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<?php
/**
* @copyright Copyright © Kartik Visweswaran, Krajee.com, 2014 - 2019
* @package yii2-widgets
* @subpackage yii2-widget-depdrop
* @version 1.0.6
*/
namespace kartik\depdrop;
use Yii;
use Closure;
use yii\base\Action;
use yii\web\Response;
/**
* Dependent Dropdown action that can be used to generate the dependent option values via ajax response. A typical
* usage of this action in your controller could look like below:
*
* ```php
*
* //inside the controller
*
* public function actions()
* {
* return \yii\helpers\ArrayHelper::merge(parent::actions(), [
* 'subcategory' => [
* 'class' => \kartik\depdrop\DepDropAction::className(),
* 'outputCallback' => function ($selectedId, $params) {
* return [
* [
* 'id' => 1,
* 'name' => 'Car',
* ],
* [
* 'id' => 2,
* 'name' => 'bike',
* ],
* ];
*
* // with optgroup
* return [
* 'group1' => [
* ['id' => '<sub-cat-id-1>', 'name' => '<sub-cat-name1>'],
* ['id' => '<sub-cat_id_2>', 'name' => '<sub-cat-name2>']
* ],
* 'group2' => [
* ['id' => '<sub-cat-id-3>', 'name' => '<sub-cat-name3>'],
* ['id' => '<sub-cat-id-4>', 'name' => '<sub-cat-name4>']
* ]
* ];
* }
* ]
* ]);
* }
* ```
*
* @see http://plugins.krajee.com/dependent-dropdown
* @see http://github.com/kartik-v/dependent-dropdown
*
* @author Kartik Visweswaran <kartikv2@gmail.com>
* @since 1.0.6
*
*/
class DepDropAction extends Action
{
/**
* @var string parent parameter name for the dependent dropdown
*/
public $parentParam = 'depdrop_parents';
/**
* @var string other parameter name for the dependent dropdown
*/
public $otherParam = 'depdrop_params';
/**
* @var Closure the output callback function
*/
public $outputCallback;
/**
* @var Closure the selected callback function
*/
public $selectedCallback;
/**
* @var bool whether selected value can be empty. Defaults to `false`.
*/
public $allowEmpty = false;
/**
* @var bool whether CSRF validation is enabled for this action. Defaults to `true`.
*/
public $enableCsrfValidation = true;
/**
* @inheritdoc
*/
public function init()
{
parent::init();
$this->controller->enableCsrfValidation = $this->enableCsrfValidation;
}
/**
* @inheritdoc
*/
public function run()
{
Yii::$app->response->format = Response::FORMAT_JSON;
$request = Yii::$app->getRequest();
if (($selected = $request->post($this->parentParam)) && is_array($selected) && (!empty($selected[0]) || $this->allowEmpty)) {
$params = $request->post($this->otherParam, []);
$id = $selected[0];
return ['output' => $this->getOutput($id, $params), 'selected' => $this->getSelected($id, $params)];
}
return ['output' => '', 'selected' => ''];
}
/**
* Return select option values output
*
* @param string $id the selected value identifier
* @param array $params the parameters passed
*
* @return mixed the option values
*/
protected function getOutput($id, $params = [])
{
return $this->parseCallback('outputCallback', $id, $params);
}
/**
* Return selected value
*
* @param string $id the selected value identifier
* @param array $params the parameters passed
*
* @return string the selected value
*/
protected function getSelected($id, $params = [])
{
return $this->parseCallback('selectedCallback', $id, $params);
}
/**
* Parses the callback function name and if callable, executes it to return value
*
* @param string $funcName the function name
* @param string $id the selected value identifier
* @param array $params the parameters passed
*
* @return mixed the parsed value
*/
protected function parseCallback($funcName, $id, $params = [])
{
if (!isset($this->$funcName)) {
return '';
}
$func = $this->$funcName;
if (is_callable($func)) {
return $func($id, $params);
}
return '';
}
}