API Documentation for Yii 2.0

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Class yii\widgets\Breadcrumbs

All Classes | Properties | Methods | Events

Inheritance	yii\widgets\Breadcrumbs » yii\base\Widget » yii\base\Component » yii\base\BaseObject
Implements	yii\base\Configurable, yii\base\ViewContextInterface
Available since version	2.0
Source Code	https://github.com/yiisoft/yii2/blob/master/framework/widgets/Breadcrumbs.php

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 specifies the links to be displayed. For example,

// $this is the view object currently being used
echo Breadcrumbs::widget([
    'itemTemplate' => "<li><i>{link}</i></li>\n", // template for all links
    'links' => [
        [
            'label' => 'Post Category',
            'url' => ['post-category/view', 'id' => 10],
            'template' => "<li><b>{link}</b></li>\n", // template for this link only
        ],
        ['label' => 'Sample Post', 'url' => ['post/edit', 'id' => 1]],
        'Edit',
    ],
]);

Because breadcrumbs usually appears in nearly every page of a website, you may consider placing it in a layout view. You can 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:

// $this is the view object currently being used
echo Breadcrumbs::widget([
    'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : [],
]);

Public Properties

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Property	Type	Description	Defined By
$activeItemTemplate	string	The template used to render each active item in the breadcrumbs.	yii\widgets\Breadcrumbs
$autoIdPrefix	string	The prefix to the automatically generated widget IDs.	yii\base\Widget
$behaviors	yii\base\Behavior[]	List of behaviors attached to this component	yii\base\Component
$counter	integer	A counter used to generate $id for widgets.	yii\base\Widget
$encodeLabels	boolean	Whether to HTML-encode the link labels.	yii\widgets\Breadcrumbs
$homeLink	array	The first hyperlink in the breadcrumbs (called home link).	yii\widgets\Breadcrumbs
$id	string	ID of the widget.	yii\base\Widget
$itemTemplate	string	The template used to render each inactive item in the breadcrumbs.	yii\widgets\Breadcrumbs
$links	array	List of links to appear in the breadcrumbs.	yii\widgets\Breadcrumbs
$options	array	The HTML attributes for the breadcrumb container tag.	yii\widgets\Breadcrumbs
$stack	yii\base\Widget[]	The widgets that are currently being rendered (not ended).	yii\base\Widget
$tag	string	The name of the breadcrumb container tag.	yii\widgets\Breadcrumbs
$view	yii\web\View	The view object that can be used to render views or view files.	yii\base\Widget
$viewPath	string	The directory containing the view files for this widget.	yii\base\Widget

Public Methods

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Method	Description	Defined By
__call()	Calls the named method which is not a class method.	yii\base\Component
__clone()	This method is called after the object is created by cloning an existing one.	yii\base\Component
__construct()	Constructor.	yii\base\BaseObject
__get()	Returns the value of a component property.	yii\base\Component
__isset()	Checks if a property is set, i.e. defined and not null.	yii\base\Component
__set()	Sets the value of a component property.	yii\base\Component
__unset()	Sets a component property to be null.	yii\base\Component
afterRun()	This method is invoked right after a widget is executed.	yii\base\Widget
attachBehavior()	Attaches a behavior to this component.	yii\base\Component
attachBehaviors()	Attaches a list of behaviors to the component.	yii\base\Component
beforeRun()	This method is invoked right before the widget is executed.	yii\base\Widget
begin()	Begins a widget.	yii\base\Widget
behaviors()	Returns a list of behaviors that this component should behave as.	yii\base\Component
canGetProperty()	Returns a value indicating whether a property can be read.	yii\base\Component
canSetProperty()	Returns a value indicating whether a property can be set.	yii\base\Component
className()	Returns the fully qualified name of this class.	yii\base\BaseObject
detachBehavior()	Detaches a behavior from the component.	yii\base\Component
detachBehaviors()	Detaches all behaviors from the component.	yii\base\Component
end()	Ends a widget.	yii\base\Widget
ensureBehaviors()	Makes sure that the behaviors declared in behaviors() are attached to this component.	yii\base\Component
getBehavior()	Returns the named behavior object.	yii\base\Component
getBehaviors()	Returns all behaviors attached to this component.	yii\base\Component
getId()	Returns the ID of the widget.	yii\base\Widget
getView()	Returns the view object that can be used to render views or view files.	yii\base\Widget
getViewPath()	Returns the directory containing the view files for this widget.	yii\base\Widget
hasEventHandlers()	Returns a value indicating whether there is any handler attached to the named event.	yii\base\Component
hasMethod()	Returns a value indicating whether a method is defined.	yii\base\Component
hasProperty()	Returns a value indicating whether a property is defined for this component.	yii\base\Component
init()	Initializes the object.	yii\base\Widget
off()	Detaches an existing event handler from this component.	yii\base\Component
on()	Attaches an event handler to an event.	yii\base\Component
render()	Renders a view.	yii\base\Widget
renderFile()	Renders a view file.	yii\base\Widget
run()	Renders the widget.	yii\widgets\Breadcrumbs
setId()	Sets the ID of the widget.	yii\base\Widget
setView()	Sets the view object to be used by this widget.	yii\base\Widget
trigger()	Triggers an event.	yii\base\Component
widget()	Creates a widget instance and runs it.	yii\base\Widget

Protected Methods

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Method	Description	Defined By
renderItem()	Renders a single breadcrumb item.	yii\widgets\Breadcrumbs

Events

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Event	Type	Description	Defined By
EVENT_AFTER_RUN	yii\base\WidgetEvent	An event raised right after executing a widget. (available since version 2.0.11)	yii\base\Widget
EVENT_BEFORE_RUN	yii\base\WidgetEvent	An event raised right before executing a widget. (available since version 2.0.11)	yii\base\Widget
EVENT_INIT	yii\base\Event	An event that is triggered when the widget is initialized via init(). (available since version 2.0.11)	yii\base\Widget

Property Details

$activeItemTemplate public property

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 string $activeItemTemplate = "<li class=\"active\">{link}</li>\n"

$encodeLabels public property

Whether to HTML-encode the link labels.

public boolean $encodeLabels = true

$homeLink public property

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 array $homeLink = null

$itemTemplate public property

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 string $itemTemplate = "<li>{link}</li>\n"

$links public property

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:

[
    '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
]

If a link is active, you only need to specify its "label", and instead of writing ['label' => $label], you may simply use $label.

Since version 2.0.1, any additional array elements for each link will be treated as the HTML attributes for the hyperlink tag. For example, the following link specification will generate a hyperlink with CSS class external:

[
    'label' => 'demo',
    'url' => 'http://example.com',
    'class' => 'external',
]

Since version 2.0.3 each individual link can override global $encodeLabels param like the following:

[
    'label' => '<strong>Hello!</strong>',
    'encode' => false,
]

public array $links = []

$options public property

The HTML attributes for the breadcrumb container tag.

See also yii\helpers\Html::renderTagAttributes() for details on how attributes are being rendered.

public array $options = ['class' => 'breadcrumb']

$tag public property

The name of the breadcrumb container tag.

public string $tag = 'ul'

Method Details

renderItem() protected method

Renders a single breadcrumb item.

protected string renderItem ( $link, $template )
$link	array	The link to be rendered. It must contain the "label" element. The "url" element is optional.
$template	string	The template to be used to rendered the link. The token "{link}" will be replaced by the link.
return	string	The rendering result
throws	yii\base\InvalidConfigException	if `$link` does not have "label" element.

run() public method

Renders the widget.

public void run ( )

User Contributed Notes