Sum a column based on a condition in another column - datatables

Question

Is there any way to exclude rows from footer callback in this example :
I have the total sum of column 4(Salary) in the footer of all records.
Now I want to exclude rows that have names in column 3(Office) like - London, New York.
So now the sum needs to be for all rows except rows with these two cities.
$(document).ready(function() {
$('#example').DataTable( {
"footerCallback": function ( row, data, start, end, display ) {
var api = this.api();
// Remove the formatting to get integer data for summation
var intVal = function ( i ) {
return typeof i === 'string' ?
i.replace(/[\$,]/g, '')*1 :
typeof i === 'number' ?
i : 0;
};
// Total over all pages
total = api
.column( 4 )
.data()
.reduce( function (a, b) {
return intVal(a) + intVal(b);
}, 0 );
// Total over this page
pageTotal = api
.column( 4, { page: 'current'} )
.data()
.reduce( function (a, b) {
return intVal(a) + intVal(b);
}, 0 );
// Update footer
$( api.column( 4 ).footer() ).html(
'$'+pageTotal +' ( $'+ total +' total)'
);
}
} );
} );
Do I need to add classes in the rows have that names or? What is the best way to do it?

Answer 1

Working solution: https://jsfiddle.net/cmjp4b3a/
$(document).ready(function() {
$('#example').DataTable( {
"footerCallback": function ( row, data, start, end, display ) {
var api = this.api();
// Remove the formatting to get integer data for summation
var intVal = function ( i ) {
return typeof i === 'string' ?
i.replace(/[\$,]/g, '')*1 :
typeof i === 'number' ?
i : 0;
};
// Total over all pages
total = api
.column(4)
.data()
.reduce(function (a, b) {
var cur_index = api.column(4).data().indexOf(b);
if (api.column(3).data()[cur_index] != "London" && api.column(3).data()[cur_index] != "New York") {
return intVal(a) + intVal(b);
}
else { return intVal(a); }
}, 0)
// Total over this page
pageTotal = api
.column( 4, { page: 'current'} )
.data()
.reduce(function (a, b) {
var cur_index = api.column(4).data().indexOf(b);
if (api.column(3).data()[cur_index] != "London" && api.column(3).data()[cur_index] != "New York") {
return intVal(a) + intVal(b);
}
else { return intVal(a); }
}, 0)
// Update footer
$( api.column( 4 ).footer() ).html(
'$'+pageTotal +' ( $'+ total +' total)'
);
}
} );
} );