kartik\grid\GridView::renderTableHeader PHP Méthode

    public function renderTableHeader()
    {
        $cells = [];
        foreach ($this->columns as $index => $column) {
            /* @var DataColumn $column */
            if ($this->resizableColumns && $this->persistResize) {
                $column->headerOptions['data-resizable-column-id'] = "kv-col-{$index}";
            }
            $cells[] = $column->renderHeaderCell();
        }
        $content = Html::tag('tr', implode('', $cells), $this->headerRowOptions);
        if ($this->filterPosition == self::FILTER_POS_HEADER) {
            $content = $this->renderFilters() . $content;
        } elseif ($this->filterPosition == self::FILTER_POS_BODY) {
            $content .= $this->renderFilters();
        }
        return "<thead>\n" . $this->generateRows($this->beforeHeader) . "\n" . $content . "\n" . $this->generateRows($this->afterHeader) . "\n" . "</thead>";
    }