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Breadcrumbs, yii\widgets\Breadcrumbs | API Documentation for Yii 2.0

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,

echo Breadcrumbs::widget([
    'itemTemplate' => "<li><i>{link}</i></li>\n", 
    'links' => [
        [
            'label' => 'Post Category',
            'url' => ['post-category/view', 'id' => 10],
            'template' => "<li><b>{link}</b></li>\n", 
        ],
        ['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:

echo Breadcrumbs::widget([
    'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : [],
]);

Hide inherited properties

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.

Whether to HTML-encode the link labels.

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.

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.

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',  
    'url' => 'url of the link',      
    'template' => 'own template of the item', 
]

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' => 'https://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,
]

The name of the breadcrumb container tag.

Hide inherited methods

Defined in: yii\base\Component::__call()

Calls the named method which is not a class method.

This method will check if any attached behavior has the named method and will execute it if available.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

Source code

                public function __call($name, $params)
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $object) {
        if ($object->hasMethod($name)) {
            return call_user_func_array([$object, $name], $params);
        }
    }
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

            

Defined in: yii\base\Component::__clone()

This method is called after the object is created by cloning an existing one.

It removes all behaviors because they are attached to the old object.

Source code

                public function __clone()
{
    $this->_events = [];
    $this->_eventWildcards = [];
    $this->_behaviors = null;
}

            

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

• Initializes the object with the given configuration $config.
• Call init().

If this method is overridden in a child class, it is recommended that

• the last parameter of the constructor is a configuration array, like $config here.
• call the parent implementation at the end of the constructor.

Name-value pairs that will be used to initialize the object properties

Source code

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

            

Defined in: yii\base\Component::__get()

Returns the value of a component property.

This method will check in the following order and act accordingly:

• a property defined by a getter: return the getter result
• a property of a behavior: return the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $component->property;.

See also __set().

Source code

                public function __get($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        
        return $this->$getter();
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name;
        }
    }
    if (method_exists($this, 'set' . $name)) {
        throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
}

            

Defined in: yii\base\Component::__isset()

Checks if a property is set, i.e. defined and not null.

This method will check in the following order and act accordingly:

• a property defined by a setter: return whether the property is set
• a property of a behavior: return whether the property is set
• return false for non existing properties

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing isset($component->property).

See also https://www.php.net/manual/en/function.isset.php.

Source code

                public function __isset($name)
{
    $getter = 'get' . $name;
    if (method_exists($this, $getter)) {
        return $this->$getter() !== null;
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canGetProperty($name)) {
            return $behavior->$name !== null;
        }
    }
    return false;
}

            

Defined in: yii\base\Component::__set()

Sets the value of a component property.

This method will check in the following order and act accordingly:

• a property defined by a setter: set the property value
• an event in the format of "on xyz": attach the handler to the event "xyz"
• a behavior in the format of "as xyz": attach the behavior named as "xyz"
• a property of a behavior: set the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $component->property = $value;.

See also __get().

Source code

                public function __set($name, $value)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        
        $this->$setter($value);
        return;
    } elseif (strncmp($name, 'on ', 3) === 0) {
        
        $this->on(trim(substr($name, 3)), $value);
        return;
    } elseif (strncmp($name, 'as ', 3) === 0) {
        
        $name = trim(substr($name, 3));
        if ($value instanceof Behavior) {
            $this->attachBehavior($name, $value);
        } elseif ($value instanceof \Closure) {
            $this->attachBehavior($name, call_user_func($value));
        } elseif (isset($value['__class']) && is_subclass_of($value['__class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (!isset($value['__class']) && isset($value['class']) && is_subclass_of($value['class'], Behavior::class)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } elseif (is_string($value) && is_subclass_of($value, Behavior::class, true)) {
            $this->attachBehavior($name, Yii::createObject($value));
        } else {
            throw new InvalidConfigException('Class is not of type ' . Behavior::class . ' or its subclasses');
        }
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = $value;
            return;
        }
    }
    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
}

            

Defined in: yii\base\Component::__unset()

Sets a component property to be null.

This method will check in the following order and act accordingly:

• a property defined by a setter: set the property value to be null
• a property of a behavior: set the property value to be null

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing unset($component->property).

See also https://www.php.net/manual/en/function.unset.php.

Source code

                public function __unset($name)
{
    $setter = 'set' . $name;
    if (method_exists($this, $setter)) {
        $this->$setter(null);
        return;
    }
    
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $behavior) {
        if ($behavior->canSetProperty($name)) {
            $behavior->$name = null;
            return;
        }
    }
    throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
}

            

Defined in: yii\base\Widget::afterRun()

This method is invoked right after a widget is executed.

