javascript - unable to display sum in footer using datatable -


i have created datatable using jquery. table has 7 columns , among 1 column grand total (column 6). have display sum of grand total (column 6) in grand total (column 6) @ bottom of grand total (column 6).

how can that? have tried code nothing worked. outout blank column. here code found. below html code

html 

<table class="display table table-bordered table-striped" id="dynamic-table">   <thead>     <tr>       <th>invoice type</th>       <th>invoice no</th>       <th>invoice date</th>       <th>customer name</th>       <th>city </th>       <th>grand total</th>       <th class="hidden-phone">action</th>     </tr>   </thead>   <tbody>   </tbody>   <tfoot>     <tr>       <th></th>       <th></th>       <th></th>       <th></th>       <th>total:</th>       <th></th>       <th></th>     </tr>   </tfoot> </table>

javascript

function load_datatable() {   var data = $('input[name=report]:checked').val();   var date = $('#rep_date').val();   var type = $('#type_id').val();   datatable = $("#dynamic-table").datatable({     "bautowidth": false,     "bfilter": true,     "bsort": true,     "bprocessing": true,     "bdestroy": true,      "bserverside": true,     "olanguage": {       "slengthmenu": "_menu_",       "sprocessing": "<img src='" + root_domain + "img/loading.gif'/> loading ...",       "semptytable": "no data added yet !",     },     "alengthmenu": [       [10, 20, 30, 50],       [10, 20, 30, 50]     ],     "idisplaylength": 10,     "sajaxsource": root_domain + 'app/invoice/',     "fnserverparams": function(aodata) {       aodata.push({         "name": "mode",         "value": "fetch"       }, {         "name": "report",         "value": data       }, {         "name": "type_id",         "value": type       }, {         "name": "date",         "value": date       });     },     "footercallback": function(row, data, start, end, display) {       var api = this.api(),         data;        // remove formatting integer data summation       var intval = function(i) {         return typeof === 'string' ?           i.replace(/[\$,]/g, '') * 1 :           typeof === 'number' ?           : 0;       };       // total on page       pagetotal = api         .column(5, {           page: 'current'         })         .data()         .reduce(function(a, b) {           return intval(a) + intval(b);         }, 0);       console.log(pagetotal);       // update footer       $(api.column(5).footer()).html('$' + pagetotal);     },     "fndrawcallback": function(osettings) {       $('.ttip, [data-toggle="tooltip"]').tooltip();     }   }).fnsetfilteringdelay();    //search input style   $('.datatables_filter input').addclass('form-control').attr('placeholder', 'search');   $('.datatables_length select').addclass('form-control'); }


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