TbSelect2.php

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<?php
class TbSelect2 extends CInputWidget {
        
        public $form;
        public $data = array();

        public $events = array();

        public $asDropDownList = true;

        public $val;

        public $options;

    public $readonly = false;

    public $disabled = false;

        public function init()
        {
                $this->normalizeData();

                $this->normalizeOptions();

                $this->addEmptyItemIfPlaceholderDefined();

                $this->setDefaultWidthIfEmpty();

        // disabled & readonly
        if (!empty($this->htmlOptions['readonly'])) {
            $this->readonly = true;
        }
        if (!empty($this->htmlOptions['disabled'])) {
            $this->disabled = true;
        }
        }

        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);
        }

        public function registerClientScript($id) {
                
        Booster::getBooster()->registerPackage('select2');

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

                if(! empty($this->val)) {
                        if(is_array($this->val)) {
                                $data = CJSON::encode($this->val);
                        } else {
                                $data = $this->val;
                        }

                        $defValue = ".select2('val', $data)";
                }
                else
                        $defValue = '';

        if ($this->readonly) {
            $defValue .= ".select2('readonly', true)";
        }
        elseif ($this->disabled) {
            $defValue .= ".select2('enable', false)";
        }

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

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

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

        private function normalizeData()
        {
                if (!$this->data)
                        $this->data = array();
        }

        private function addEmptyItemIfPlaceholderDefined()
        {
                if (!empty($this->htmlOptions['placeholder']))
                        $this->options['placeholder'] = $this->htmlOptions['placeholder'];

                if (!empty($this->options['placeholder']) && empty($this->htmlOptions['multiple']))
                        $this->prependDataWithEmptyItem();
        }

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

        private function prependDataWithEmptyItem()
        {
                $this->data = array('' => '') + $this->data;
        }
}