Add dropright and dropleft (right and left placements for our dropdown) (#23860)

* Add dropright (right placement for our dropdown)

* Add dropleft

* moves drop left arrow to the left

2 files changed, 60 insertions, 2 deletions

diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index 18b051b89..45d061c93 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -55,6 +55,8 @@ const Dropdown = (($) => {
     DISABLED  : 'disabled',
     SHOW      : 'show',
     DROPUP    : 'dropup',
+    DROPRIGHT : 'dropright',
+    DROPLEFT  : 'dropleft',
     MENURIGHT : 'dropdown-menu-right',
     MENULEFT  : 'dropdown-menu-left'
   }
@@ -71,7 +73,11 @@ const Dropdown = (($) => {
     TOP       : 'top-start',
     TOPEND    : 'top-end',
     BOTTOM    : 'bottom-start',
-    BOTTOMEND : 'bottom-end'
+    BOTTOMEND : 'bottom-end',
+    RIGHT     : 'right-start',
+    RIGHTEND  : 'right-end',
+    LEFT      : 'left-start',
+    LEFTEND   : 'left-end'
   }
 
   const Default = {
@@ -227,7 +233,7 @@ const Dropdown = (($) => {
 
     _getPlacement() {
       const $parentDropdown = $(this._element).parent()
-      let placement = AttachmentMap.BOTTOM
+      let placement         = AttachmentMap.BOTTOM
 
       // Handle dropup
       if ($parentDropdown.hasClass(ClassName.DROPUP)) {
@@ -235,6 +241,10 @@ const Dropdown = (($) => {
         if ($(this._menu).hasClass(ClassName.MENURIGHT)) {
           placement = AttachmentMap.TOPEND
         }
+      } else if ($parentDropdown.hasClass(ClassName.DROPRIGHT)) {
+        placement = AttachmentMap.RIGHT
+      } else if ($parentDropdown.hasClass(ClassName.DROPLEFT)) {
+        placement = AttachmentMap.LEFT
       } else if ($(this._menu).hasClass(ClassName.MENURIGHT)) {
         placement = AttachmentMap.BOTTOMEND
       }
diff --git a/js/tests/visual/dropdown.html b/js/tests/visual/dropdown.html
index 11b89b0f2..b2e588677 100644
--- a/js/tests/visual/dropdown.html
+++ b/js/tests/visual/dropdown.html
@@ -93,6 +93,7 @@
             </div>
           </div>
         </div>
+
         <div class="col-sm-12 mt-4">
           <div class="btn-group dropup" role="group">
             <a href="#" class="btn btn-secondary">Dropup split align right</a>
@@ -114,8 +115,55 @@
             </div>
           </div>
         </div>
+
+        <div class="col-sm-12 mt-4">
+          <div class="btn-group dropright" role="group">
+            <a href="#" class="btn btn-secondary">Dropright split</a>
+            <button type="button" id="dropdown-page-subheader-button-4" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+              <span class="sr-only">Product actions</span>
+            </button>
+            <div class="dropdown-menu">
+              <button class="dropdown-item" type="button">Action</button>
+              <button class="dropdown-item" type="button">Another action</button>
+              <button class="dropdown-item" type="button">Something else here with a long text</button>
+            </div>
+          </div>
+          <div class="btn-group dropright">
+            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuRight" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+              Dropright
+            </button>
+            <div class="dropdown-menu" aria-labelledby="dropdownMenuRight">
+              <button class="dropdown-item" type="button">Action</button>
+              <button class="dropdown-item" type="button">Another action</button>
+              <button class="dropdown-item" type="button">Something else here</button>
+            </div>
+          </div>
+          <!-- dropleft -->
+          <div class="btn-group dropleft" role="group">
+            <a href="#" class="btn btn-secondary">Dropleft split</a>
+            <button type="button" id="dropdown-page-subheader-button-5" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+              <span class="sr-only">Product actions</span>
+            </button>
+            <div class="dropdown-menu">
+              <button class="dropdown-item" type="button">Action</button>
+              <button class="dropdown-item" type="button">Another action</button>
+              <button class="dropdown-item" type="button">Something else here with a long text</button>
+            </div>
+          </div>
+          <div class="btn-group dropleft">
+            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropleftMenu" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+              Dropleft
+            </button>
+            <div class="dropdown-menu" aria-labelledby="dropleftMenu">
+              <button class="dropdown-item" type="button">Action</button>
+              <button class="dropdown-item" type="button">Another action</button>
+              <button class="dropdown-item" type="button">Something else here</button>
+            </div>
+          </div>
         </div>
+
       </div>
+    </div>
 
     <script src="../../../assets/js/vendor/jquery-slim.min.js"></script>
     <script src="../../../assets/js/vendor/popper.min.js"></script>