/* - table_sorter_alt.js - */

/********* Table sorter script *************/

function sortable(a) {
// convert a to something sortable
// A number, but not a date?
if (a.charAt(4) != '-' && a.charAt(7) != '-' && !isNaN(parseFloat(a)))
return parseFloat(a);
return a.toLowerCase();
}

function sort() {
var name = jq(this).text();
var table = jq(this).parents('table:first');
var tbody = table.find('tbody:first');
var reverse = table.attr('sorted') == name;

jq(this).parent().find('th:not(.nosort) img.sortdirection')
.attr('src', portal_url + '/arrowBlank.gif');
jq(this).children('img.sortdirection').attr('src', portal_url +
(reverse ? '/arrowDown.gif' : '/arrowUp.gif'));

var index = jq(this).parent().children('th').index(this);
var data = [];
tbody.find('tr').each(function() {
var cells = jq(this).children('td');
data.push([
sortable(cells.slice(index,index+1).text()),
// crude way to sort by surname and name after first choice
sortable(cells.slice(1,2).text()), sortable(cells.slice(0,1).text()),
this]);
});

if (data.length) {

	sortLC = function(aa, bb) {
		if (typeof aa === 'string' && typeof bb === 'string') {
			return aa.localeCompare(bb);
		}
	};
	data.sort();
	if (reverse) data.reverse();
	table.attr('sorted', reverse ? '' : name);
	
	// appending the tr nodes in sorted order will remove them from their old ordering
	tbody.append(jq.map(data, function(a) { return a[3]; }));
	// jquery :odd and :even are 0 based
	tbody.find('tr').removeClass('odd').removeClass('even')
	.filter(':odd').addClass('even').end()
	.filter(':even').addClass('odd');
}
}

jq(function() {
// set up blank spaceholder gif
var blankarrow = jq('<img>')
.attr('src', portal_url + '/arrowBlank.gif')
.attr('width', 6).attr('height', 9).addClass('sortdirection');
// all listing tables not explicitly nosort, all sortable th cells
// give them a pointer cursor and blank cell and click event handler
// the first one of the cells gets a up arrow instead.
jq('table.listing:not(.nosort) thead th:not(.nosort)')
.append(blankarrow.clone())
.css('cursor', 'pointer')
.click(sort)
.slice(0, 1)
.find('img.sortdirection').attr('src', portal_url + '/arrowUp.gif');
});