如何在tcpdf中的每个页面上放置表格的列标题？

Question

用于打印pdf的代码如下:

class MYPDF extends TCPDF {

    // Load table data from file
    public function LoadData($file) {
        // Read file lines
        $lines = file($file);
        $data = array();
        foreach($lines as $line) {
            $data[] = explode(';', chop($line));
        }
        return $data;
    }

    // Colored table
    public function ColoredTable($header,$data) {
        // Colors, line width and bold font
        $this->SetFillColor(233, 136, 64);
        $this->SetTextColor(255);
        $this->SetDrawColor(128, 0, 0);
        $this->SetLineWidth(0.3);
        $this->SetFont('', 'B');
        // Header
        $w = array(10, 40, 20, 20, 20, 20, 20);
        $num_headers = count($header);
        for($i = 0; $i < $num_headers; ++$i) {
            $this->Cell($w[$i], 7, $header[$i], 1, 0, 'C', 1);
        }
        $this->Ln();
        // Color and font restoration
        $this->SetFillColor(224, 235, 255);
        $this->SetTextColor(0);
        $this->SetFont('');
        // Data
        $fill = 0;
        foreach($data as $row) {
            $this->Cell($w[0], 6, $row[0], 'LR', 0, 'C', $fill);
            $this->Cell($w[1], 6, $row[1], 'LR', 0, 'L', $fill);
            $this->Cell($w[2], 6, $row[2], 'LR', 0, 'C', $fill);
            $this->Cell($w[3], 6, $row[3], 'LR', 0, 'C', $fill);
            $this->Cell($w[4], 6, $row[4], 'LR', 0, 'C', $fill);
            $this->Cell($w[5], 6, $row[5], 'LR', 0, 'C', $fill);
            $this->Cell($w[6], 6, $row[6], 'LR', 0, 'C', $fill);
            $this->Ln();
            $fill=!$fill;
        }
        $this->Cell(array_sum($w), 0, '', 'T');
    }
}

// create new PDF document
$pdf = new MYPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

// set document information
$pdf->SetCreator(PDF_CREATOR);
$pdf->SetAuthor('Nicola Asuni');
$pdf->SetTitle('TCPDF Example 011');
$pdf->SetSubject('TCPDF Tutorial');
$pdf->SetKeywords('TCPDF, PDF, example, test, guide');

// set default header data
$pdf->SetHeaderData(PDF_GYANKUTIR_LOGO, PDF_HEADER_LOGO_WIDTH, 'GyanKutir', 
'Jhunjhunu International Wisdom City
Near Khemi Shakti Temple
Jhunjhunu (Rajasthan)-333001');

// set header and footer fonts
$pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
$pdf->setFooterFont(Array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));

// set default monospaced font
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);

//set margins
$pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
$pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
$pdf->SetFooterMargin(PDF_MARGIN_FOOTER);

//set auto page breaks
$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);

//set image scale factor
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);

//set some language-dependent strings
$pdf->setLanguageArray($l);

// ---------------------------------------------------------

// set font
$pdf->SetFont('helvetica', '', 6);

// add a page
$pdf->AddPage();

//Column titles
$header = array('Rank', 'Student', 'Time Used', 'Correct Answers', 'Wrong Answers','Questions Skipped','Final Score');


$final_data = $smarty->fetch($file_to_show);

$file = fopen("text.txt","w+");

    file_put_contents($file,"");
    fwrite($file,$final_data);
    fclose($file);

ob_start();
        ob_flush();
//Data loading
$data = $pdf->LoadData('text.txt');

// print colored table
$pdf->ColoredTable($header, $data);

// ---------------------------------------------------------
 ob_flush();
//Close and output PDF document
$pdf->Output('example_011.pdf', 'I');

//============================================================+
// END OF FILE                                                
//============================================================+

我想将标题添加到每页的表格列中.屏幕截图附有此问题.在第一个屏幕截图中,标题显示但在第二个屏幕截图中没有显示.如何在后续页面上显示这些列标题？请帮我解决这个问题.谢谢你提前.这张图片是pdf表格的第一页.

Answer 1

另一种方法是在html中简单地使用THEAD标记.

