在jQuery Datatable中选择一行时如何检测空表

Question

Giving a simple table like this

<table id="exampleTable" class="table hover nowrap">
   <thead>
      <tr>
         <th>Id</th>
         <th>Name</th>
      </tr>
   </thead></table>

Also, using the jQuery Datatable plugin and making the rows selectable, like in this example . The Javascript goes like this:

var exampleTable = $("#exampleTable").DataTable(
                    {
                        "bDestroy": true,
                        "lengthChange": false,
                        "bPaginate": false
                    });

$('#exampleTable tbody').on( 'click', 'tr', function () {
        if ( $(this).hasClass('selected') ) {
            $(this).removeClass('selected');
        }
        else {
            $('#exampleTable tr.selected').removeClass('selected');
            $(this).addClass('selected');
        }
    } );

So, when the table is empty, it shows a selectable row which says something like:

No data available in table

How to detect the table is empty and not allow selection on that kind of "message rows"?

Here is a fiddle with the code.

Answer 1

you can check if there is td with the class dataTables_empty like this:

$('#exampleTable tbody').on( 'click', 'tr', function () {
        if ( $(this).hasClass('selected')) {
            $(this).removeClass('selected');
        }
        else if(! $(this).find('td.dataTables_empty').length){
            $('#exampleTable').DataTable().rows().nodes().each(function(){
               $(this).removeClass('selected');
            });
            $(this).addClass('selected');
        }
    } );

Answer 2

You can use the - .row().data() method to see if there is data. if this returns undefined, you can disable selection of the row.

i also think this would be an ideal solution instead of dom traversal which is more expensive. what do you guys think ?

below is the updated fiddle. you can comment the tbody from the html to test it.

Let me know if this helps.

Modified Fiddle

Answer 3

inside your click method, add before everything

if($('#exampleTable tbody tr td').length == 1){
      return;
    }