# Class yii\data\ActiveDataProvider

Inheritance | yii\data\ActiveDataProvider » yii\data\BaseDataProvider » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable, yii\data\DataProviderInterface
Subclasses | yii\elasticsearch\ActiveDataProvider, yii\sphinx\ActiveDataProvider
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/data/ActiveDataProvider.php

ActiveDataProvider implements a data provider based on yii\db\Query and yii\db\ActiveQuery.

ActiveDataProvider provides data by performing DB queries using $query.

The following is an example of using ActiveDataProvider to provide ActiveRecord instances:

    $provider = new ActiveDataProvider([
        'query' => Post::find(),
        'pagination' => [
            'pageSize' => 20,
        ],
    ]);

    // get the posts in the current page
    $posts = $provider->getModels();

And the following example shows how to use ActiveDataProvider without ActiveRecord:

    $query = new Query();
    $provider = new ActiveDataProvider([
        'query' => $query->from('post'),
        'pagination' => [
            'pageSize' => 20,
        ],
    ]);

    // get the posts in the current page
    $posts = $provider->getModels();

For more details and usage information on ActiveDataProvider, see the guide article on data providers.

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. | yii\base\Component
$count | integer | The number of data models in the current page. | yii\data\BaseDataProvider
$db | yii\db\Connection|array|string|null | The DB connection object or the application component ID of the DB connection. | yii\data\ActiveDataProvider
$id | string|null | An ID that uniquely identifies the data provider among all data providers. | yii\data\BaseDataProvider
$key | string|callable|null | The column that is used as the key of the data models. | yii\data\ActiveDataProvider
$keys | array | The list of key values corresponding to $models. | yii\data\BaseDataProvider
$models | array | The list of data models in the current page. | yii\data\BaseDataProvider
$pagination | yii\data\Pagination|false | The pagination object. | yii\data\BaseDataProvider
$query | yii\db\QueryInterface|null | The query that is used to fetch data models and $totalCount if it is not explicitly set. | yii\data\ActiveDataProvider
$sort | yii\data\Sort|boolean | The sorting object. | yii\data\BaseDataProvider
$totalCount | integer | Total number of possible data models. | yii\data\BaseDataProvider

## Public Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\Component
__clone() |  | yii\data\ActiveDataProvider
__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
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
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
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
getCount() | Returns the number of data models in the current page. | yii\data\BaseDataProvider
getKeys() | Returns the key values associated with the data models. | yii\data\BaseDataProvider
getModels() | Returns the data models in the current page. | yii\data\BaseDataProvider
getPagination() | Returns the pagination object used by this data provider. | yii\data\BaseDataProvider
getSort() | Returns the sorting object used by this data provider. | yii\data\BaseDataProvider
getTotalCount() | Returns the total number of data models. | yii\data\BaseDataProvider
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 DB connection component. | yii\data\ActiveDataProvider
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
prepare() | Prepares the data models and keys. | yii\data\BaseDataProvider
refresh() | Refreshes the data provider. | yii\data\BaseDataProvider
setKeys() | Sets the key values associated with the data models. | yii\data\BaseDataProvider
setModels() | Sets the data models in the current page. | yii\data\BaseDataProvider
setPagination() | Sets the pagination for this data provider. | yii\data\BaseDataProvider
setSort() | Sets the sort definition for this data provider. | yii\data\ActiveDataProvider
setTotalCount() | Sets the total number of data models. | yii\data\BaseDataProvider
trigger() | Triggers an event. | yii\base\Component

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
prepareKeys() | Prepares the keys associated with the currently available data models. | yii\data\ActiveDataProvider
prepareModels() | Prepares the data models that will be made available in the current page. | yii\data\ActiveDataProvider
prepareTotalCount() | Returns a value indicating the total number of data models in this data provider. | yii\data\ActiveDataProvider

## Property Details

Hide inherited properties

$db public property

The DB connection object or the application component ID of the DB connection. If set it overrides $query default DB connection. Starting from version 2.0.2, this can also be a configuration array for creating the object.

public yii\db\Connection|array|string|null $db = null
$key public property

The column that is used as the key of the data models. This can be either a column name, or a callable that returns the key value of a given data model.

