Merge pull request #455 from DivvyHQ/master

Normalized scroll sensibility

jquery.datetimepicker.js

@@ -611,6 +611,7 @@
 		disabledWeekDays: [],
 		yearOffset: 0,
 		beforeShowDay: null,
+		scrollSensitivity: 180, // milliseconds
 
 		enterLikeTab: true,
 		showApplyButton: false
@@ -1863,8 +1864,42 @@
 					}
 				});
 
+			/**
+			 * Returns a function, that, when invoked, will only be triggered at most once during a given window of time.
+			 *
+			 * Taken from underscore.js (https://github.com/jashkenas/underscore).
+			 *
+			 * @param {Function} func
+			 * @param {number} wait
+			 * @returns {Function}
+			 */
+			throttle = function(func, wait) {
+				var context, args, timeout, result;
+				var previous = 0;
+				var later = function() {
+					previous = new Date;
+					timeout = null;
+					result = func.apply(context, args);
+				};
+				return function() {
+					var now = new Date;
+					var remaining = wait - (now - previous);
+					context = this;
+					args = arguments;
+					if (remaining <= 0) {
+						clearTimeout(timeout);
+						timeout = null;
+						previous = now;
+						result = func.apply(context, args);
+					} else if (!timeout) {
+						timeout = setTimeout(later, remaining);
+					}
+					return result;
+				};
+			};
+
 			datepicker
-				.on('mousewheel.xdsoft', function (event) {
+				.on('mousewheel.xdsoft', throttle(function (event) {
 					if (!options.scrollMonth) {
 						return true;
 					}
@@ -1874,10 +1909,10 @@
 						_xdsoft_datetime.prevMonth();
 					}
 					return false;
-				});
+				}, options.scrollSensitivity));
 
 			input
-				.on('mousewheel.xdsoft', function (event) {
+				.on('mousewheel.xdsoft', throttle(function (event) {
 					if (!options.scrollInput) {
 						return true;
 					}
@@ -1899,7 +1934,7 @@
 						datetimepicker.trigger('changedatetime.xdsoft');
 						return false;
 					}
-				});
+				}, options.scrollSensitivity));
 
 			datetimepicker
 				.on('changedatetime.xdsoft', function (event) {