The method will trigger the EVENT_AFTER_RUN event. The return value of the method will be used as the widget return value.

If you override this method, your code should look like the following:

public function afterRun($result)
{
    $result = parent::afterRun($result);
    
    return $result;
}

The widget return result.

The processed widget result.

Source code

                public function afterRun($result)
{
    $event = new WidgetEvent();
    $event->result = $result;
    $this->trigger(self::EVENT_AFTER_RUN, $event);
    return $event->result;
}

            

Source code

                public function attachBehavior($name, $behavior)
{
    $this->ensureBehaviors();
    return $this->attachBehaviorInternal($name, $behavior);
}

            

List of behaviors to be attached to the component

Source code

                public function attachBehaviors($behaviors)
{
    $this->ensureBehaviors();
    foreach ($behaviors as $name => $behavior) {
        $this->attachBehaviorInternal($name, $behavior);
    }
}

            

Defined in: yii\base\Widget::beforeRun()

This method is invoked right before the widget is executed.

The method will trigger the EVENT_BEFORE_RUN event. The return value of the method will determine whether the widget should continue to run.

When overriding this method, make sure you call the parent implementation like the following:

public function beforeRun()
{
    if (!parent::beforeRun()) {
        return false;
    }

    

    return true; 
}

Source code

                public function beforeRun()
{
    $event = new WidgetEvent();
    $this->trigger(self::EVENT_BEFORE_RUN, $event);
    return $event->isValid;
}

            

Defined in: yii\base\Widget::begin()

Begins a widget.

This method creates an instance of the calling class. It will apply the configuration to the created instance. A matching end() call should be called later. As some widgets may use output buffering, the end() call should be made in the same view to avoid breaking the nesting of output buffers.

See also end().

Name-value pairs that will be used to initialize the object properties

The newly created widget instance

Source code

                public static function begin($config = [])
{
    $config['class'] = get_called_class();
    
    $widget = Yii::createObject($config);
    self::$stack[] = $widget;
    self::$_resolvedClasses[get_called_class()] = get_class($widget);
    return $widget;
}

            

Defined in: yii\base\Component::behaviors()

Returns a list of behaviors that this component should behave as.

Child classes may override this method to specify the behaviors they want to behave as.

The return value of this method should be an array of behavior objects or configurations indexed by behavior names. A behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName' => [
    'class' => 'BehaviorClass',
    'property1' => 'value1',
    'property2' => 'value2',
]

Note that a behavior class must extend from yii\base\Behavior. Behaviors can be attached using a name or anonymously. When a name is used as the array key, using this name, the behavior can later be retrieved using getBehavior() or be detached using detachBehavior(). Anonymous behaviors can not be retrieved or detached.

Behaviors declared in this method will be attached to the component automatically (on demand).

Source code

                public function behaviors()
{
    return [];
}

            

Defined in: yii\base\Component::canGetProperty()

Returns a value indicating whether a property can be read.

A property can be read if:

• the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
• the class has a member variable with the specified name (when $checkVars is true);
• an attached behavior has a readable property of the given name (when $checkBehaviors is true).

See also canSetProperty().

The property name

Whether to treat member variables as properties

Whether to treat behaviors' properties as properties of this component

Whether the property can be read

Source code

                public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canGetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            

Defined in: yii\base\Component::canSetProperty()

Returns a value indicating whether a property can be set.

A property can be written if:

• the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
• the class has a member variable with the specified name (when $checkVars is true);
• an attached behavior has a writable property of the given name (when $checkBehaviors is true).

See also canGetProperty().

The property name

Whether to treat member variables as properties

Whether to treat behaviors' properties as properties of this component

Whether the property can be written

Source code

                public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
{
    if (method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->canSetProperty($name, $checkVars)) {
                return true;
            }
        }
    }
    return false;
}

            

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Source code

                public static function className()
{
    return get_called_class();
}

            

Source code

                public function detachBehavior($name)
{
    $this->ensureBehaviors();
    if (isset($this->_behaviors[$name])) {
        $behavior = $this->_behaviors[$name];
        unset($this->_behaviors[$name]);
        $behavior->detach();
        return $behavior;
    }
    return null;
}

            

Source code

                public function detachBehaviors()
{
    $this->ensureBehaviors();
    foreach ($this->_behaviors as $name => $behavior) {
        $this->detachBehavior($name);
    }
}

            