If this is not set, the following rules will be used to determine the keys of the data models:

- If $query is an yii\db\ActiveQuery instance, the primary keys of yii\db\ActiveQuery::$modelClass will be used.
- Otherwise, the keys of the $models array will be used.

See also getKeys().

public string|callable|null $key = null
$query public property

The query that is used to fetch data models and $totalCount if it is not explicitly set.

public yii\db\QueryInterface|null $query = null

## Method Details

Hide inherited methods

__call() public method

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.

public mixed __call ( $name, $params )
$name | string | The method name
$params | array | Method parameters
return | mixed | The method return value
throws | yii\base\UnknownMethodException | when calling unknown method

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()");
    }

__clone() public method

public void __clone ( )

Source code

                    public function __clone()
    {
        if (is_object($this->query)) {
            $this->query = clone $this->query;
        }
        parent::__clone();
    }

__construct() public method

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.

public void __construct ( $config = [] )
$config | array | 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();
    }

__get() public method

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().

public mixed __get ( $name )
$name | string | The property name
return | mixed | The property value or the value of a behavior's property
throws | yii\base\UnknownPropertyException | if the property is not defined
throws | yii\base\InvalidCallException | if the property is write-only.

Source code

                    public function __get($name)
    {
        $getter = 'get' . $name;
        if (method_exists($this, $getter)) {
            // read property, e.g. getName()
            return $this->$getter();
        }
        // behavior property
        $this->ensureBehaviors();
        foreach ($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);
    }

__isset() public method

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.

public boolean __isset ( $name )
$name | string | The property name or the event name
return | boolean | Whether the named property is set

Source code

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

__set() public method

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().

public void __set ( $name, $value )
$name | string | The property name or the event name
$value | mixed | The property value
throws | yii\base\UnknownPropertyException | if the property is not defined
throws | yii\base\InvalidCallException | if the property is read-only.

Source code

                    public function __set($name, $value)
    {
        $setter = 'set' . $name;
        if (method_exists($this, $setter)) {
            // set property
            $this->$setter($value);
            return;
        } elseif (strncmp($name, 'on ', 3) === 0) {
            // on event: attach event handler
            $this->on(trim(substr($name, 3)), $value);
            return;
        } elseif (strncmp($name, 'as ', 3) === 0) {
            // as behavior: attach behavior
            $name = trim(substr($name, 3));
            $this->attachBehavior($name, $value instanceof Behavior ? $value : Yii::createObject($value));
            return;
        }
        // behavior property
        $this->ensureBehaviors();
        foreach ($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);
    }

__unset() public method

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.

public void __unset ( $name )
$name | string | The property name
throws | yii\base\InvalidCallException | if the property is read only.

Source code

                    public function __unset($name)
    {
        $setter = 'set' . $name;
        if (method_exists($this, $setter)) {
            $this->$setter(null);
            return;
        }
        // behavior property
        $this->ensureBehaviors();
        foreach ($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);
    }

attachBehavior() public method

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

Attaches a behavior to this component.

This method will create the behavior object based on the given configuration. After that, the behavior object will be attached to this component by calling the yii\base\Behavior::attach() method.

See also detachBehavior().

public yii\base\Behavior attachBehavior ( $name, $behavior )
$name | string | The name of the behavior.

$behavior

string|array|yii\base\Behavior

The behavior configuration. This can be one of the following:

- a yii\base\Behavior object
- a string specifying the behavior class
- an object configuration array that will be passed to Yii::createObject() to create the behavior object.

return | yii\base\Behavior | The behavior object

Source code

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

attachBehaviors() public method

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

Attaches a list of behaviors to the component.

Each behavior is indexed by its name and should be a yii\base\Behavior object, a string specifying the behavior class, or an configuration array for creating the behavior.

See also attachBehavior().

public void attachBehaviors ( $behaviors )
$behaviors | array | 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);
        }
    }

behaviors() public method

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).

public array behaviors ( )
return | array | The behavior configurations.

Source code

                    public function behaviors()
    {
        return [];
    }

canGetProperty() public method

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().

public boolean canGetProperty ( $name, $checkVars = true, $checkBehaviors = true )
$name | string | The property name
$checkVars | boolean | Whether to treat member variables as properties
$checkBehaviors | boolean | Whether to treat behaviors' properties as properties of this component
return | boolean | 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;
    }

canSetProperty() public method

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().

public boolean canSetProperty ( $name, $checkVars = true, $checkBehaviors = true )
$name | string | The property name
$checkVars | boolean | Whether to treat member variables as properties
$checkBehaviors | boolean | Whether to treat behaviors' properties as properties of this component
return | boolean | 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;
    }

className() public static method
Deprecated since 2.0.14. On PHP >=5.5, use `::class` instead.

