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HTMLSaved
 
<!DOCTYPE html>
<html>
  <head>
    <script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
​
    <link href="https://nightly.datatables.net/css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
    <script src="https://nightly.datatables.net/js/jquery.dataTables.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>Sunday</th>
            <th>Monday</th>
            <th>Tuesday</th>
            <th>Wednesday</th>
            <th>Thursday</th>
            <th>Friday</th>
            <th>Satuday</th>
          </tr>
        </thead>
      </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 () {
  
  events = {
    10: [
      {
        'event_name': 'My Event',
        'start_date': 10,
        'start_time': '10:00'
      }
    ],
    18: [
      {
        'event_name': 'Brew coffee',
        'start_date': 18,
        'start_time': '6:00'
      },
      {
        'event_name': 'Eat lunch',
        'start_date': 18,
        'start_time': '12:00'
      }
    ]
  };
  
  months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
​
  var table = $('#example').DataTable({
    pageLenght: 6,
    columnDefs: [
      {
        targets: '_all',
        defaultContent: '',
        render: function (data, type, row) {
          if (type === 'display') {
            if (typeof data === 'object') {
              return data.start_date + ' ' + data.event_name;
            }
            return data;
          }
          return data;
        }
      }
    ],
    
    rowCallback: function (row, data) {
      
      var updated = false;
      
      for (i=0; i<data.length; i++) {
        var day = data[i];
        if (events.hasOwnProperty( day )) {
          dailyEvents = events[day];
                    
          for (e=0; e<dailyEvents.length; e++) {
            data[i] += '<br>' + dailyEvents[e].event_name;
          }
          updated = true;
         
        }
      }
      
      if ( updated ) {
        var api = this.api();
        api.row( row ).data( data ).draw(false);
      }
      
    }
  });
  
​
  // check how many days in a month code from https://dzone.com/articles/determining-number-days-month
  function daysInMonth(iMonth, iYear) {
    return 32 - new Date(iYear, iMonth, 32).getDate();
  }
​
  function showCalendar(month, year) {
​
    let firstDay = (new Date(year, month)).getDay();
​
    // creating all cells
    let date = 1;
    for (let i = 0; i < 6; i++) {
      // creates a table row
      let row = [];
​
      //creating individual cells, filing them up with data.
      for (let j = 0; j < 7; j++) {
        if (i === 0 && j < firstDay) {
          row.push('');
        }
        else if (date > daysInMonth(month, year)) {
          break;
        }
​
        else {
          if (date === 1) {
            row.push( months[month - 1] + " " + date );
          } else {
            row.push( date );
          }
          date++;
        }
​
​
      }
​
​
      table.row.add( row ); // appending each row into calendar body.
    }
​
    table.draw();
​
  }
​
  showCalendar(9, 2021);
​
} );
​
5 warnings
Line 78: 'let' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
Line 81: 'let' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
Line 82: 'let' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
Line 84: 'let' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
Line 87: 'let' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz).
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