Fixes #355 #359 #277 Issue with improper type check on dropdown default values

src/modules/dropdown.js

@@ -210,8 +210,12 @@ $.fn.dropdown = function(parameters) {
             click: function (event) {
               var
                 $choice = $(this),
-                text    = $choice.data(metadata.text)  || $choice.text(),
-                value   = $choice.data(metadata.value) || text.toLowerCase()
+                text    = ( $choice.data(metadata.text) !== undefined )
+                  ? $choice.data(metadata.text)
+                  : $choice.text(),
+                value   = ( $choice.data(metadata.value) !== undefined)
+                  ? $choice.data(metadata.value)
+                  : text.toLowerCase()
               ;
               if( $choice.find(selector.menu).size() === 0 ) {
                 module.determine.selectAction(text, value);
@@ -322,15 +326,21 @@ $.fn.dropdown = function(parameters) {
             ;
             value = (value !== undefined)
               ? value
-              : ( module.get.value() || module.get.text() )
+              : ( module.get.value() !== undefined)
+                ? module.get.value()
+                : module.get.text()
             ;
             if(value) {
               $item
                 .each(function() {
                   var
                     $choice       = $(this),
-                    optionText    = $choice.data(metadata.text)  || $choice.text(),
-                    optionValue   = $choice.data(metadata.value) || optionText.toLowerCase()
+                    optionText    = ( $choice.data(metadata.text) !== undefined )
+                      ? $choice.data(metadata.text)
+                      : $choice.text(),
+                    optionValue   = ( $choice.data(metadata.value) !== undefined )
+                      ? $choice.data(metadata.value)
+                      : optionText.toLowerCase()
                   ;
                   if( optionValue == value || optionText == value ) {
                     $selectedItem = $(this);
@@ -369,7 +379,10 @@ $.fn.dropdown = function(parameters) {
             ;
             if($selectedItem) {
               module.debug('Setting selected menu item to', $selectedItem);
-              selectedText = $selectedItem.data(metadata.text) || $selectedItem.text();
+              selectedText = ($selectedItem.data(metadata.text) !== undefined)
+                ? $selectedItem.data(metadata.text)
+                : $selectedItem.text()
+              ;
               $item
                 .removeClass(className.active)
               ;