title: Datatables filter based on number value on button click
body: <p>I have this "filter" for datatables which works great to find a string in a specific column:</p>
  
  <pre><code>$(document).ready(function() {
  $("#sort_me").click( function()
  {
  var table = $('#occupations_datatable').DataTable();
  table
    .search( '' )
    .columns(0 ).search( 'Architect' )
    .draw();
  } );
  } );
  </code></pre>
  
  <p>What I'd like to do is instead "search" a different column for all numbers greater than, say, 20. Column 3 in my dataset is all integers and I want someone to be able to click on a button and filter the chart to only show rows where column 3 values are great than a certain number. I tried this, but it doesn't work:</p>
  
  <pre><code>$(document).ready(function() {
  $("#sort_me").click( function()
  {
  var table = $('#occupations_datatable').DataTable();
  table
    .columns(3).filter( function ( value, index ) {
    return value &gt; 20;
  })
  .draw();
  } );
  } );
  </code></pre>
  
  <p>I get no errors, but the table doesn't filter itself either. What am I missing here?</p>