Question

I want to establish some fixed rows in head of the datatable.

This is my datatable settings:

var oTable = $('#transactions').dataTable( {
    "aaSorting": [ [0,'desc'] ],
    "bFilter": false,
    "bSort": true, 
    "aaSorting": [[3,'desc']], // default search colums
    //            "aaSortingFixed": [[3,'desc']],
    "bPaginate": true,
    "bProcessing": true,
    "sPaginationType": "full_numbers",
    "asStripeClasses": [ 'monitoring-table-new' ],
    "bAutoWidth": false,
    "aoColumns": [
        {   "sType": "custom",
            "sClass": "td-date-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="date"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-transaction-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="transaction"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-client-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="client"><div>' + sVal + '</div></span></div></div>';
            } 
        },
        {   "sType": "custom",
            "sClass": "td-value-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="value"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-status-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="status"><div>' + sVal + '</div></span></div></div>';
            }
        },
    ],
    "sAjaxSource": '<?php echo url_for('@test?sf_format=json'); ?>',  

} );

I have done in the following way:

   jQuery.fn.dataTableExt.oSort['custom-asc']  = function(x,y) {
        if (x.indexOf("MY VALUE") != -1) return -1; // keep this row at top
        if (y.indexOf("MY VALUE") != -1) return 1; // keep this row at top

        return ((x < y) ? -1 : ((x > y) ?  1 : 0));
    };

    jQuery.fn.dataTableExt.oSort['custom-desc'] = function(x,y) {
        if (x.indexOf("MY VALUE") != -1) return 1; // keep this row at top
        if (y.indexOf("MY VALUE") != -1) return -1; // keep this row at top

        return ((x < y) ?  1 : ((x > y) ? -1 : 0));
    };

This will keep in top position the rows which have “MY VALUE” in text. But the problem is that when I sort on other column, the “fixed” row is not remaining on top of the table.

Any solutions?

Answer 1

This is not easy, one thing you could do is mix your custom sorting with a custom datasource sorting tha customizes your datasource

// var oTable;
var onTopValues = new Array("Litige", "5410");

/*  disable asc sorting for specific rows */
jQuery.fn.dataTableExt.oSort['custom-asc']  = function(x,y) {

        if (isOnTop(x)) return -1; // keep this row at top
        if (isOnTop(y)) return 1; // keep this row at top

        return ((x < y) ? -1 : ((x > y) ?  1 : 0));
};

jQuery.fn.dataTableExt.oSort['custom-desc'] = function(x,y) {
        if (isOnTop(x)) return -1; // keep this row at top
        if (isOnTop(y)) return 1; // keep this row at top

        return ((x < y) ?  1 : ((x > y) ? -1 : 0));
};

function isOnTop(s) {
        // search for on top values
        for (var i = 0; i < onTopValues.length; i++) {
          if (s === onTopValues[i]) {
            return true; 
          }
        }

        return false;
}
//custom datasource
$.fn.dataTableExt.afnSortData['custom-ontop'] = function  ( oSettings, iColumn )
{
  var aData = [];
  //prepare the data
  $('td:eq('+iColumn+')',  oSettings.oApi._fnGetTrNodes(oSettings)).each(function(){
    //If the last column of this row should stay on top, return the value of the 
    //last row as datasource
    if(isOnTop($(this).closest('tr').find('td:last').text())){
       aData.push($(this).closest('tr').find('td:last').text());
    }else{
        //otherwise return this row as datasource
         aData.push($(this).text());
    }
  });

  return aData;
};


$(document).ready(function() {

          /* Apply custom classes to table headers */
        $.fn.dataTableExt.oStdClasses.sSortAsc = "custom_asc";
        $.fn.dataTableExt.oStdClasses.sSortDesc = "custom_desc";


  oTable = $('#transactions').dataTable({       
        "aoColumnDefs": [ { aTargets: [0,1,2,3], sType: "custom"}] ,
         "aoColumns": [
                { "sSortDataType": "custom-ontop" },
                { "sSortDataType": "custom-ontop" },
                { "sSortDataType": "custom-ontop" },
                { "sSortDataType": "custom-ontop" },
                { "sSortDataType": "custom-ontop" }
            ],
        "aaSorting": [],
        "aaData": [
            [ "2012-01-2", "2", "Local <br>0312313213", 20, "Litige" ],
            [ "2012-03-22", "25", "Local <br>35313313213", 5540, "Valid" ],
            [ "2012-01-2", "2", "Local <br>0312313213", 10, "Valid" ],
            [ "2012-03-22", "25", "Local <br>35313313213", 5410, "Valid" ]
        ]
    });    
});

Basically you are still using your sorting function but you pass them a custom datasource that forces the values to stay on top. This assume that you are sorting on the last column, but you can add your logic to it.

http://jsbin.com/eroyac/4/edit#preview