Datatables-Range filtering

HTML

<link rel="stylesheet" href="https://cdn.datatables.net/1.10.18/css/jquery.dataTables.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://cdn.datatables.net/1.10.18/js/jquery.dataTables.min.js"></script>
<table border="0" cellspacing="5" cellpadding="5">
  <tbody>
    <tr>
      <td>Minimum age:</td>
      <td><input type="text" id="min" name="min"></td>
    </tr>
    <tr>
      <td>Maximum age:</td>
      <td><input type="text" id="max" name="max"></td>
    </tr>
  </tbody>
</table>
<table id="example" class="display" style="width:100%">
  <thead>
    <tr>
      <th class="text">Name</th>
      <th class="text">Position</th>
      <th class="text">Office</th>
      <th>Age</th>
      <th class="text">Start date</th>
      <th class="text">Salary</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Tiger Nixon</td>
      <td>System Architect</td>
      <td>Edinburgh</td>
      <td>61</td>
      <td>2011/04/25</td>
      <td>$320,800</td>
    </tr>
    <tr>
      <td>Garrett Winters</td>
      <td>Accountant</td>
      <td>Tokyo</td>
      <td>63</td>
      <td>2011/07/25</td>
      <td>$170,750</td>
    </tr>
    <tr>
      <td>Ashton Cox</td>
      <td>Junior Technical Author</td>
      <td>San Francisco</td>
      <td>66</td>
      <td>2009/01/12</td>
      <td>$86,000</td>
    </tr>
    <tr>
      <td>Cedric Kelly</td>
      <td>Senior Javascript Developer</td>
      <td>Edinburgh</td>
      <td>22</td>
      <td>2012/03/29</td>
      <td>$433,060</td>
    </tr>
    <tr>
      <td>Airi Satou</td>
      <td>Accountant</td>
      <td>Tokyo</td>
      <td>33</td>
      <td>2008/11/28</td>
      <td>$162,700</td>
    </tr>
    <tr>
      <td>Brielle Williamson</td>
      <td>Integration Specialist</td>
      <td>New York</td>
      <td>61</td>
      <td>2012/12/02</td>
      <td>$372,000</td>
    </tr>
    <tr>
      <td>Herrod Chandler</td>
      <td>Sales Assistant</td>
      <td>San Francisco</td>
      <td>59</td>
 ...

JavaScript

/* Custom filtering function which will search data in column four between two values */
$.fn.dataTable.ext.search.push(
  function(settings, data, dataIndex) {
    var min = parseInt($('#min').val(), 10);
    var max = parseInt($('#max').val(), 10);
    var age = parseFloat(data[3]) || 0; // use data for the age column
    
    var num = $('#num').val();
    
    if (num.length > 0) {
    	console.log(num);
    	//need to parse num for <, >, =
      
      var val = num.split('>');
      
      if (val.length == 2) {
      	if (age > parseInt(val[1])) {
        	return true;
        }
      }
			val = num.split('<');
      
      if (val.length == 2) {
      	if (age < parseInt(val[1])) {
        	return true;
        }
      }
      
      val = num.split('=');
      
      if (val.length == 2) {
      	if (age == parseInt(val[1])) {
        	return true;
        }
      }
      
      return false;
    
    } else {
    

    	if ((isNaN(min) && isNaN(max)) ||
      	(isNaN(min) && age <= max) ||
      	(min <= age && isNaN(max)) ||
      	(min <= age && age <= max)) {
      	return true;
    	}
    	return false;
    }
  }
);

$(document).ready(function() {
  var table = $('#example').DataTable();

  // Event listener to the two range filtering inputs to redraw on input
  $('#min, #max, #num').keyup(function() {
    table.draw();
  });
table.columns('.text').every(function() {
  var this_column = this;
  $("input", this.footer()).on("keyup change", function() {
    if (this_column.search() !== this.value) {
      this_column.search("(^" + this.value + ")|( " + this.value + ")", true, false).draw();
    }
  });
});


});