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

Returns the fully qualified name of this class.

public static string className ( )
return | string | The fully qualified name of this class.

Source code

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

detachBehavior() public method

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

Detaches a behavior from the component.

The behavior's yii\base\Behavior::detach() method will be invoked.

public yii\base\Behavior|null detachBehavior ( $name )
$name | string | The behavior's name.
return | yii\base\Behavior|null | The detached behavior. Null if the behavior does not exist.

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;
    }

detachBehaviors() public method

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

Detaches all behaviors from the component.

public void detachBehaviors ( )

Source code

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

ensureBehaviors() public method

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

Makes sure that the behaviors declared in behaviors() are attached to this component.

public void ensureBehaviors ( )

Source code

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

getBehavior() public method

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

Returns the named behavior object.

public yii\base\Behavior|null getBehavior ( $name )
$name | string | The behavior name
return | yii\base\Behavior|null | The behavior object, or null if the behavior does not exist

Source code

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

getBehaviors() public method

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

Returns all behaviors attached to this component.

public yii\base\Behavior[] getBehaviors ( )
return | yii\base\Behavior[] | List of behaviors attached to this component

Source code

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

getCount() public method

Defined in: yii\data\BaseDataProvider::getCount()

Returns the number of data models in the current page.

public integer getCount ( )
return | integer | The number of data models in the current page.

Source code

                    public function getCount()
    {
        return count($this->getModels());
    }

getKeys() public method

Defined in: yii\data\BaseDataProvider::getKeys()

Returns the key values associated with the data models.

public array getKeys ( )
return | array | The list of key values corresponding to $models. Each data model in $models is uniquely identified by the corresponding key value in this array.

Source code

                    public function getKeys()
    {
        $this->prepare();
        return $this->_keys;
    }

getModels() public method

Defined in: yii\data\BaseDataProvider::getModels()

Returns the data models in the current page.

public array getModels ( )
return | array | The list of data models in the current page.

Source code

                    public function getModels()
    {
        $this->prepare();
        return $this->_models;
    }

getPagination() public method

Defined in: yii\data\BaseDataProvider::getPagination()

Returns the pagination object used by this data provider.

Note that you should call prepare() or getModels() first to get correct values of yii\data\Pagination::$totalCount and yii\data\Pagination::$pageCount.

public yii\data\Pagination|false getPagination ( )
return | yii\data\Pagination|false | The pagination object. If this is false, it means the pagination is disabled.

Source code

                    public function getPagination()
    {
        if ($this->_pagination === null) {
            $this->setPagination([]);
        }
        return $this->_pagination;
    }

getSort() public method

Defined in: yii\data\BaseDataProvider::getSort()

Returns the sorting object used by this data provider.

public yii\data\Sort|boolean getSort ( )
return | yii\data\Sort|boolean | The sorting object. If this is false, it means the sorting is disabled.

Source code

                    public function getSort()
    {
        if ($this->_sort === null) {
            $this->setSort([]);
        }
        return $this->_sort;
    }

getTotalCount() public method

Defined in: yii\data\BaseDataProvider::getTotalCount()

Returns the total number of data models.

When $pagination is false, this returns the same value as $count. Otherwise, it will call prepareTotalCount() to get the count.

public integer getTotalCount ( )
return | integer | Total number of possible data models.

Source code

                    public function getTotalCount()
    {
        if ($this->getPagination() === false) {
            return $this->getCount();
        } elseif ($this->_totalCount === null) {
            $this->_totalCount = $this->prepareTotalCount();
        }
        return $this->_totalCount;
    }

hasEventHandlers() public method

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

Returns a value indicating whether there is any handler attached to the named event.

public boolean hasEventHandlers ( $name )
$name | string | The event name
return | boolean | Whether there is any handler attached to the event.

