Implement due dates for cards

Signed-off-by: Julius Härtl <jus@bitgrid.net>

js/directive/datepicker.js

@@ -0,0 +1,50 @@
+/*
+ * @copyright Copyright (c) 2017 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 of the
+ *  License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+app.directive('datepicker', function () {
+	'use strict';
+	return {
+		link: function (scope, elm, attr) {
+			return elm.datepicker({
+				dateFormat: "yy-mm-dd",
+				onSelect: function(date, inst) {
+					scope.setDuedate(moment(date));
+					scope.$apply();
+				},
+				beforeShow: function(input, inst) {
+					var dp, marginLeft;
+					dp = $(inst).datepicker('widget');
+					marginLeft = -Math.abs($(input).outerWidth() - dp.outerWidth()) / 2 + 'px';
+					dp.css({
+						'margin-left': marginLeft
+					});
+					$("div.ui-datepicker:before").css({
+						'left': 100 + 'px'
+					});
+					return $('.hasDatepicker').datepicker();
+				},
+				minDate: null
+			});
+		}
+
+	}
+});