Class yii\bootstrap\Dropdown

All Classes | Properties | Methods

Inheritance	yii\bootstrap\Dropdown » yii\bootstrap\Widget » yii\base\Widget
Uses Traits	yii\bootstrap\BootstrapWidgetTrait
Available since extension's version	2.0
Source Code	https://github.com/yiisoft/yii2-bootstrap/blob/master/src/Dropdown.php

Dropdown renders a Bootstrap dropdown menu component.

For example,

<div class="dropdown"> <a href="#" data-toggle="dropdown" class="dropdown-toggle">Label <b class="caret"></b></a> <?php echo Dropdown::widget([ 'items' => [ ['label' => 'DropdownA', 'url' => '/'], ['label' => 'DropdownB', 'url' => '#'], ], ]); ?> </div>

Public Properties

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Property	Type	Description	Defined By
$clientEvents	array	The event handlers for the underlying Bootstrap JS plugin.	yii\bootstrap\BootstrapWidgetTrait
$clientOptions	array	The options for the underlying Bootstrap JS plugin.	yii\bootstrap\BootstrapWidgetTrait
$encodeLabels	boolean	Whether the labels for header items should be HTML-encoded.	yii\bootstrap\Dropdown
$items	array	List of menu items in the dropdown.	yii\bootstrap\Dropdown
$options	array	The HTML attributes for the widget container tag.	yii\bootstrap\Widget
$submenuOptions	array\|null	The HTML attributes for sub-menu container tags.	yii\bootstrap\Dropdown

Public Methods

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Method	Description	Defined By
getView()		yii\bootstrap\BootstrapWidgetTrait
init()	Initializes the widget.	yii\bootstrap\Dropdown
run()	Renders the widget.	yii\bootstrap\Dropdown

Protected Methods

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Method	Description	Defined By
registerClientEvents()	Registers JS event handlers that are listed in $clientEvents.	yii\bootstrap\BootstrapWidgetTrait
registerPlugin()	Registers a specific Bootstrap plugin and the related events	yii\bootstrap\BootstrapWidgetTrait
renderItems()	Renders menu items.	yii\bootstrap\Dropdown

Property Details

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$encodeLabels public property

Whether the labels for header items should be HTML-encoded.

public boolean $encodeLabels = true

$items public property

List of menu items in the dropdown. Each array element can be either an HTML string, or an array representing a single menu with the following structure:

label: string, required, the label of the item link.
encode: bool, optional, whether to HTML-encode item label.
url: string|array, optional, the URL of the item link. This will be processed by \yii\helpers\Url::to(). If not set, the item will be treated as a menu header when the item has no sub-menu.
visible: bool, optional, whether this menu item is visible. Defaults to true.
linkOptions: array, optional, the HTML attributes of the item link.
options: array, optional, the HTML attributes of the item.
items: array, optional, the submenu items. The structure is the same as this property. Note that Bootstrap doesn't support dropdown submenu. You have to add your own CSS styles to support it.
submenuOptions: array, optional, the HTML attributes for sub-menu container tag. If specified it will be merged with $submenuOptions.

To insert divider use <li role="presentation" class="divider"></li>.

public array $items = []

$submenuOptions public property (available since version 2.0.5)

The HTML attributes for sub-menu container tags. If not set - $options value will be used for it.

public array|null $submenuOptions = null

Method Details

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getView() public abstract method

Defined in: yii\bootstrap\BootstrapWidgetTrait::getView()

See also \yii\base\Widget::getView().

public abstract \yii\web\View getView ( )
return	\yii\web\View	The view object that can be used to render views or view files.

Source code

 abstract function getView();

init() public method

Initializes the widget.

If you override this method, make sure you call the parent implementation first.

public mixed init ( )

Source code

 public function init() { if ($this->submenuOptions === null) { // copying of [[options]] kept for BC // @todo separate [[submenuOptions]] from [[options]] completely before 2.1 release $this->submenuOptions = $this->options; unset($this->submenuOptions['id']); } parent::init(); Html::addCssClass($this->options, ['widget' => 'dropdown-menu']); }

registerClientEvents() protected method (available since version 2.0.2)

Defined in: yii\bootstrap\BootstrapWidgetTrait::registerClientEvents()

Registers JS event handlers that are listed in $clientEvents.

protected mixed registerClientEvents ( )

Source code

 protected function registerClientEvents() { if (!empty($this->clientEvents)) { $id = $this->options['id']; $js = []; foreach ($this->clientEvents as $event => $handler) { $js[] = "jQuery('#$id').on('$event', $handler);"; } $this->getView()->registerJs(implode("\n", $js)); } }

registerPlugin() protected method

Defined in: yii\bootstrap\BootstrapWidgetTrait::registerPlugin()

Registers a specific Bootstrap plugin and the related events

protected mixed registerPlugin ( string $name )
$name	string	The name of the Bootstrap plugin

Source code

 protected function registerPlugin($name) { $view = $this->getView(); BootstrapPluginAsset::register($view); $id = $this->options['id']; if ($this->clientOptions !== false) { $options = empty($this->clientOptions) ? '' : Json::htmlEncode($this->clientOptions); $js = "jQuery('#$id').$name($options);"; $view->registerJs($js); } $this->registerClientEvents(); }

renderItems() protected method

Renders menu items.

protected string renderItems ( array $items, array $options = [] )
$items	array	The menu items to be rendered
$options	array	The container HTML attributes
return	string	The rendering result.
throws	\yii\base\InvalidConfigException	if the label option is not specified in one of the items.

Source code

 protected function renderItems($items, $options = []) { $lines = []; foreach ($items as $item) { if (is_string($item)) { $lines[] = $item; continue; } if (isset($item['visible']) && !$item['visible']) { continue; } if (!array_key_exists('label', $item)) { throw new InvalidConfigException("The 'label' option is required."); } $encodeLabel = isset($item['encode']) ? $item['encode'] : $this->encodeLabels; $label = $encodeLabel ? Html::encode($item['label']) : $item['label']; $itemOptions = ArrayHelper::getValue($item, 'options', []); $linkOptions = ArrayHelper::getValue($item, 'linkOptions', []); $linkOptions['tabindex'] = '-1'; $url = array_key_exists('url', $item) ? $item['url'] : null; if (empty($item['items'])) { if ($url === null) { $content = $label; Html::addCssClass($itemOptions, ['widget' => 'dropdown-header']); } else { $content = Html::a($label, $url, $linkOptions); } } else { $submenuOptions = $this->submenuOptions; if (isset($item['submenuOptions'])) { $submenuOptions = array_merge($submenuOptions, $item['submenuOptions']); } $content = Html::a($label, $url === null ? '#' : $url, $linkOptions) . $this->renderItems($item['items'], $submenuOptions); Html::addCssClass($itemOptions, ['widget' => 'dropdown-submenu']); } $lines[] = Html::tag('li', $content, $itemOptions); } return Html::tag('ul', implode("\n", $lines), $options); }

run() public method

Renders the widget.

public mixed run ( )

Source code

 public function run() { BootstrapPluginAsset::register($this->getView()); $this->registerClientEvents(); return $this->renderItems($this->items, $this->options); }