Source code

                public static function end()
{
    if (!empty(self::$stack)) {
        $widget = array_pop(self::$stack);
        $calledClass = self::$_resolvedClasses[get_called_class()] ?? get_called_class();
        if (get_class($widget) === $calledClass) {
            
            if ($widget->beforeRun()) {
                $result = $widget->run();
                $result = $widget->afterRun($result);
                echo $result;
            }
            return $widget;
        }
        throw new InvalidCallException('Expecting end() of ' . get_class($widget) . ', found ' . get_called_class());
    }
    throw new InvalidCallException('Unexpected ' . get_called_class() . '::end() call. A matching begin() is not found.');
}

            

Source code

                public function ensureBehaviors()
{
    if ($this->_behaviors === null) {
        $this->_behaviors = [];
        foreach ($this->behaviors() as $name => $behavior) {
            $this->attachBehaviorInternal($name, $behavior);
        }
    }
}

            

Source code

                public function getBehavior($name)
{
    $this->ensureBehaviors();
    return isset($this->_behaviors[$name]) ? $this->_behaviors[$name] : null;
}

            

Source code

                public function getBehaviors()
{
    $this->ensureBehaviors();
    return $this->_behaviors;
}

            

Whether to generate an ID if it is not set previously

ID of the widget.

Source code

                public function getId($autoGenerate = true)
{
    if ($autoGenerate && $this->_id === null) {
        $this->_id = static::$autoIdPrefix . static::$counter++;
    }
    return $this->_id;
}

            

Defined in: yii\base\Widget::getView()

Returns the view object that can be used to render views or view files.

The render() and renderFile() methods will use this view object to implement the actual view rendering. If not set, it will default to the "view" application component.

Source code

                public function getView()
{
    if ($this->_view === null) {
        $this->_view = Yii::$app->getView();
    }
    return $this->_view;
}

            

Defined in: yii\base\Widget::getViewPath()

Returns the directory containing the view files for this widget.

The default implementation returns the 'views' subdirectory under the directory containing the widget class file.

Source code

                public function getViewPath()
{
    $class = new ReflectionClass($this);
    return dirname($class->getFileName()) . DIRECTORY_SEPARATOR . 'views';
}

            

Source code

                public function hasEventHandlers($name)
{
    $this->ensureBehaviors();
    if (!empty($this->_events[$name])) {
        return true;
    }
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
            return true;
        }
    }
    return Event::hasHandlers($this, $name);
}

            

Defined in: yii\base\Component::hasMethod()

Returns a value indicating whether a method is defined.

A method is defined if:

• the class has a method with the specified name
• an attached behavior has a method with the given name (when $checkBehaviors is true).

The property name

Whether to treat behaviors' methods as methods of this component

Whether the method is defined

Source code

                public function hasMethod($name, $checkBehaviors = true)
{
    if (method_exists($this, $name)) {
        return true;
    } elseif ($checkBehaviors) {
        $this->ensureBehaviors();
        foreach ($this->_behaviors as $behavior) {
            if ($behavior->hasMethod($name)) {
                return true;
            }
        }
    }
    return false;
}

            

Defined in: yii\base\Component::hasProperty()

Returns a value indicating whether a property is defined for this component.

A property is defined if:

• the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
• the class has a member variable with the specified name (when $checkVars is true);
• an attached behavior has a property of the given name (when $checkBehaviors is true).

See also:

• canGetProperty()
• canSetProperty()

The property name

Whether to treat member variables as properties

Whether to treat behaviors' properties as properties of this component

Whether the property is defined

Source code

                public function hasProperty($name, $checkVars = true, $checkBehaviors = true)
{
    return $this->canGetProperty($name, $checkVars, $checkBehaviors) || $this->canSetProperty($name, false, $checkBehaviors);
}

            

Defined in: yii\base\Widget::init()

Initializes the object.

This method is called at the end of the constructor. The default implementation will trigger an EVENT_INIT event.

Source code

                public function init()
{
    parent::init();
    $this->trigger(self::EVENT_INIT);
}

            

Defined in: yii\base\Component::off()

Detaches an existing event handler from this component.

This method is the opposite of on().

Note: in case wildcard pattern is passed for event name, only the handlers registered with this wildcard will be removed, while handlers registered with plain names matching this wildcard will remain.

See also on().

Event name

The event handler to be removed. If it is null, all handlers attached to the named event will be removed.

