table.columns is not a function in datatable.js

Answer 1

Try something like this

var table = $('#sample_3').dataTable();
$('#sample_3 tfoot th').each(function (i) 
{

            var title = $('#sample_3 thead th').eq($(this).index()).text();
            // or just var title = $('#sample_3 thead th').text();
            var serach = '';
            $(this).html('');
            $(serach).appendTo(this).keyup(function(){table.fnFilter($(this).val(),i)})
});