attributes for the breadcrumb container tag.
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* @see \yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.
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*/
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public $options = ['class' => 'breadcrumb'];
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/**
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* @var bool whether to HTML-encode the link labels.
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*/
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public $encodeLabels = true;
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/**
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* @var array the first hyperlink in the breadcrumbs (called home link).
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* Please refer to [[links]] on the format of the link.
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* If this property is not set, it will default to a link pointing to [[\yii\web\Application::homeUrl]]
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* with the label 'Home'. If this property is false, the home link will not be rendered.
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*/
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public $homeLink;
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/**
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* @var array list of links to appear in the breadcrumbs. If this property is empty,
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* the widget will not render anything. Each array element represents a single link in the breadcrumbs
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* with the following structure:
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*
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* ```php
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* [
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* 'label' => 'label of the link', // required
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* 'url' => 'url of the link', // optional, will be processed by Url::to()
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* 'template' => 'own template of the item', // optional, if not set $this->itemTemplate will be used
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* ]
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* ```
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*
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* If a link is active, you only need to specify its "label", and instead of writing `['label' => $label]`,
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* you may simply use `$label`.
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*
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* Since version 2.0.1, any additional array elements for each link will be treated as the HTML attributes
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* for the hyperlink tag. For example, the following link specification will generate a hyperlink
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* with CSS class `external`:
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*
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* ```php
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* [
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* 'label' => 'demo',
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* 'url' => 'http://example.com',
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* 'class' => 'external',
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* ]
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* ```
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*
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* Since version 2.0.3 each individual link can override global [[encodeLabels]] param like the following:
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*
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* ```php
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* [
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* 'label' => '<strong>Hello!</strong>',
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* 'encode' => false,
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* ]
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* ```
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*/
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public $links = [];
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/**
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* @var string the template used to render each inactive item in the breadcrumbs. The token `{link}`
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* will be replaced with the actual HTML link for each inactive item.
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*/
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public $itemTemplate = "<li>{link}</li>\n";
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/**
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* @var string the template used to render each active item in the breadcrumbs. The token `{link}`
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* will be replaced with the actual HTML link for each active item.
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*/
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public $activeItemTemplate = "<li class=\"active\">{link}</li>\n";
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/**
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* Renders the widget.
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*/
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public function run()
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{
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if (empty($this->links)) {
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return;
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}
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$links = [];
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if ($this->homeLink === null) {
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$links[] = $this->renderItem([
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'label' => Yii::t('yii', 'Home'),
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'url' => Yii::$app->homeUrl,
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], $this->itemTemplate);
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} elseif ($this->homeLink !== false) {
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$links[] = $this->renderItem($this->homeLink, $this->itemTemplate);
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}
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foreach ($this->links as $link) {
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if (!is_array($link)) {
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$link = ['label' => $link];
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}
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$links[] = $this->renderItem($link, isset($link['url']) ? $this->itemTemplate : $this->activeItemTemplate);
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}
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echo Html::tag($this->tag, implode('', $links), $this->options);
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}
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/**
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* Renders a single breadcrumb item.
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* @param array $link the link to be rendered. It must contain the "label" element. The "url" element is optional.
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* @param string $template the template to be used to rendered the link. The token "{link}" will be replaced by the link.
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* @return string the rendering result
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* @throws InvalidConfigException if `$link` does not have "label" element.
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*/
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protected function renderItem($link, $template)
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{
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$encodeLabel = ArrayHelper::remove($link, 'encode', $this->encodeLabels);
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if (array_key_exists('label', $link)) {
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$label = $encodeLabel ? Html::encode($link['label']) : $link['label'];
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} else {
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throw new InvalidConfigException('The "label" element is required for each link.');
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}
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if (isset($link['template'])) {
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$template = $link['template'];
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}
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if (isset($link['url'])) {
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$options = $link;
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unset($options['template'], $options['label'], $options['url']);
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$link = Html::a($label, $link['url'], $options);
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} else {
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$link = $label;
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}
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return strtr($template, ['{link}' => $link]);
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}
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}
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