time suggestions

src/main/resources/static/js/helper.js

@@ -0,0 +1,30 @@
+resetValue = function(selector, value) {
+	$(selector).val(value);
+	$(selector).change();
+	return false;
+}
+
+nowPlus = function(summand) {
+	const roundToQuarter = date => new Date(Math.round(date / 9e5) * 9e5);
+	var now = roundToQuarter(new Date());
+	var wanted = new Date(now);
+	wanted.setMinutes(now.getMinutes() + summand);
+	return wanted.toLocaleTimeString('de', {
+		hour12: false,
+		hour: "numeric",
+		minute: "numeric"
+	});
+}
+
+validateTime = function(inputField, okButtonId) {
+	var value = inputField.value;
+	var regexPattern = /^([01]?[0-9]|2[0-3]):[0-5][0-9]$/;
+	var valid = value == "" ? true : regexPattern.test(value);
+	if (valid) {
+		$(inputField).css("background-color", "#cfc");
+		$("[id='" + okButtonId + "']").removeAttr('disabled');
+	} else {
+		$(inputField).css("background-color", "#fcc");
+		$("[id='" + okButtonId + "']").attr('disabled', 'disabled');
+	}
+}