/admincrud/extensions/bootstrap/widgets/TbSelect2.php

<?php
/*##  TbSelect2 class file.
 *
 * @author Antonio Ramirez <antonio@clevertech.biz>
 * @copyright Copyright &copy; Clevertech 2012-
 * @license [New BSD License](http://www.opensource.org/licenses/bsd-license.php) 
 * @package bootstrap.widgets.input
 */
class TbSelect2 extends CInputWidget
{
	/**
	 * @var TbActiveForm when created via TbActiveForm.
	 * This attribute is set to the form that renders the widget
	 * @see TbActionForm->inputRow
	 */
	public $form;
	/**
	 * @var array @param data for generating the list options (value=>display)
	 */
	public $data = array();

	/**
	 * @var string[] the JavaScript event handlers.
	 */
	public $events = array();

	/**
	 * @var bool whether to display a dropdown select box or use it for tagging
	 */
	public $asDropDownList = true;

	/**
	 * @var string the default value.
	 */
	public $val;

	/**
	 * @var
	 */
	public $options;

	/**
	 *### .init()
	 *
	 * Initializes the widget.
	 */
	public function init()
	{
		if (empty($this->data) && $this->asDropDownList === true) {
			throw new CException(Yii::t('zii', '"data" attribute cannot be blank'));
		}

		$this->setDefaultWidthIfEmpty();
	}

	/**
	 *### .run()
	 *
	 * Runs the widget.
	 */
	public function run()
	{
		list($name, $id) = $this->resolveNameID();

		if ($this->hasModel()) {
			if ($this->form) {
				echo $this->asDropDownList
					?
					$this->form->dropDownList($this->model, $this->attribute, $this->data, $this->htmlOptions)
					:
					$this->form->hiddenField($this->model, $this->attribute, $this->htmlOptions);
			} else {
				echo $this->asDropDownList
					?
					CHtml::activeDropDownList($this->model, $this->attribute, $this->data, $this->htmlOptions)
					:
					CHtml::activeHiddenField($this->model, $this->attribute, $this->htmlOptions);
			}

		} else {
			echo $this->asDropDownList
				?
				CHtml::dropDownList($name, $this->value, $this->data, $this->htmlOptions)
				:
				CHtml::hiddenField($name, $this->value, $this->htmlOptions);
		}

		$this->registerClientScript($id);
	}

	/**
	 *### .registerClientScript()
	 *
	 * Registers required client script for bootstrap select2. It is not used through bootstrap->registerPlugin
	 * in order to attach events if any
	 */
	public function registerClientScript($id)
	{
		Yii::app()->bootstrap->registerAssetCss('select2.css');
		Yii::app()->bootstrap->registerAssetJs('select2.js');

		$options = !empty($this->options) ? CJavaScript::encode($this->options) : '';

		$defValue = !empty($this->val) ? ".select2('val', '$this->val')" : '';

		ob_start();
		echo "jQuery('#{$id}').select2({$options})$defValue";
		foreach ($this->events as $event => $handler) {
			echo ".on('{$event}', " . CJavaScript::encode($handler) . ")";
		}

		Yii::app()->getClientScript()->registerScript(__CLASS__ . '#' . $this->getId(), ob_get_clean() . ';');
	}

	private function setDefaultWidthIfEmpty()
	{
		if (empty($this->options)) {
			$this->options = array();
		}

		if (empty($this->options['width'])) {
			$this->options['width'] = 'resolve';
		}
	}
}