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<!DOCTYPE html>
<html>
  <head>
<meta name="description" content="Export with customisable file name" />
    <script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/dt/jszip-2.5.0/dt-1.11.4/b-2.2.2/b-html5-2.2.2/rg-1.1.4/datatables.min.css"/>
 
<script type="text/javascript" src="https://cdn.datatables.net/v/dt/jszip-2.5.0/dt-1.11.4/b-2.2.2/b-html5-2.2.2/rg-1.1.4/datatables.min.js"></script>    <meta charset=utf-8 />
    <title>DataTables - JS Bin</title>
  </head>
  <body>
    <div class="container">
      <table id="example" class="display nowrap" width="100%">
        <thead>
          <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
          </tr>
        </thead>
​
        <tfoot>
          <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
          </tr>
        </tfoot>
​
        <tbody>
          <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$3,120</td>
          </tr>
          <tr>
            <td>Garrett Winters</td>
            <td>Director</td>
            <td>Edinburgh</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Ashton Cox</td>
            <td>Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$4,800</td>
          </tr>
          <tr>
            <td>Cedric Kelly</td>
            <td>Javascript Developer</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2012/03/29</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Jenna Elliott</td>
            <td>Financial Controller</td>
            <td>Edinburgh</td>
            <td>33</td>
            <td>2008/11/28</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Brielle Williamson</td>
            <td>Integration Specialist</td>
            <td>New York</td>
            <td>61</td>
            <td>2012/12/02</td>
            <td>$4,525</td>
          </tr>
          <tr>
            <td>Herrod Chandler</td>
            <td>Sales Assistant</td>
            <td>San Francisco</td>
            <td>59</td>
            <td>2012/08/06</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Rhona Davidson</td>
            <td>Integration Specialist</td>
            <td>Edinburgh</td>
            <td>55</td>
            <td>2010/10/14</td>
            <td>$6,730</td>
          </tr>
          <tr>
            <td>Colleen Hurst</td>
            <td>Javascript Developer</td>
            <td>San Francisco</td>
            <td>39</td>
            <td>2009/09/15</td>
            <td>$5,000</td>
          </tr>
          <tr>
            <td>Sonya Frost</td>
            <td>Software Engineer</td>
            <td>Edinburgh</td>
            <td>23</td>
            <td>2008/12/13</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Jena Gaines</td>
            <td>System Architect</td>
            <td>London</td>
            <td>30</td>
            <td>2008/12/19</td>
            <td>$5,000</td>
          </tr>
          <tr>
            <td>Quinn Flynn</td>
            <td>Financial Controller</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2013/03/03</td>
            <td>$4,200</td>
          </tr>
          <tr>
            <td>Charde Marshall</td>
            <td>Regional Director</td>
            <td>San Francisco</td>
            <td>36</td>
            <td>2008/10/16</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Haley Kennedy</td>
            <td>Senior Marketing Designer</td>
            <td>London</td>
            <td>43</td>
            <td>2012/12/18</td>
            <td>$4,800</td>
          </tr>
          <tr>
            <td>Tatyana Fitzpatrick</td>
            <td>Regional Director</td>
            <td>London</td>
            <td>19</td>
            <td>2010/03/17</td>
            <td>$2,875</td>
          </tr>
          <tr>
            <td>Michael Silva</td>
            <td>Senior Marketing Designer</td>
            <td>London</td>
            <td>66</td>
            <td>2012/11/27</td>
            <td>$3,750</td>
          </tr>
          <tr>
            <td>Paul Byrd</td>
            <td>Javascript Developer</td>
            <td>New York</td>
            <td>64</td>
            <td>2010/06/09</td>
            <td>$5,000</td>
          </tr>
          <tr>
            <td>Gloria Little</td>
