I am using the dataTables plugin and re-using code I have on another page to have a select
that filters one specific column. When this failed to filter correctly I was confused as it's the same code I've used previously.
Upon inspection, I have now just discovered that the cause is using child rows with dataTables - http://datatables.net/examples/api/row_details.html
HTML
<select name="col4_filter" id="col4_filter">
<option value="">All</option>
<!-- Other Options -->
</select>
<table>
<thead>
<tr>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
<th>6</th>
</tr>
</thead>
<tbody>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
jQuery (quite a lot but all dataTables related)
if (!jQuery().dataTable) {
return;
}
/*
* Insert a 'details' column to the table
*/
var nCloneTh = document.createElement('th');
var nCloneTd = document.createElement('td');
nCloneTd.innerHTML = '<span class="row-details row-details-close"></span>';
$('table thead tr').each(function() {
this.insertBefore(nCloneTh, this.childNodes[0]);
});
$('table tbody tr').each(function() {
this.insertBefore(nCloneTd.cloneNode(true), this.childNodes[0]);
});
var oTable = $('table').dataTable({
"sDom": 'T<"clear">lfrtip',
"aaSorting": [],
"aLengthMenu": [
[15, 20, -1],
[15, 20, "All"] // change per page values here
],
// set the initial value
"iDisplayLength": 15,
"sPaginationType": "bootstrap",
"oLanguage": {
"sLengthMenu": "_MENU_ records",
"oPaginate": {
"sPrevious": "Prev",
"sNext": "Next"
}
}
});
/* Formatting function for row details */
function fnFormatDetails (oTable, nTr, row_id) {
var id = row_id.split('_').pop();
var sOut = '<table>';
sOut += '<tr><td id="details_' + id + '">Finding Child Rows... <img src="/images/portal/loading.gif" alt="Finding Child Rows..." /></td></tr>';
sOut += '</table>';
$.ajax({
type: 'GET',
url: '/ajax_find_child_rows',
dataType: "html",
data: { id: id },
success: function(data) {
$('#details_' + id).html(data);
},
error: function() {
$('#details_' + id).html('No child rows found');
}
});
return sOut;
}
/* Add event listener for opening and closing details
* Note that the indicator for showing which row is open is not controlled by DataTables,
* rather it is done here
*/
$('table').on('click', 'tbody td .row-details', function() {
var nTr = $(this).parents('tr')[0];
if (oTable.fnIsOpen(nTr)) {
/* This row is already open - close it */
$(this).addClass("row-details-close").removeClass("row-details-open");
oTable.fnClose(nTr);
} else {
/* Open this row */
var row_id = ($(this).parent().parent().attr('id'));
$(this).addClass("row-details-open").removeClass("row-details-close");
oTable.fnOpen(nTr, fnFormatDetails(oTable, nTr, row_id), 'details');
}
});
function fnFilterColumn(i) {
oTable.fnFilter($('#col'+(i+1)+'_filter').val(), i);
}
$("#col4_filter").change( function() { fnFilterColumn(3); });
The symptoms were that the filter failed to work and reset when a blank option was selected.
e.g. just adding one to the index doesn't work:
$("#col4_filter").change( function() { fnFilterColumn(4); }); // 4 instead of 3 (selector doesn't matter just now)
and after resetting the select
after the failed filter, the filter doesn't reset.
The weird thing is that if I use the previous column ($("#col4_filter").change( function() { fnFilterColumn(2); });
) then it will work for some reason.
I'm guessing that the column insertion is messing up the filter because the index of the column is off.