If a handler is found and detached

Source code

                public function off($name, $handler = null)
{
    $this->ensureBehaviors();
    if (empty($this->_events[$name]) && empty($this->_eventWildcards[$name])) {
        return false;
    }
    if ($handler === null) {
        unset($this->_events[$name], $this->_eventWildcards[$name]);
        return true;
    }
    $removed = false;
    
    if (isset($this->_events[$name])) {
        foreach ($this->_events[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_events[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_events[$name] = array_values($this->_events[$name]);
            return true;
        }
    }
    
    if (isset($this->_eventWildcards[$name])) {
        foreach ($this->_eventWildcards[$name] as $i => $event) {
            if ($event[0] === $handler) {
                unset($this->_eventWildcards[$name][$i]);
                $removed = true;
            }
        }
        if ($removed) {
            $this->_eventWildcards[$name] = array_values($this->_eventWildcards[$name]);
            
            if (empty($this->_eventWildcards[$name])) {
                unset($this->_eventWildcards[$name]);
            }
        }
    }
    return $removed;
}

            

Defined in: yii\base\Component::on()

Attaches an event handler to an event.

The event handler must be a valid PHP callback. The following are some examples:

function ($event) { ... }         
[$object, 'handleClick']          
['Page', 'handleClick']           
'handleClick'                     

The event handler must be defined with the following signature,

function ($event)

where $event is an yii\base\Event object which includes parameters associated with the event.

Since 2.0.14 you can specify event name as a wildcard pattern:

$component->on('event.group.*', function ($event) {
    Yii::trace($event->name . ' is triggered.');
});

See also off().

The event name

The event handler

The data to be passed to the event handler when the event is triggered. When the event handler is invoked, this data can be accessed via yii\base\Event::$data.

Whether to append new event handler to the end of the existing handler list. If false, the new handler will be inserted at the beginning of the existing handler list.

Source code

                public function on($name, $handler, $data = null, $append = true)
{
    $this->ensureBehaviors();
    if (strpos($name, '*') !== false) {
        if ($append || empty($this->_eventWildcards[$name])) {
            $this->_eventWildcards[$name][] = [$handler, $data];
        } else {
            array_unshift($this->_eventWildcards[$name], [$handler, $data]);
        }
        return;
    }
    if ($append || empty($this->_events[$name])) {
        $this->_events[$name][] = [$handler, $data];
    } else {
        array_unshift($this->_events[$name], [$handler, $data]);
    }
}

            

Defined in: yii\base\Widget::render()

Renders a view.

The view to be rendered can be specified in one of the following formats:

• path alias (e.g. "@app/views/site/index");
• absolute path within application (e.g. "//site/index"): the view name starts with double slashes. The actual view file will be looked for under the view path of the application.
• absolute path within module (e.g. "/site/index"): the view name starts with a single slash. The actual view file will be looked for under the view path of the currently active module.
• relative path (e.g. "index"): the actual view file will be looked for under $viewPath.

If the view name does not contain a file extension, it will use the default one .php.

Source code

                public function render($view, $params = [])
{
    return $this->getView()->render($view, $params, $this);
}

            

Source code

                public function renderFile($file, $params = [])
{
    return $this->getView()->renderFile($file, $params, $this);
}

            

Renders a single breadcrumb item.

The link to be rendered. It must contain the "label" element. The "url" element is optional.

The template to be used to rendered the link. The token "{link}" will be replaced by the link.

The rendering result

if $link does not have "label" element.

Source code

                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]);
}

            

Renders the widget.

Source code

                public function run()
{
    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 : $this->activeItemTemplate);
    }
    echo Html::tag($this->tag, implode('', $links), $this->options);
}

            

Id of the widget.

Source code

                public function setId($value)
{
    $this->_id = $value;
}

            

The view object that can be used to render views or view files.

Source code

                public function setView($view)
{
    $this->_view = $view;
}

            

Defined in: yii\base\Component::trigger()

Triggers an event.

This method represents the happening of an event. It invokes all attached handlers for the event including class-level handlers.

Source code

                public function trigger($name, ?Event $event = null)
{
    $this->ensureBehaviors();
    $eventHandlers = [];
    foreach ($this->_eventWildcards as $wildcard => $handlers) {
        if (StringHelper::matchWildcard($wildcard, $name)) {
            $eventHandlers[] = $handlers;
        }
    }
    if (!empty($this->_events[$name])) {
        $eventHandlers[] = $this->_events[$name];
    }
    if (!empty($eventHandlers)) {
        $eventHandlers = call_user_func_array('array_merge', $eventHandlers);
        if ($event === null) {
            $event = new Event();
        }
        if ($event->sender === null) {
            $event->sender = $this;
        }
        $event->handled = false;
        $event->name = $name;
        foreach ($eventHandlers as $handler) {
            $event->data = $handler[1];
            call_user_func($handler[0], $event);
            
            if ($event->handled) {
                return;
            }
        }
    }
    
    Event::trigger($this, $name, $event);
}

            

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