            <td>Systems Administrator</td>
            <td>New York</td>
            <td>59</td>
            <td>2009/04/10</td>
            <td>$3,120</td>
          </tr>
          <tr>
            <td>Bradley Greer</td>
            <td>Software Engineer</td>
            <td>London</td>
            <td>41</td>
            <td>2012/10/13</td>
            <td>$3,120</td>
          </tr>
          <tr>
            <td>Dai Rios</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>35</td>
            <td>2012/09/26</td>
            <td>$4,200</td>
          </tr>
          <tr>
            <td>Jenette Caldwell</td>
            <td>Financial Controller</td>
            <td>New York</td>
            <td>30</td>
            <td>2011/09/03</td>
            <td>$4,965</td>
          </tr>
          <tr>
            <td>Yuri Berry</td>
            <td>System Architect</td>
            <td>New York</td>
            <td>40</td>
            <td>2009/06/25</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Caesar Vance</td>
            <td>Technical Author</td>
            <td>New York</td>
            <td>21</td>
            <td>2011/12/12</td>
            <td>$4,965</td>
          </tr>
          <tr>
            <td>Doris Wilder</td>
            <td>Sales Assistant</td>
            <td>Edinburgh</td>
            <td>23</td>
            <td>2010/09/20</td>
            <td>$4,965</td>
          </tr>
          <tr>
            <td>Angelica Ramos</td>
            <td>System Architect</td>
            <td>London</td>
            <td>36</td>
            <td>2009/10/09</td>
            <td>$2,875</td>
          </tr>
          <tr>
            <td>Gavin Joyce</td>
            <td>Developer</td>
            <td>Edinburgh</td>
            <td>42</td>
            <td>2010/12/22</td>
            <td>$4,525</td>
          </tr>
          <tr>
            <td>Jennifer Chang</td>
            <td>Regional Director</td>
            <td>London</td>
            <td>28</td>
            <td>2010/11/14</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Brenden Wagner</td>
            <td>Software Engineer</td>
            <td>San Francisco</td>
            <td>18</td>
            <td>2011/06/07</td>
            <td>$3,750</td>
          </tr>
          <tr>
            <td>Ebony Grimes</td>
            <td>Software Engineer</td>
            <td>San Francisco</td>
            <td>48</td>
            <td>2010/03/11</td>
            <td>$2,875</td>
          </tr>
          <tr>
            <td>Russell Chavez</td>
            <td>Director</td>
            <td>Edinburgh</td>
            <td>20</td>
            <td>2011/08/14</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Michelle House</td>
            <td>Integration Specialist</td>
            <td>Edinburgh</td>
            <td>37</td>
            <td>2011/06/02</td>
            <td>$3,750</td>
          </tr>
          <tr>
            <td>Suki Burks</td>
            <td>Developer</td>
            <td>London</td>
            <td>53</td>
            <td>2009/10/22</td>
            <td>$2,875</td>
          </tr>
          <tr>
            <td>Prescott Bartlett</td>
            <td>Technical Author</td>
            <td>London</td>
            <td>27</td>
            <td>2011/05/07</td>
            <td>$6,730</td>
          </tr>
          <tr>
            <td>Gavin Cortez</td>
            <td>Technical Author</td>
            <td>San Francisco</td>
            <td>22</td>
            <td>2008/10/26</td>
            <td>$6,730</td>
          </tr>
          <tr>
            <td>Martena Mccray</td>
            <td>Integration Specialist</td>
            <td>Edinburgh</td>
            <td>46</td>
            <td>2011/03/09</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Unity Butler</td>
            <td>Senior Marketing Designer</td>
            <td>San Francisco</td>
            <td>47</td>
            <td>2009/12/09</td>
            <td>$3,750</td>
          </tr>
          <tr>
            <td>Howard Hatfield</td>
            <td>Financial Controller</td>
            <td>San Francisco</td>
            <td>51</td>
            <td>2008/12/16</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Hope Fuentes</td>
            <td>Financial Controller</td>
