Enhanced multiSelect jquery plugin.

core/css/multiselect.css

@@ -5,8 +5,6 @@
  ul.multiselectoptions {
  	background-color:#fff;
  	border:1px solid #ddd;
- 	border-bottom-left-radius:.5em;
- 	border-bottom-right-radius:.5em;
  	border-top:none;
  	box-shadow:0 1px 1px #ddd;
  	padding-top:.5em;
@@ -14,6 +12,16 @@
  	z-index:49;
  }
 
+ ul.multiselectoptions.down {
+ 	border-bottom-left-radius:.5em;
+ 	border-bottom-right-radius:.5em;
+ }
+
+ ul.multiselectoptions.up {
+ 	border-top-left-radius:.5em;
+ 	border-top-right-radius:.5em;
+ }
+
  ul.multiselectoptions>li {
  	overflow:hidden;
  	white-space:nowrap;
@@ -30,11 +38,20 @@
 
  div.multiselect.active {
  	background-color:#fff;
+ 	position:relative;
+ 	z-index:50;
+ }
+
+ div.multiselect.up {
+ 	border-top:0 none;
+ 	border-top-left-radius:0;
+ 	border-top-right-radius:0;
+ }
+
+ div.multiselect.down {
  	border-bottom:none;
  	border-bottom-left-radius:0;
  	border-bottom-right-radius:0;
- 	position:relative;
- 	z-index:50;
  }
 
  div.multiselect>span:first-child {

core/js/multiselect.js

@@ -1,3 +1,13 @@
+/**
+ * @param 'createCallback' A function to be called when a new entry is created. Only argument to the function is the value of the option.
+ * @param 'createText' The placeholder text for the create action.
+ * @param 'title' The title to show if no options are selected.
+ * @param 'checked' An array containing values for options that should be checked. Any options which are already selected will be added to this array.
+ * @param 'labels' The corresponding labels to show for the checked items.
+ * @param 'oncheck' Callback function which will be called when a checkbox/radiobutton is selected. If the function returns false the input will be unchecked.
+ * @param 'onuncheck' @see 'oncheck'.
+ * @param 'singleSelect' If true radiobuttons will be used instead of checkboxes. 
+ */
 (function( $ ){
 	var multiSelectId=-1;
 	$.fn.multiSelect=function(options){
@@ -5,16 +15,25 @@
 		var settings = {
 			'createCallback':false,
 			'createText':false,
+			'singleSelect':false,
 			'title':this.attr('title'),
 			'checked':[],
+			'labels':[],
 			'oncheck':false,
 			'onuncheck':false,
 			'minWidth': 'default;',
 		};
 		$.extend(settings,options);
 		$.each(this.children(),function(i,option){
+			// If the option is selected, but not in the checked array, add it.
 			if($(option).attr('selected') && settings.checked.indexOf($(option).val()) == -1){
 				settings.checked.push($(option).val());
+				settings.labels.push($(option).text().trim());
+			}
+			// If the option is in the checked array but not selected, select it.
+			else if(settings.checked.indexOf($(option).val()) !== -1 && !$(option).attr('selected')){
+				$(option).attr('selected', 'selected');
+				settings.labels.push($(option).text().trim());
 			}
 		});
 		var button=$('<div class="multiselect button"><span>'+settings.title+'</span><span>▾</span></div>');
@@ -30,18 +49,31 @@
 		button.css('min-width',settings.minWidth);
 		settings.minOuterWidth=button.outerWidth()-2;
 		button.data('settings',settings);
-		if(settings.checked.length>0){
+
-			button.children('span').first().text(settings.checked.join(', '));
+		if(!settings.singleSelect && settings.checked.length>0){
+			//button.children('span').first().text(settings.checked.join(', '));
+			button.children('span').first().text(settings.labels.join(', '));
+		} else if(settings.singleSelect) {
+			button.children('span').first().text(this.find(':selected').text());
 		}
 
+		var self = this;
+		self.menuDirection = 'down';
 		button.click(function(event){
 			
