how to sort a column with ngx-datatable?

Question

I created an table, everything is fine but the problem is I can't sort the data (asc or desc), do I have to create some other code in typeScript or what exactly should I do ?

<ngx-datatable
                #table
                [rowHeight]="'auto'"
                [headerHeight]="'auto'"
                [footerHeight]="40"
                [externalSorting]="true"
                [externalPaging]="true"
                [rows]="data"
                [count]="totalElements"
                [offset]="pageNum"
                [limit]="size"
                (page)="upPage($event)"
                columnMode="force">
               <ngx-datatable-column
                    [name]="userDataTable.lastname" prop="lastName" cellClass="font-weight-bold">
                    <ng-template let-user="row" ngx-datatable-cell-template>
                        <p>{{ user.lastName }}</p>
                    </ng-template>
                </ngx-datatable-column>

...

</ngx-datatable>

Answer 1

You declared a column with ngx-datatable-cell-template and it's maybe disabling the sorting.
First make sure that sorting is enabled by setting the column option sortable to true (but I think this is the default value ...).
You can in all cases affect a custom sorting function to any column thanks to the column options (with comparator attribute).
Check the ngx-datatable example source code here .
Hope that will help you !