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);
    }

hasMethod() public method

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).

public boolean hasMethod ( $name, $checkBehaviors = true )
$name | string | The property name
$checkBehaviors | boolean | Whether to treat behaviors' methods as methods of this component
return | boolean | 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;
    }

hasProperty() public method

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()

public boolean hasProperty ( $name, $checkVars = true, $checkBehaviors = true )
$name | string | The property name
$checkVars | boolean | Whether to treat member variables as properties
$checkBehaviors | boolean | Whether to treat behaviors' properties as properties of this component
return | boolean | 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);
    }

init() public method

Initializes the DB connection component.

This method will initialize the $db property (when set) to make sure it refers to a valid DB connection.

public void init ( )
throws | yii\base\InvalidConfigException | if $db is invalid.

Source code

                    public function init()
    {
        parent::init();
        if ($this->db !== null) {
            $this->db = Instance::ensure($this->db);
        }
    }

off() public method

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().

public boolean off ( $name, $handler = null )
$name | string | Event name
$handler | callable|null | The event handler to be removed. If it is null, all handlers attached to the named event will be removed.
return | boolean | 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;
        }
        $removed = false;
        // plain event names
        if (isset($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;
            }
        }
        // wildcard event names
        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]);
                // remove empty wildcards to save future redundant regex checks:
                if (empty($this->_eventWildcards[$name])) {
                    unset($this->_eventWildcards[$name]);
                }
            }
        }
        return $removed;
    }

on() public method

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 ($event) { ... }         // anonymous function
    [$object, 'handleClick']          // $object->handleClick()
    ['Page', 'handleClick']           // Page::handleClick()
    'handleClick'                     // global function 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().

public void on ( $name, $handler, $data = null, $append = true )
$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. 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]);
        }
    }

prepare() public method

Defined in: yii\data\BaseDataProvider::prepare()

Prepares the data models and keys.

This method will prepare the data models and keys that can be retrieved via getModels() and getKeys().

This method will be implicitly called by getModels() and getKeys() if it has not been called before.

public void prepare ( $forcePrepare = false )
$forcePrepare | boolean | Whether to force data preparation even if it has been done before.

Source code

                    public function prepare($forcePrepare = false)
    {
        if ($forcePrepare || $this->_models === null) {
            $this->_models = $this->prepareModels();
        }
        if ($forcePrepare || $this->_keys === null) {
            $this->_keys = $this->prepareKeys($this->_models);
        }
    }

prepareKeys() protected method

Prepares the keys associated with the currently available data models.

protected array prepareKeys ( $models )
$models | array | The available data models
return | array | The keys

Source code

                    protected function prepareKeys($models)
    {
        $keys = [];
        if ($this->key !== null) {
            foreach ($models as $model) {
                if (is_string($this->key)) {
                    $keys[] = $model[$this->key];
                } else {
                    $keys[] = call_user_func($this->key, $model);
                }
            }
            return $keys;
        } elseif ($this->query instanceof ActiveQueryInterface) {
            /* @var $class \yii\db\ActiveRecordInterface */
            $class = $this->query->modelClass;
            $pks = $class::primaryKey();
            if (count($pks) === 1) {
                $pk = $pks[0];
                foreach ($models as $model) {
                    $keys[] = $model[$pk];
                }
            } else {
                foreach ($models as $model) {
                    $kk = [];
                    foreach ($pks as $pk) {
                        $kk[$pk] = $model[$pk];
                    }
                    $keys[] = $kk;
                }
            }
            return $keys;
        }
        return array_keys($models);
    }

prepareModels() protected method

Prepares the data models that will be made available in the current page.

protected array prepareModels ( )
return | array | The available data models

Source code

                    protected function prepareModels()
    {
        if (!$this->query instanceof QueryInterface) {
            throw new InvalidConfigException('The "query" property must be an instance of a class that implements the QueryInterface e.g. yii\db\Query or its subclasses.');
        }
        $query = clone $this->query;
        if (($pagination = $this->getPagination()) !== false) {
            $pagination->totalCount = $this->getTotalCount();
            if ($pagination->totalCount === 0) {
                return [];
            }
            $query->limit($pagination->getLimit())->offset($pagination->getOffset());
        }
        if (($sort = $this->getSort()) !== false) {
            $query->addOrderBy($sort->getOrders());
        }
        return $query->all($this->db);
    }

prepareTotalCount() protected method

Returns a value indicating the total number of data models in this data provider.

protected integer prepareTotalCount ( )
return | integer | Total number of data models in this data provider.

