数据表-尝试导出为PDF时未定义的格式错误的表格行单元格未定义

分类：编程问答

如何解决数据表-尝试导出为PDF时未定义的格式错误的表格行单元格未定义

我有下表

<table id="dtBasicExample" class="table table-bordered" style="border : none;">
    <thead class="text-info" style="border : none;">
        <tr>
            <th colspan="16" style="border : none;"></th>
        </tr>
        <tr>
            <th colspan="2" class="text-right" style="border : none;">Date</th>
            <th colspan="14" style="border : none;">: <%=dstart%> - <%=dend%></th>
        </tr>
        <tr>
            <th colspan="2" class="text-right" style="border:none;">Personel</th>
            <th colspan="14" style="border : none;">: <%=pers%></th>
        </tr>
        <tr>
            <th colspan="2" class="text-right" style="border:none;">Grade</th>
            <th colspan="14" style="border : none;">: <%=grade%></th>
        </tr>
        <tr>
            <th colspan="2" class="text-right" style="border:none;">Date Generated</th>
            <th colspan="14" style="border : none;">: <%=nowdate %></th>
        </tr>
        <tr>
            <th colspan="16" style="border-left : none; border-right: none;"/>
        </tr>
        <tr class="text-center">
            <th rowspan="3">Date</th>
            <th colspan="14">Number of Students</th>
            <th rowspan="3">Grand Total</th>
        </tr>
        <tr class="text-center">
            <th colspan="7">Class A</th>
            <th colspan="7">Class B</th>
        </tr>
        <tr class="text-center">
            <th style="width:6.2%;">Eng</th>
            <th style="width:6.2%;">BM</th>
            <th style="width:6.2%;">Man</th>
            <th style="width:6.2%;">SC</th>
            <th style="width:6.2%;">PHY</th>
            <th style="width:6.2%;">CHE</th>
            <th style="width:6.2%;">Sum</th>
            <th style="width:6.2%;">Eng</th>
            <th style="width:6.2%;">BM</th>
            <th style="width:6.2%;">Man</th>
            <th style="width:6.2%;">SC</th>
            <th style="width:6.2%;">PHY</th>
            <th style="width:6.2%;">CHE</th>
            <th style="width:6.2%;">Sum</th>
        </tr>
    </thead>
...

下面是我用于PDF导出的js。

{
    action: function (e,dt,button,config) {
        showNotification('top','right','PDF exported sucessfully!');
        $.fn.dataTable.ext.buttons.pdfHtml5.action.call(this,e,config);
    },extend: 'pdf',className: 'btn-info btnspaces',text: 'Export to PDF',filename: 'Students',orientation: 'landscape',pageSize: 'LEGAL',customize: function (pdf) {
        var firstHeaderRow = [];
        var secondHeaderRow = [];
        //11
        $('#dtBasicExample').find("thead>tr:nth-child(7)>th").each(
            function (index,element) {
            var colSpan = element.getAttribute("colspan");
            var rowSpan = element.getAttribute("rowspan");
            firstHeaderRow.push({
                text: element.innerHTML,style: "tableHeader",colSpan: colSpan,rowSpan: rowSpan
            });
            for (var i = 0; i < colSpan - 1; i++) {
                firstHeaderRow.push({});
            }
        });
        //10
        $('#dtBasicExample').find("thead>tr:nth-child(8)>th").each(
            function (index,element) {
            var colSpan = element.getAttribute("colspan");
            var rowSpan = element.getAttribute("rowspan");
            secondHeaderRow.push({
                text: element.innerHTML,rowSpan: rowSpan
            });
            for (var i = 0; i < colSpan - 1; i++) {
                secondHeaderRow.push({});
            }
        });

        pdf.content[1].table.headerRows = 3;

        var objLayout = {};
        objLayout['hLineWidth'] = function (i) {
            return .5;
        };
        objLayout['vLineWidth'] = function (i) {
            return .5;
        };
        objLayout['hLineColor'] = function (i) {
            return 'black';
        };
        objLayout['vLineColor'] = function (i) {
            return 'black';
        };
        objLayout['paddingTop'] = function (i) {
            return 5;
        };
        objLayout['paddingBottom'] = function (i) {
            return 5;
        };
        objLayout['paddingLeft'] = function (i) {
            return 9;
        };
        objLayout['paddingRight'] = function (i) {
            return 9;
        };
        pdf.content[1].table.body.unshift(secondHeaderRow);
        pdf.content[1].table.body.unshift(firstHeaderRow);
        pdf.content[1].layout = objLayout;
    }

将它导出到excel时没有问题，但是当我尝试将其导出到PDF时，会出现错误

未捕获的格式错误的表格行未定义单元格

我试图删除colspan并手动将<td></td>添加到表中最多16个cols，它可以正常工作，但是日期和总计在最后一列中，而不是跨越3列。 / p>

解决方法

要使用colSpan和rowSpan导出pdf标头，应为空白覆盖的单元格填充空白单元格。以下代码段将填充空白行，这些行基于头行（

）的colSpan和rowSpan。

由于Download in Sandboxed Iframes (removed)，代码段中的按钮不起作用，您可以将以下代码复制到html文件中，然后使用浏览器打开文件以查看效果。 