            <td>San Francisco</td>
            <td>41</td>
            <td>2010/02/12</td>
            <td>$4,200</td>
          </tr>
          <tr>
            <td>Vivian Harrell</td>
            <td>System Architect</td>
            <td>San Francisco</td>
            <td>62</td>
            <td>2009/02/14</td>
            <td>$4,965</td>
          </tr>
          <tr>
            <td>Timothy Mooney</td>
            <td>Financial Controller</td>
            <td>London</td>
            <td>37</td>
            <td>2008/12/11</td>
            <td>$4,200</td>
          </tr>
          <tr>
            <td>Jackson Bradshaw</td>
            <td>Director</td>
            <td>New York</td>
            <td>65</td>
            <td>2008/09/26</td>
            <td>$5,000</td>
          </tr>
          <tr>
            <td>Miriam Weiss</td>
            <td>Support Engineer</td>
            <td>Edinburgh</td>
            <td>64</td>
            <td>2011/02/03</td>
            <td>$4,965</td>
          </tr>
          <tr>
            <td>Bruno Nash</td>
            <td>Software Engineer</td>
            <td>London</td>
            <td>38</td>
            <td>2011/05/03</td>
            <td>$4,200</td>
          </tr>
          <tr>
            <td>Odessa Jackson</td>
            <td>Support Engineer</td>
            <td>Edinburgh</td>
            <td>37</td>
            <td>2009/08/19</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Thor Walton</td>
            <td>Developer</td>
            <td>New York</td>
            <td>61</td>
            <td>2013/08/11</td>
            <td>$3,600</td>
          </tr>
          <tr>
            <td>Finn Camacho</td>
            <td>Support Engineer</td>
            <td>San Francisco</td>
            <td>47</td>
            <td>2009/07/07</td>
            <td>$4,800</td>
          </tr>
          <tr>
            <td>Elton Baldwin</td>
            <td>Data Coordinator</td>
            <td>Edinburgh</td>
            <td>64</td>
            <td>2012/04/09</td>
            <td>$6,730</td>
          </tr>
          <tr>
            <td>Zenaida Frank</td>
            <td>Software Engineer</td>
            <td>New York</td>
            <td>63</td>
            <td>2010/01/04</td>
            <td>$4,800</td>
          </tr>
          <tr>
            <td>Zorita Serrano</td>
            <td>Software Engineer</td>
            <td>San Francisco</td>
            <td>56</td>
            <td>2012/06/01</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Jennifer Acosta</td>
            <td>Javascript Developer</td>
            <td>Edinburgh</td>
            <td>43</td>
            <td>2013/02/01</td>
            <td>$2,875</td>
          </tr>
          <tr>
            <td>Cara Stevens</td>
            <td>Sales Assistant</td>
            <td>New York</td>
            <td>46</td>
            <td>2011/12/06</td>
            <td>$4,800</td>
          </tr>
          <tr>
            <td>Hermione Butler</td>
            <td>Director</td>
            <td>London</td>
            <td>47</td>
            <td>2011/03/21</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Lael Greer</td>
            <td>Systems Administrator</td>
            <td>London</td>
            <td>21</td>
            <td>2009/02/27</td>
            <td>$3,120</td>
          </tr>
          <tr>
            <td>Jonas Alexander</td>
            <td>Developer</td>
            <td>San Francisco</td>
            <td>30</td>
            <td>2010/07/14</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Shad Decker</td>
            <td>Regional Director</td>
            <td>Edinburgh</td>
            <td>51</td>
            <td>2008/11/13</td>
            <td>$5,300</td>
          </tr>
          <tr>
            <td>Michael Bruce</td>
            <td>Javascript Developer</td>
            <td>Edinburgh</td>
            <td>29</td>
            <td>2011/06/27</td>
            <td>$4,080</td>
          </tr>
          <tr>
            <td>Donna Snider</td>
            <td>System Architect</td>
            <td>New York</td>
            <td>27</td>
            <td>2011/01/25</td>
            <td>$3,120</td>
          </tr>
        </tbody>
      </table>
​
​
    </div>
  </body>
</html>
CSSSaved
 