Source code

                    protected function prepareTotalCount()
    {
        if (!$this->query instanceof QueryInterface) {
            throw new InvalidConfigException('The "query" property must be an instance of a class that implements the QueryInterface e.g. yii\db\Query or its subclasses.');
        }
        $query = clone $this->query;
        return (int) $query->limit(-1)->offset(-1)->orderBy([])->count('*', $this->db);
    }

refresh() public method

Defined in: yii\data\BaseDataProvider::refresh()

Refreshes the data provider.

After calling this method, if getModels(), getKeys() or getTotalCount() is called again, they will re-execute the query and return the latest data available.

public void refresh ( )

Source code

                    public function refresh()
    {
        $this->_totalCount = null;
        $this->_models = null;
        $this->_keys = null;
    }

setKeys() public method

Defined in: yii\data\BaseDataProvider::setKeys()

Sets the key values associated with the data models.

public void setKeys ( $keys )
$keys | array | The list of key values corresponding to $models.

Source code

                    public function setKeys($keys)
    {
        $this->_keys = $keys;
    }

setModels() public method

Defined in: yii\data\BaseDataProvider::setModels()

Sets the data models in the current page.

public void setModels ( $models )
$models | array | The models in the current page

Source code

                    public function setModels($models)
    {
        $this->_models = $models;
    }

setPagination() public method

Defined in: yii\data\BaseDataProvider::setPagination()

Sets the pagination for this data provider.

public void setPagination ( $value )

$value

array|yii\data\Pagination|boolean

The pagination to be used by this data provider. This can be one of the following:

- a configuration array for creating the pagination object. The "class" element defaults to 'yii\data\Pagination'
- an instance of yii\data\Pagination or its subclass
- false, if pagination needs to be disabled.

throws | yii\base\InvalidArgumentException |

Source code

                    public function setPagination($value)
    {
        if (is_array($value)) {
            $config = ['class' => Pagination::className()];
            if ($this->id !== null) {
                $config['pageParam'] = $this->id . '-page';
                $config['pageSizeParam'] = $this->id . '-per-page';
            }
            $this->_pagination = Yii::createObject(array_merge($config, $value));
        } elseif ($value instanceof Pagination || $value === false) {
            $this->_pagination = $value;
        } else {
            throw new InvalidArgumentException('Only Pagination instance, configuration array or false is allowed.');
        }
    }

setSort() public method

Sets the sort definition for this data provider.

public void setSort ( $value )

$value

array|yii\data\Sort|boolean

The sort definition to be used by this data provider. This can be one of the following:

- a configuration array for creating the sort definition object. The "class" element defaults to 'yii\data\Sort'
- an instance of yii\data\Sort or its subclass
- false, if sorting needs to be disabled.

throws | yii\base\InvalidArgumentException |

Source code

                    public function setSort($value)
    {
        parent::setSort($value);
        if ($this->query instanceof ActiveQueryInterface && ($sort = $this->getSort()) !== false) {
            /* @var $modelClass Model */
            $modelClass = $this->query->modelClass;
            $model = $modelClass::instance();
            if (empty($sort->attributes)) {
                foreach ($model->attributes() as $attribute) {
                    $sort->attributes[$attribute] = [
                        'asc' => [$attribute => SORT_ASC],
                        'desc' => [$attribute => SORT_DESC],
                    ];
                }
            }
            if ($sort->modelClass === null) {
                $sort->modelClass = $modelClass;
            }
        }
    }

setTotalCount() public method

Defined in: yii\data\BaseDataProvider::setTotalCount()

Sets the total number of data models.

public void setTotalCount ( $value )
$value | integer | The total number of data models.

Source code

                    public function setTotalCount($value)
    {
        $this->_totalCount = $value;
    }

trigger() public method

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.

public void trigger ( $name, yii\base\Event $event = null )
$name | string | The event name
$event | yii\base\Event|null | The event instance. If not set, a default yii\base\Event object will be created.

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], $event);
                // stop further handling if the event is handled
                if ($event->handled) {
                    return;
                }
            }
        }
        // invoke class-level attached handlers
        Event::trigger($this, $name, $event);
    }