 			var button=$(this);
 			if(button.parent().children('ul').length>0){
+				if(self.menuDirection === 'down') {
 					button.parent().children('ul').slideUp(400,function(){
 						button.parent().children('ul').remove();
 						button.removeClass('active');
 					});
+				} else {
+					button.parent().children('ul').fadeOut(400,function(){
+						button.parent().children('ul').remove();
+						button.removeClass('active').removeClass('up');
+					});
+				}
 				return;
 			}
 			var lists=$('ul.multiselectoptions');
@@ -54,15 +86,19 @@
 			event.stopPropagation();
 			var options=$(this).parent().next().children();
 			var list=$('<ul class="multiselectoptions"/>').hide().appendTo($(this).parent());
+			var inputType = settings.singleSelect ? 'radio' : 'checkbox';
 			function createItem(element,checked){
 				element=$(element);
 				var item=element.val();
 				var id='ms'+multiSelectId+'-option-'+item;
-				var input=$('<input type="checkbox"/>');
+				var input=$('<input type="' + inputType + '"/>');
 				input.attr('id',id);
+				if(settings.singleSelect) {
+					input.attr('name', 'ms'+multiSelectId+'-option');
+				}
 				var label=$('<label/>');
 				label.attr('for',id);
-				label.text(item);
+				label.text(element.text() || item);
 				if(settings.checked.indexOf(item)!=-1 || checked){
 					input.attr('checked',true);
 				}
@@ -70,33 +106,41 @@
 					settings.checked.push(item);
 				}
 				input.change(function(){
-					var groupname=$(this).next().text();
+					var value = $(this).attr('id').substring(String('ms'+multiSelectId+'-option').length+1);
+					var label = $(this).next().text().trim();
 					if($(this).is(':checked')){
+						if(settings.singleSelect) {
+							settings.checked = [];
+							settings.labels = [];
+							$.each(self.find('option'), function() {
+								$(this).removeAttr('selected');
+							});
+						}
 						element.attr('selected','selected');
 						if(settings.oncheck){
-							if(settings.oncheck(groupname)===false){
+							if(settings.oncheck(value)===false){
 								$(this).attr('checked', false);
 								return;
 							}
 						}
-						settings.checked.push(groupname);
+						settings.checked.push(value);
+						settings.labels.push(label);
 					}else{
-						var index=settings.checked.indexOf(groupname);
+						var index=settings.checked.indexOf(value);
 						element.attr('selected',null);
 						if(settings.onuncheck){
-							if(settings.onuncheck(groupname)===false){
+							if(settings.onuncheck(value)===false){
 								$(this).attr('checked',true);
 								return;
 							}
 						}
 						settings.checked.splice(index,1);
+						settings.labels.splice(index,1);
 					}
 					var oldWidth=button.width();
-					if(settings.checked.length>0){
+					button.children('span').first().text(settings.labels.length > 0 
-						button.children('span').first().text(settings.checked.join(', '));
+						? settings.labels.join(', ')
-					}else{
+						: settings.title);
-						button.children('span').first().text(settings.title);
-					}
 					var newOuterWidth=Math.max((button.outerWidth()-2),settings.minOuterWidth)+'px';
 					var newWidth=Math.max(button.width(),settings.minWidth);
 					var pos=button.position();
@@ -123,7 +167,7 @@
 					var input=$('<input class="new">');
 					li.append(input);
 					input.focus();
-					input.css('width',button.width());
+					input.css('width',button.innerWidth());
 					button.parent().data('preventHide',true);
 					input.keypress(function(event) {
 						if(event.keyCode == 13) {
@@ -132,7 +176,7 @@
 							var value = $(this).val();
 							var exists = false;
 							$.each(options,function(index, item) {
-								if ($(item).val() == value) {
+								if ($(item).val() == value || $(item).text() == value) {
 									exists = true;
 									return false;
 								}
@@ -143,15 +187,18 @@
 							var li=$(this).parent();
 							$(this).remove();
 							li.text('+ '+settings.createText);
-							li.before(createItem(this));
+							li.before(createItem(this, true));
+							if(self.menuDirection === 'up') {
+							var list = li.parent();
+								list.css('top', list.position().top-li.outerHeight());
+							}
 							var select=button.parent().next();
 							var option=$('<option selected="selected"/>');
-							option.attr('value',value);
-							option.text($(this).val());
 							select.append(option);
+							option.text($(this).val());
 							li.prev().children('input').trigger('click');
 							button.parent().data('preventHide',false);
-							if(settings.createCallback){
+							if(typeof settings.createCallback === 'function'){
 								settings.createCallback($(this).val());
 							}
 						}
@@ -169,20 +216,41 @@
 				list.append(li);
 			}
 			var pos=button.position();
+			if($(document).height() > button.offset().top+button.outerHeight() + list.children().length * button.height()) {
 				list.css('top',pos.top+button.outerHeight()-5);
 				list.css('left',pos.left+3);
 				list.css('width',(button.outerWidth()-2)+'px');
+				list.addClass('down');
+				button.addClass('down');
 				list.slideDown();
+			} else {
+				list.css('top', pos.top - list.height());
+				list.css('left', pos.left+3);
+				list.css('width',(button.outerWidth()-2)+'px');
+				list.detach().insertBefore($(this));
+				list.addClass('up');
+				button.addClass('up');
+				list.fadeIn();
+				self.menuDirection = 'up';
+			}
 			list.click(function(event){
 				event.stopPropagation();
 			});
 		});
 		$(window).click(function(){
 			if(!button.parent().data('preventHide')){
+				// How can I save the effect in a var?
+				if(self.menuDirection === 'down') {
 					button.parent().children('ul').slideUp(400,function(){
 						button.parent().children('ul').remove();
-					button.removeClass('active');
+						button.removeClass('active').removeClass('down');
 					});
+				} else {
+					button.parent().children('ul').fadeOut(400,function(){
+						button.parent().children('ul').remove();
+						button.removeClass('active').removeClass('up');
+					});
+				}
 			}
 		});