body {
  font: 90%/1.45em "Helvetica Neue", HelveticaNeue, Verdana, Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #fff;
}
​
JavaScriptSaved
 
​
$(document).ready(function() {
  function getHeaderNames(dt) {
    // Gets header names.
    //params:
    //  dt: Datatable API.
    //Returns:
    //  Array of column header names.
    
   
    var header = dt.columns().header().toArray();
​
    var names = [];
    header.forEach(function(th) {
     names.push($(th).html());
    });
        
    return names;
  }
  
  function buildCols(data) {
    // Builds cols XML.
    //To do: deifne widths for each column.
    //Params:
    //  data: row data.
    //Returns:
    //  String of XML formatted column widths.
    
    var cols = '<cols>';
    
    for (i=0; i<data.length; i++) {
      colNum = i + 1;
      cols += '<col min="' + colNum + '" max="' + colNum + '" width="20" customWidth="1"/>';
    }
    
    cols += '</cols>';
    
    return cols;
  }
  
  function buildRow(data, rowNum, styleNum) {
    // Builds row XML.
    //Params:
    //  data: Row data.
    //  rowNum: Excel row number.
    //  styleNum: style number or empty string for no style.
    //Returns:
    //  String of XML formatted row.
    
    var style = styleNum ? ' s="' + styleNum + '"' : '';
    
    var row = '<row r="' + rowNum + '">';
​
    for (i=0; i<data.length; i++) {
      colNum = (i + 10).toString(36).toUpperCase();  // Convert to alpha
      
      var cr = colNum + rowNum;
      
      row += '<c t="inlineStr" r="' + cr + '"' + style + '>' +
              '<is>' +
                '<t>' + data[i] + '</t>' +
              '</is>' +
            '</c>';
    }
      
    row += '</row>';
        
    return row;
  }
  
  function getTableData(groupName, title, dt) {
    // Processes Datatable row data to build sheet.
    //Params:
    //  dt: Datatable API.
    //  title: Title displayed at top of SS or empty str for no title.
    //Returns:
    //  String of XML formatted worksheet.
    
    //console.log('getTableData', groupName);
    
    var dataSrc = dt.rowGroup().dataSrc();
    
    var header = getHeaderNames(dt);
    var rowNum = 1;
    var mergeCells = '';
    var ws = '';
    
    ws += buildCols(header);
    ws += '<sheetData>';
    
    if (title.length > 0) {
      ws += buildRow([title], rowNum, 51);
      rowNum++;
      
      mergeCol = ((header.length - 1) + 10).toString(36).toUpperCase();
      
      mergeCells = '<mergeCells count="1">'+
        '<mergeCell ref="A1:' + mergeCol + '1"/>' +
                   '</mergeCells>';
    }
                      
    ws += buildRow(header, rowNum, 2);
    rowNum++;
    
    // Loop through each row to append to sheet.    
      // Update the rows().every() loop in getTableData with this function
      table.rows(
        function ( idx, data, node ) {
          return data[ dataSrc ] === groupName ?
            true : false;
        }
      ).every( function ( rowIdx, tableLoop, rowLoop ) {
        var data = this.data();
        // If data is object based then it needs to be converted 
        // to an array before sending to buildRow()
        ws += buildRow(data, rowNum, '');
      
        rowNum++;
      } );
​
    
    ws += '</sheetData>' + mergeCells;
        
    return ws;
​
  }
  
  function setSheetName(xlsx, name) {
    // Changes tab title for sheet.
    //Params:
    //  xlsx: xlxs worksheet object.
    //  name: name for sheet.
    
    if (name.length > 0) {
      var source = xlsx.xl['workbook.xml'].getElementsByTagName('sheet')[0];
      source.setAttribute('name', name);
    }
  }
  
  function addSheet(xlsx, groupName, title, name, sheetId, dt) {
    //Clones sheet from Sheet1 to build new sheet.
    //Params:
    //  xlsx: xlsx object.
    //  table: table ID.
    //  title: Title for top row or blank if no title.
    //  name: Name of new sheet.
    //  sheetId: string containing sheetId for new sheet.
    //Returns:
    //  Updated sheet object.
    
