datatables set width to 100 code example

Example 1: columndefs in datatable not working while setting width jquery

autoWidth: false

Example 2: datatables change width of columns

$('#example').dataTable( {
  "autoWidth": false, // might need this
  "columns": [
    { "width": "20%" },
    null, // automatically calculates
    null  // remaining width
  ]
} );