Sorting (alphabetical order) to ignore empty cells : dataTables

Question

So the question has already been asked here, but the solution doesn\'t work for me (I might do something wrong). I want to sort my tables by alphabetical order (\"type\" : \

Answer 1

UPDATE: Embedded Stack Snippet.

I think the aoColumns is a legacy option for DataTables v 1.9. That being said, you might also need to use $.extend to include your custom sort functions.

Please take a look at the Stack Snippet below, or this live demo on jsfiddle. In a nutshell, I define the name column as the type non-empty-string during the table initalization. Then I extended the jQuery.fn.dataTableExt.oSort API with a non-empty-string-asc and a non-empty-string-desc sorting functions. See if this is what you are looking for.

Stack Snippet:

jQuery.extend( jQuery.fn.dataTableExt.oSort, {
    "non-empty-string-asc": function (str1, str2) {
        if(str1 == "")
            return 1;
        if(str2 == "")
            return -1;
        return ((str1 < str2) ? -1 : ((str1 > str2) ? 1 : 0));
    },
 
    "non-empty-string-desc": function (str1, str2) {
        if(str1 == "")
            return 1;
        if(str2 == "")
            return -1;
        return ((str1 < str2) ? 1 : ((str1 > str2) ? -1 : 0));
    }
} );


var dataTable = $('#example').dataTable({
    columnDefs: [
       {type: 'non-empty-string', targets: 0} // define 'name' column as non-empty-string type
    ]
});
dataTable.api().row.add(['John Smith', 'Intern', 'San Francisco', 19, 2011/05/25, 62000]).draw();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://cdn.datatables.net/1.10.2/js/jquery.dataTables.min.js"></script>
<link href="http://cdn.datatables.net/1.10.2/css/jquery.dataTables.css" rel="stylesheet"/>

<table id="example" class="display" cellspacing="0" width="100%">
    <thead>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
        </tr>
        <tr>
            <td>Garrett Winters</td>
            <td>Accountant</td>
            <td>Tokyo</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$170,750</td>
        </tr>
        <tr>
            <td>Ashton Cox</td>
            <td>Junior Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$86,000</td>
        </tr>
        <tr>
            <td>Cedric Kelly</td>
            <td>Senior Javascript Developer</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2012/03/29</td>
            <td>$433,060</td>
        </tr>
        
        <tr>
            <td></td>
            <td>Junior Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$86,000</td>
        </tr>
        <tr>
            <td></td>
            <td>Senior Javascript Developer</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2012/03/29</td>
            <td>$433,060</td>
        </tr>
        
    </tbody>
</table>

Answer 2

Ok I found a solution for my second problem , see Here

So destroy the dataTable just before my ajax request and rebuild it on success :

    else{
        // Destroy dataTable
        $('#classement').dataTable().fnDestroy();
        $.ajax({
            type: "POST",
            url: "ajax.php",
            data: {},
            success: function(msg){
                // Reload dataTable with sorting
                $('#classement').dataTable({
                    columnDefs: [
                       {type: 'non-empty-string', targets: [2,3]} // define 'name' column as non-empty-string type
                    ]
                });
            }
        });
    }

Example : JsFiddle