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/dt/jszip-2.5.0/dt-1.10.21/b-1.6.2/b-flash-1.6.2/b-html5-1.6.2/b-print-1.6.2/datatables.min.css" />

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/pdfmake.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.36/vfs_fonts.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/v/dt/jszip-2.5.0/dt-1.10.21/b-1.6.2/b-flash-1.6.2/b-html5-1.6.2/b-print-1.6.2/datatables.min.js"></script>

<script type="text/javascript">
  $(document).ready(function() {
    $('#dataTable').DataTable({
      dom: 'Bfrtip',buttons: [{
        extend: 'pdf',download: 'download',text: 'Export to PDF',filename: 'Students',orientation: 'landscape',pageSize: 'LEGAL',customize: function(pdfDocument) {
          let headerRows = [];
          let noOfColumn = 16;
          let rowSpansOfColumns = [];
          for (let i = 0; i < noOfColumn; i++) {
            rowSpansOfColumns.push([]);
          }
          let noOfExtraHeaderRow = 3;
          pdfDocument.content[1].table.headerRows = noOfExtraHeaderRow + 1;
          for (let i = 1; i <= noOfExtraHeaderRow; i++) {
            let headerRow = [];
            let colIdx = 0;
            while (colIdx < rowSpansOfColumns.length && rowSpansOfColumns[colIdx].includes(i)) {
              headerRow.push({});
              colIdx++
            }

            $('#dataTable').find("thead>tr:nth-child(" + i + ")>th").each(
              function(index,element) {
                let colSpan = parseInt(element.getAttribute("colSpan"));
                let rowSpan = parseInt(element.getAttribute("rowSpan"));
                if (rowSpan > 1) {
                  for (let col = colIdx; col < colIdx + colSpan; col++) {
                    for (let row = i + 1; row < i + rowSpan; row++) {
                      rowSpansOfColumns[col].push(row);
                    }
                  }
                }
                headerRow.push({
                  text: element.innerHTML,style: "tableHeader",colSpan: colSpan,rowSpan: rowSpan
                });
                colIdx++
                for (let j = 0; j < colSpan - 1; j++) {
                  headerRow.push({});
                  colIdx++
                }
                while (colIdx < rowSpansOfColumns.length && rowSpansOfColumns[colIdx].includes(i)) {
                  headerRow.push({});
                  colIdx++
                }
              });

            headerRows.push(headerRow);
          }
          for (let i = 0; i < headerRows.length; i++) {
            pdfDocument.content[1].table.body.unshift(headerRows[headerRows.length - 1 - i]);
          }
        }

      }]
    });
  });
</script>

<table id="dataTable" cellspacing="0" width="auto">
  <thead>
    <tr>
      <th colspan="16" style="border-left : none; border-right: none;"></th>
    </tr>
    <tr class="text-center">
      <th rowspan="3">Date</th>
      <th colspan="14">Number of Students</th>
      <th rowspan="3">Grand Total</th>
    </tr>
    <tr class="text-center">
      <th colspan="7">Class A</th>
      <th colspan="7">Class B</th>
    </tr>

    <tr class="text-center">
      <th style="width:6.2%;">Eng</th>
      <th style="width:6.2%;">BM</th>
      <th style="width:6.2%;">Man</th>
      <th style="width:6.2%;">SC</th>
      <th style="width:6.2%;">PHY</th>
      <th style="width:6.2%;">CHE</th>
      <th style="width:6.2%;">Sum</th>
      <th style="width:6.2%;">Eng</th>
      <th style="width:6.2%;">BM</th>
      <th style="width:6.2%;">Man</th>
      <th style="width:6.2%;">SC</th>
      <th style="width:6.2%;">PHY</th>
      <th style="width:6.2%;">CHE</th>
      <th style="width:6.2%;">Sum</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>2020/10/11</td>
      <td>50</td>
      <td>60</td>
      <td>70</td>
      <td>80</td>
      <td>90</td>
      <td>85</td>
      <td>25</td>
      <td>50</td>
      <td>60</td>
      <td>70</td>
      <td>80</td>
      <td>90</td>
      <td>85</td>
      <td>25</td>
      <td>100</td>
    </tr>
    <tr>
      <td>2020/11/11</td>
      <td>53</td>
      <td>63</td>
      <td>73</td>
      <td>83</td>
      <td>93</td>
      <td>83</td>
      <td>23</td>
      <td>53</td>
      <td>63</td>
      <td>73</td>
      <td>83</td>
      <td>93</td>
      <td>83</td>
      <td>26</td>
      <td>100</td>
    </tr>
  </tbody>
</table>

已导出报告的图像

pdf_withRowSpanHeader

参考文献：
pdfmake documentation
pdfmake playground

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