function enableloadingspinner() {
	$('#loading').show();
}

function disableloadingspinner() {
	$('#loading').hide();
}

function navigate(url) {
	if(prompt_save_from_selector == 'true' && selection_exists == 'true' && item_save_privilege == 'true') {
		opensaveconfirm(url);
	} else {
		//do not save item, just forward to url page
		window.top.location.href = url;
	}
}

function closeprojectheaders(itemnumberlabel) {
	submitheaders(itemnumberlabel);
	$('#project_headers').foundation('close');
	return false;
}

function submitheaders(itemnumberlabel) {
	$.ajax({
		url : context_path+"/ajax/datasheet/headers",
		type : 'post',
		data : getheadersstate(),
		success : function(data) {
			var itemnumber = data.itemnumber;
			var needtoupdate = $('.js-update-itemnumber');
			needtoupdate.filter(':not(:input)').each(function() {
				$(this).text(itemnumber);
			});
			needtoupdate.filter(':input').each(function() {
				$(this).val(itemnumber);
			});
			$('#itemnumberheader').text(itemnumberlabel + ':  ' + itemnumber);
			//$(document).foundation();
			refreshschedule();
            if (typeof updateheaderforperformancedatasheet === "function") {
            	updateheaderforperformancedatasheet();
            }
            },
		error : function(xhr, status, error) {
			alert('error submitting headers!'
					+ '\n  status: ' + status
					+ '\n  error: ' + error);
		}
	});
}

function getheadersstate() {
	var state = {};
	$('#project_headers :input:enabled')
	.filter(':not(:checkbox), :checkbox:checked')
	.each(function() {
		var that = $(this);
		state[that.attr('name')] = that.val();
	})
	state['recalcmode'] = 'true';
    state['quantityofpumpsdirty'] = $('[name="quantityofpumpsdirty"]').val();
	return state;
}

function saveornavigate(url) {
	if($("#saveworkconfirmdialog").dialog( "isopen" )) {
		$("#confirmsave").attr("disabled","disabled");
		$("#confirmdiscard").attr("disabled","disabled");
		$("#confirmcancel").attr("disabled","disabled");
	}	
	if(typeof saveandnavigate == 'function') {
		//save item
		saveandnavigate(url);
	} else {
		//save not supported on this page, eg- cos page, in this case just forward to url page
		var confirmation =  confirm(no_save_page_save_alert_1 + '\n' + no_save_page_save_alert_2 + ' ' + performance_datasheet + ' ' + no_save_page_save_alert_3);
		if(confirmation == true) {
			window.top.location.href = url;
		} else {
			return false;
		}
	}
}

function opensaveconfirm(url) {
	$("#saveworkconfirmdialog").dialog("open");
	$("#confirmsave").click( function() { saveornavigate(url); } );
	$("#confirmdiscard").click( function() { window.top.location.href = url; } );
	$("#confirmcancel").click( function() {
	    unbindsaveworkconfirmdialogeventhandlers();
	    $("#saveworkconfirmdialog").dialog("close");
	});
	$("#confirmsave").focus();						
}