<table>
<thead>
    <tr><th>Heading</th></tr>
</thead>
<tbody>
    <tr><td>Many rows...</td></tr>
    <tr><td>of data</td></tr>
</tbody>
</table>

似乎TCPDF在每个页面上重复标题.

Answer 2

我想到了两种方法.

方法1:创建自己的自定义标头函数(如在TCPDF示例3中),自动将标题单元格添加到每个页面.在这种情况下,您可以将标题单元格放置代码移动到Header类中的方法中,并将标题绘制到页面上的固定位置.由于在Header添加新页面时会自动调用该方法,因此只要创建页面,就会添加表头.这肯定比方法2更快,更少,但它可能有点棘手.

方法2:使用TCPDF事务来检测行何时打破页面,然后回滚.那你就AddPage自己吧; 再次绘制标题; 并继续显示.您可以通过在创建行之前获取页数并将其与之后的页数进行比较来完成此操作.您可以通过以下方式执行此操作的示例:

    //Separated Header Drawing into it's own function for reuse.
    public function DrawHeader($header, $w) {
        // Colors, line width and bold font
        // Header
        $this->SetFillColor(233, 136, 64);
        $this->SetTextColor(255);
        $this->SetDrawColor(128, 0, 0);
        $this->SetLineWidth(0.3);
        $this->SetFont('', 'B');        
        $num_headers = count($header);
        for($i = 0; $i < $num_headers; ++$i) {
            $this->Cell($w[$i], 7, $header[$i], 1, 0, 'C', 1);
        }
        $this->Ln();
        // Color and font restoration
        $this->SetFillColor(224, 235, 255);
        $this->SetTextColor(0);
        $this->SetFont('');
    }

    // Colored table
    public function ColoredTable($header,$data) {
        $w = array(10, 40, 20, 20, 20, 20, 20);
        $this->DrawHeader($header, $w);

        // Data
        $fill = 0;
        foreach($data as $row) {
            //Get current number of pages.
            $num_pages = $this->getNumPages();
            $this->startTransaction();
            $this->Cell($w[0], 6, $row[0], 'LR', 0, 'C', $fill);
            $this->Cell($w[1], 6, $row[1], 'LR', 0, 'L', $fill);
            $this->Cell($w[2], 6, $row[2], 'LR', 0, 'C', $fill);
            $this->Cell($w[3], 6, $row[3], 'LR', 0, 'C', $fill);
            $this->Cell($w[4], 6, $row[4], 'LR', 0, 'C', $fill);
            $this->Cell($w[5], 6, $row[5], 'LR', 0, 'C', $fill);
            $this->Cell($w[6], 6, $row[6], 'LR', 0, 'C', $fill);
            $this->Ln();
            //If old number of pages is less than the new number of pages,
            //we hit an automatic page break, and need to rollback.
            if($num_pages < $this->getNumPages())
            {
                //Undo adding the row.
                $this->rollbackTransaction(true);
                //Adds a bottom line onto the current page. 
                //Note: May cause page break itself.
                $this->Cell(array_sum($w), 0, '', 'T');
                //Add a new page.
                $this->AddPage();
                //Draw the header.
                $this->DrawHeader($header, $w);
                //Re-do the row.
                $this->Cell($w[0], 6, $row[0], 'LR', 0, 'C', $fill);
                $this->Cell($w[1], 6, $row[1], 'LR', 0, 'L', $fill);
                $this->Cell($w[2], 6, $row[2], 'LR', 0, 'C', $fill);
                $this->Cell($w[3], 6, $row[3], 'LR', 0, 'C', $fill);
                $this->Cell($w[4], 6, $row[4], 'LR', 0, 'C', $fill);
                $this->Cell($w[5], 6, $row[5], 'LR', 0, 'C', $fill);
                $this->Cell($w[6], 6, $row[6], 'LR', 0, 'C', $fill);
                $this->Ln();
            }
            else
            {
                //Otherwise we are fine with this row, discard undo history.
                $this->commitTransaction();
            }
            $fill=!$fill;
        }
        $this->Cell(array_sum($w), 0, '', 'T');
    }