Event ​
- Type
- Class
- Namespace
- craft\base
- Inherits
- craft\base\Event » yii\base\Event » yii\base\BaseObject
- Implements
- yii\base\Configurable
- Extended by
- craft\events\AssetBundleEvent
- Since
- 4.4.0
ElementTrait implements the common methods and properties for element classes.
Public Properties ​
| Property | Description |
|---|---|
| data | mixed – The data that is passed to yii\base\Component::on() when attaching an event handler. |
| handled | boolean – Whether the event is handled. |
| name | string – The event name. |
| sender | object, null – The sender of this event. |
Public Methods ​
| Method | Description |
|---|---|
| __call() | Calls the named method which is not a class method. |
| __construct() | Constructor. |
| __get() | Returns the value of an object property. |
| __isset() | Checks if a property is set, i.e. defined and not null. |
| __set() | Sets value of an object property. |
| __unset() | Sets an object property to null. |
| canGetProperty() | Returns a value indicating whether a property can be read. |
| canSetProperty() | Returns a value indicating whether a property can be set. |
| className() | Returns the fully qualified name of this class. |
| hasHandlers() | Returns a value indicating whether there is any handler attached to the specified class-level event. |
| hasMethod() | Returns a value indicating whether a method is defined. |
| hasProperty() | Returns a value indicating whether a property is defined. |
| init() | Initializes the object. |
| off() | Detaches an event handler from a class-level event. |
| offAll() | Detaches all registered class-level event handlers. |
| on() | Attaches an event handler to a class-level event. |
| once() | Attaches an event handler to a class-level event, which will be triggered at most one time. |
| trigger() | Triggers a class-level event. |
once() ​
Attaches an event handler to a class-level event, which will be triggered at most one time.
See also on()View source
Arguments ​
$class(string) – The fully qualified class name to which the event handler needs to attach.$name(string) – The event name.$handler(callable) – The event handler.$data(mixed) – 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::$data.$append(boolean) – Whether to append new event handler to the end of the existing handler list. Iffalse, the new handler will be inserted at the beginning of the existing handler list.