Remove .dropdown-menu[style] reset and adjust .dropdown-menu-* modifiers

- Removes the &[style] selector that was used for resetting Popper styles
- Separate Popper-based alignment from static alignment with `data-bs-popover` attribute that separates the --bs-position and custom right/left properties

Co-Authored-By: Rohit Sharma <[email protected]>

2 files changed, 72 insertions, 3 deletions

diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index a35f55479..378668a6d 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -156,7 +156,9 @@ class Dropdown extends BaseComponent {
     }
 
     // Totally disable Popper for Dropdowns in Navbar
-    if (!this._inNavbar) {
+    if (this._inNavbar) {
+      Manipulator.setDataAttribute(this._menu, 'popper', 'none')
+    } else {
       if (typeof Popper === 'undefined') {
         throw new TypeError('Bootstrap\'s dropdowns require Popper (https://popper.js.org)')
       }
@@ -176,7 +178,14 @@ class Dropdown extends BaseComponent {
         referenceElement = this._config.reference
       }
 
-      this._popper = Popper.createPopper(referenceElement, this._menu, this._getPopperConfig())
+      const popperConfig = this._getPopperConfig()
+      const isDisplayStatic = popperConfig.modifiers.find(modifier => modifier.name === 'applyStyles' && modifier.enabled === false)
+
+      if (isDisplayStatic) {
+        Manipulator.setDataAttribute(this._menu, 'popper', 'static')
+      }
+
+      this._popper = Popper.createPopper(referenceElement, this._menu, popperConfig)
     }
 
     // If this is a touch-enabled device we add extra
@@ -218,6 +227,7 @@ class Dropdown extends BaseComponent {
 
     this._menu.classList.toggle(CLASS_NAME_SHOW)
     this._element.classList.toggle(CLASS_NAME_SHOW)
+    Manipulator.removeDataAttribute(this._menu, 'popper')
     EventHandler.trigger(this._element, EVENT_HIDDEN, relatedTarget)
   }
 
@@ -421,6 +431,7 @@ class Dropdown extends BaseComponent {
 
       dropdownMenu.classList.remove(CLASS_NAME_SHOW)
       toggles[i].classList.remove(CLASS_NAME_SHOW)
+      Manipulator.removeDataAttribute(dropdownMenu, 'popper')
       EventHandler.trigger(toggles[i], EVENT_HIDDEN, relatedTarget)
     }
   }
diff --git a/js/tests/unit/dropdown.spec.js b/js/tests/unit/dropdown.spec.js
index 47775678f..01d599ceb 100644
--- a/js/tests/unit/dropdown.spec.js
+++ b/js/tests/unit/dropdown.spec.js
@@ -1006,13 +1006,44 @@ describe('Dropdown', () => {
 
       const btnDropdown = fixtureEl.querySelector('[data-bs-toggle="dropdown"]')
       const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
+      const dropdown = new Dropdown(btnDropdown)
 
       btnDropdown.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdown._popper).toBeNull()
         expect(dropdownMenu.getAttribute('style')).toEqual(null, 'no inline style applied by Popper')
         done()
       })
 
-      btnDropdown.click()
+      dropdown.show()
+    })
+
+    it('should manage bs attribute `data-bs-popper`="none" when dropdown is in navbar', done => {
+      fixtureEl.innerHTML = [
+        '<nav class="navbar navbar-expand-md navbar-light bg-light">',
+        '  <div class="dropdown">',
+        '    <button class="btn dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">Dropdown</button>',
+        '    <div class="dropdown-menu">',
+        '      <a class="dropdown-item" href="#">Secondary link</a>',
+        '    </div>',
+        '  </div>',
+        '</nav>'
+      ].join('')
+
+      const btnDropdown = fixtureEl.querySelector('[data-bs-toggle="dropdown"]')
+      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
+      const dropdown = new Dropdown(btnDropdown)
+
+      btnDropdown.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdownMenu.getAttribute('data-bs-popper')).toEqual('none')
+        dropdown.hide()
+      })
+
+      btnDropdown.addEventListener('hidden.bs.dropdown', () => {
+        expect(dropdownMenu.getAttribute('data-bs-popper')).toBeNull()
+        done()
+      })
+
+      dropdown.show()
     })
 
     it('should not use Popper if display set to static', done => {
@@ -1037,6 +1068,33 @@ describe('Dropdown', () => {
       btnDropdown.click()
     })
 
+    it('should manage bs attribute `data-bs-popper`="static" when display set to static', done => {
+      fixtureEl.innerHTML = [
+        '<div class="dropdown">',
+        '  <button class="btn dropdown-toggle" data-bs-toggle="dropdown" data-bs-display="static">Dropdown</button>',
+        '  <div class="dropdown-menu">',
+        '    <a class="dropdown-item" href="#">Secondary link</a>',
+        '  </div>',
+        '</div>'
+      ].join('')
+
+      const btnDropdown = fixtureEl.querySelector('[data-bs-toggle="dropdown"]')
+      const dropdownMenu = fixtureEl.querySelector('.dropdown-menu')
+      const dropdown = new Dropdown(btnDropdown)
+
+      btnDropdown.addEventListener('shown.bs.dropdown', () => {
+        expect(dropdownMenu.getAttribute('data-bs-popper')).toEqual('static')
+        dropdown.hide()
+      })
+
+      btnDropdown.addEventListener('hidden.bs.dropdown', () => {
+        expect(dropdownMenu.getAttribute('data-bs-popper')).toBeNull()
+        done()
+      })
+
+      dropdown.show()
+    })
+
     it('should remove "show" class if tabbing outside of menu', done => {
       fixtureEl.innerHTML = [
         '<div class="dropdown">',