    //Add sheet2 to [Content_Types].xml => <Types>
    //============================================
    var source = xlsx['[Content_Types].xml'].getElementsByTagName('Override')[1];
    var clone = source.cloneNode(true);
    clone.setAttribute('PartName','/xl/worksheets/sheet' + sheetId + '.xml');
    xlsx['[Content_Types].xml'].getElementsByTagName('Types')[0].appendChild(clone);
    
    //Add sheet relationship to xl/_rels/workbook.xml.rels => Relationships
    //=====================================================================
    var source = xlsx.xl._rels['workbook.xml.rels'].getElementsByTagName('Relationship')[0];
    var clone = source.cloneNode(true);
    clone.setAttribute('Id','rId'+sheetId+1);
    clone.setAttribute('Target','worksheets/sheet' + sheetId + '.xml');
    xlsx.xl._rels['workbook.xml.rels'].getElementsByTagName('Relationships')[0].appendChild(clone);
    
    //Add second sheet to xl/workbook.xml => <workbook><sheets>
    //=========================================================
    var source = xlsx.xl['workbook.xml'].getElementsByTagName('sheet')[0];
    var clone = source.cloneNode(true);
    clone.setAttribute('name', name);
    clone.setAttribute('sheetId', sheetId);
    clone.setAttribute('r:id','rId'+sheetId+1);
    xlsx.xl['workbook.xml'].getElementsByTagName('sheets')[0].appendChild(clone);
    
    //Add sheet2.xml to xl/worksheets
    //===============================
    var newSheet = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'+
      '<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" mc:Ignorable="x14ac">'+
      getTableData(groupName, title, dt) +
      
      '</worksheet>';
​
    xlsx.xl.worksheets['sheet' + sheetId + '.xml'] = $.parseXML(newSheet);
    
  }
  
  
  function updateSheet1(xlsx, groupName, title, dt) {
    
    //console.log('updateSheet', groupName);
​
    // Get number of columns to remove last hidden index column.
    var numColumns = dt.columns().header().count();
    var newSheet = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'+
      '<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" mc:Ignorable="x14ac">'+
      getTableData(groupName, title, dt) +
      
      '</worksheet>';
​
    // Get sheet.
    var sheet = xlsx.xl.worksheets['sheet1.xml'] = $.parseXML(newSheet);
​
    setSheetName( xlsx, groupName );
    
  }
​
​
  var table = $('#example').DataTable({
    rowGroup: {
      dataSrc: 2
    },
    order: [[2, 'asc']],
    dom: 'Bfrtip',
    buttons: [{
      extend: 'excelHtml5',
      customize: function( xlsx, button, dt ) {
        
        var dataSrc = dt.rowGroup().dataSrc();
​
        // Get unique values from rowGroup.dataSrc column
        var groupNames = [... new Set( dt.column( dataSrc ).data().toArray() )];
        //console.log('Groups:', groupNames);
        
        var sheetId = 1;
​
        // Get row data belonging to each group
        groupNames.forEach(function (groupName, index) {
​
          if (sheetId === 1) {
            updateSheet1( xlsx, groupName, groupName, dt );
          } else {
            addSheet( xlsx, groupName, groupName, groupName, sheetId, dt )
          }
          sheetId++;
​
        });        
        
        
      },
    }]
  });
​
​
​
});
1 error 5 warnings
Line 160: 'source' is already defined.
Line 161: 'clone' is already defined.
Line 168: 'source' is already defined.
Line 169: 'clone' is already defined.
Line 221: 'spread/rest operator' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
Line 232: Missing semicolon.
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