TbJsonCheckBoxColumn.php

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<?php
class TbJsonCheckBoxColumn extends CCheckBoxColumn
{
        public function renderHeaderCell()
        {
                if ($this->grid->json) {
                        $this->headerHtmlOptions['id'] = $this->id;
                        if ($this->grid->json) {
                                return CMap::mergeArray(
                                        $this->headerHtmlOptions,
                                        array('content' => $this->renderHeaderCellContent())
                                );
                        }
                }
                parent::renderHeaderCell();
        }

        protected function renderHeaderCellContent()
        {
                if ($this->grid->json) {
                        if (trim($this->headerTemplate) === '') {
                                return $this->grid->blankDisplay;
                        }

                        if ($this->selectableRows === null && $this->grid->selectableRows > 1) {
                                $item = CHtml::checkBox($this->id . '_all', false, array('class' => 'select-on-check-all'));
                        } else if ($this->selectableRows > 1) {
                                $item = CHtml::checkBox($this->id . '_all', false);
                        } else {
                                ob_start();
                                parent::renderHeaderCellContent();
                                $item = ob_get_clean();
                        }

                        return strtr(
                                $this->headerTemplate,
                                array(
                                        '{item}' => $item,
                                )
                        );
                }
                parent::renderHeaderCellContent();
        }

        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;
        }
}