Fixes #2436 - onChange should use string equality since input will be stored as string

RELEASE-NOTES.md

@@ -185,6 +185,7 @@
 - **Dropdown** - Fixed issue with matching boolean values, and using `set selected` with `true` or `false`
 - **Dropdown** - Fixed `search dropdown` submitting parent form when enter shortcut pressed
 - **Dropdown** - Fixed dropdown menu items should not center inside of a center aligned container.
+- **Dropdown** - Fixed some cases where onChange would not occur for values matching equality against '', for example `0`
 - **Form** - Form will no longer set a height for `textarea` using the `rows` property
 - **Form** - `inline fields` are now `1em` and do not match label's reduced size
 - **Form** - `field` inside `fields` no longer produce double sized margins.

src/definitions/modules/dropdown.js

@@ -2040,10 +2040,13 @@ $.fn.dropdown = function(parameters) {
               hasInput     = ($input.length > 0),
               isAddition   = !module.has.value(value),
               currentValue = module.get.values(),
+              stringValue  = (typeof value == 'number')
+                ? value.toString()
+                : value,
               newValue
             ;
             if(hasInput) {
-              if(value == currentValue) {
+              if(stringValue == currentValue) {
                 module.verbose('Skipping value update already same value', value, currentValue);
                 if(!module.is.initialLoad()) {
                   return;