TbJsonGridColumn.php

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<?php
Yii::import('booster.widgets.TbDataColumn');

class TbJsonGridColumn extends TbDataColumn
{

        public function renderHeaderCell()
        {
                if ($this->grid->json) {
                        $header = array('id' => $this->id);
                        $content = array();
                        if ($this->grid->enableSorting && $this->sortable && $this->name !== null) {
                                $sort = $this->grid->dataProvider->getSort();
                                $label = isset($this->header) ? $this->header : $sort->resolveLabel($this->name);

                                if ($sort->resolveAttribute($this->name) !== false) {
                                        $label .= '<span class="caret"></span>';
                                }
                                $content['content'] = $sort->link($this->name, $label, array('class' => 'sort-link'));
                        } else {
                                if ($this->name !== null && $this->header === null) {
                                        if ($this->grid->dataProvider instanceof CActiveDataProvider) {
                                                $content['content'] = CHtml::encode(
                                                        $this->grid->dataProvider->model->getAttributeLabel($this->name)
                                                );
                                        } else {
                                                $content['content'] = CHtml::encode($this->name);
                                        }
                                } else {
                                        $content['content'] = trim($this->header) !== '' ? $this->header
                                                : $this->grid->blankDisplay;
                                }
                        }
                        return CMap::mergeArray($header, $content);
                }
                parent::renderHeaderCell();
        }
}