TbJsonButtonColumn.php

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

class TbJsonButtonColumn extends TbButtonColumn
{
        public function renderHeaderCell()
        {
                if ($this->grid->json) {
                        ob_start();
                        $this->renderHeaderCellContent();
                        $content = ob_get_contents();
                        ob_end_clean();

                        return array('id' => $this->id, 'content' => $content);
                }
                parent::renderHeaderCell();
        }

        public function renderDataCell($row)
        {
                if ($this->grid->json) {
            $data = $this->grid->dataProvider->data[$row];
            $options = $this->htmlOptions;
            if ($this->cssClassExpression !== null) {
                $class = $this->evaluateExpression($this->cssClassExpression, array('row' => $row, 'data' => $data));
                if (!empty($class)) {
                    if (isset($options['class'])) {
                        $options['class'] .= ' ' . $class;
                    } else {
                        $options['class'] = $class;
                    }
                }
            }

            return array(
                'attrs' => CHtml::renderAttributes($options),
                'content' => $this->renderDataCellContent($row, $data),
            );
                }

                parent::renderDataCell($row);
        }

    protected function renderDataCellContent($row, $data)
    {
        ob_start();
        parent::renderDataCellContent($row, $data);
        $html = ob_get_contents();
        ob_end_clean();

        if ($this->grid->json) {
            return $html;
        }

        echo $html;
    }

        protected function initDefaultButtons()
        {
                parent::initDefaultButtons();
                $this->buttons['delete']['click'] = strtr(
                        $this->buttons['delete']['click'],
                        array('yiiGridView' => 'yiiJsonGridView')
                );
        }
}