5 files changed, 38 insertions, 13 deletions
diff --git a/js/src/collapse.js b/js/src/collapse.js
index bf9c990ec..fa082f133 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -33,7 +33,7 @@ const Collapse = (() => {
 
   const DefaultType = {
     toggle : 'boolean',
-    parent : 'string'
+    parent : '(string|element)'
   }
 
   const Event = {
@@ -289,7 +289,18 @@ const Collapse = (() => {
     }
 
     _getParent() {
-      const parent   = $(this._config.parent)[0]
+      let parent = null
+      if (Util.isElement(this._config.parent)) {
+        parent = this._config.parent
+
+        // it's a jQuery object
+        if (typeof this._config.parent.jquery !== 'undefined') {
+          parent = this._config.parent[0]
+        }
+      } else {
+        parent = $(this._config.parent)[0]
+      }
+
       const selector =
         `[data-toggle="collapse"][data-parent="${this._config.parent}"]`
 
diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index f76f84ef0..6681df668 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -80,7 +80,7 @@ const Dropdown = (() => {
   }
 
   const DefaultType = {
-    offset      : '(number|string)',
+    offset      : '(number|string|function)',
     flip        : 'boolean'
   }
 
@@ -246,12 +246,19 @@ const Dropdown = (() => {
     }
 
     _getPopperConfig() {
+      const offsetConf = {}
+      if (typeof this._config.offset === 'function') {
+        offsetConf.fn = (data) => {
+          data.offsets = $.extend({}, data.offsets, this._config.offset(data.offsets) || {})
+          return data
+        }
+      } else {
+        offsetConf.offset = this._config.offset
+      }
       const popperConfig = {
         placement : this._getPlacement(),
         modifiers : {
-          offset : {
-            offset : this._config.offset
-          },
+          offset : offsetConf,
           flip : {
             enabled : this._config.flip
           }
diff --git a/js/src/scrollspy.js b/js/src/scrollspy.js
index 70067c0b3..e8f0d3101 100644
--- a/js/src/scrollspy.js
+++ b/js/src/scrollspy.js
@@ -54,6 +54,7 @@ const ScrollSpy = (() => {
     ACTIVE          : '.active',
     NAV_LIST_GROUP  : '.nav, .list-group',
     NAV_LINKS       : '.nav-link',
+    NAV_ITEMS       : '.nav-item',
     LIST_ITEMS      : '.list-group-item',
     DROPDOWN        : '.dropdown',
     DROPDOWN_ITEMS  : '.dropdown-item',
@@ -264,6 +265,8 @@ const ScrollSpy = (() => {
         // Set triggered links parents as active
         // With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor
         $link.parents(Selector.NAV_LIST_GROUP).prev(`${Selector.NAV_LINKS}, ${Selector.LIST_ITEMS}`).addClass(ClassName.ACTIVE)
+        // Handle special case when .nav-link is inside .nav-item
+        $link.parents(Selector.NAV_LIST_GROUP).prev(Selector.NAV_ITEMS).children(Selector.NAV_LINKS).addClass(ClassName.ACTIVE)
       }
 
       $(this._scrollElement).trigger(Event.ACTIVATE, {
diff --git a/js/src/tab.js b/js/src/tab.js
index 18af4e7e2..2a554c287 100644
--- a/js/src/tab.js
+++ b/js/src/tab.js
@@ -196,11 +196,15 @@ const Tab = (() => {
           $(dropdownChild).removeClass(ClassName.ACTIVE)
         }
 
-        active.setAttribute('aria-expanded', false)
+        if (active.getAttribute('role') === 'tab') {
+          active.setAttribute('aria-selected', false)
+        }
       }
 
       $(element).addClass(ClassName.ACTIVE)
-      element.setAttribute('aria-expanded', true)
+      if (element.getAttribute('role') === 'tab') {
+        element.setAttribute('aria-selected', true)
+      }
 
       if (isTransitioning) {
         Util.reflow(element)
diff --git a/js/src/util.js b/js/src/util.js
index b18d0f776..7eb25de55 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -32,10 +32,6 @@ const Util = (() => {
     return {}.toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
   }
 
-  function isElement(obj) {
-    return (obj[0] || obj).nodeType
-  }
-
   function getSpecialTransitionEndEvent() {
     return {
       bindType: transition.end,
@@ -138,12 +134,16 @@ const Util = (() => {
       return Boolean(transition)
     },
 
+    isElement(obj) {
+      return (obj[0] || obj).nodeType
+    },
+
     typeCheckConfig(componentName, config, configTypes) {
       for (const property in configTypes) {
         if (Object.prototype.hasOwnProperty.call(configTypes, property)) {
           const expectedTypes = configTypes[property]
           const value         = config[property]
-          const valueType     = value && isElement(value) ?
+          const valueType     = value && Util.isElement(value) ?
                                 'element' : toType(value)
 
           if (!new RegExp(expectedTypes).test(valueType)) {