From b16127fc105f159ebd06b02df2853941b2aba67c Mon Sep 17 00:00:00 2001
From: Johann-S <johann.servoire@gmail.com>
Date: Thu, 30 Nov 2017 10:54:27 +0100
Subject: [PATCH] Allow Tooltips/Popovers to work in shadow DOM

---
 js/src/tooltip.js                    |  3 ++-
 js/src/util.js                       | 23 +++++++++++++++++
 js/tests/unit/util.js                | 38 ++++++++++++++++++++++++++++
 js/tests/visual/tooltip.html         | 22 +++++++++++++++-
 site/docs/4.1/components/popovers.md |  1 +
 site/docs/4.1/components/tooltips.md |  1 +
 6 files changed, 86 insertions(+), 2 deletions(-)

diff --git a/js/src/tooltip.js b/js/src/tooltip.js
index 1c40dfed34..9fa53a71b4 100644
--- a/js/src/tooltip.js
+++ b/js/src/tooltip.js
@@ -244,8 +244,9 @@ class Tooltip {
     if (this.isWithContent() && this._isEnabled) {
       $(this.element).trigger(showEvent)
 
+      const shadowRoot = Util.findShadowRoot(this.element)
       const isInTheDom = $.contains(
-        this.element.ownerDocument.documentElement,
+        shadowRoot !== null ? shadowRoot : this.element.ownerDocument.documentElement,
         this.element
       )
 
diff --git a/js/src/util.js b/js/src/util.js
index e9665d24fd..1d804cf9da 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -142,6 +142,29 @@ const Util = {
         }
       }
     }
+  },
+
+  findShadowRoot(element) {
+    if (!document.documentElement.attachShadow) {
+      return null
+    }
+
+    // Can find the shadow root otherwise it'll return the document
+    if (typeof element.getRootNode === 'function') {
+      const root = element.getRootNode()
+      return root instanceof ShadowRoot ? root : null
+    }
+
+    if (element instanceof ShadowRoot) {
+      return element
+    }
+
+    // when we don't find a shadow root
+    if (!element.parentNode) {
+      return null
+    }
+
+    return Util.findShadowRoot(element.parentNode)
   }
 }
 
diff --git a/js/tests/unit/util.js b/js/tests/unit/util.js
index 61727304d4..2fd6f6b7cb 100644
--- a/js/tests/unit/util.js
+++ b/js/tests/unit/util.js
@@ -124,4 +124,42 @@ $(function () {
     assert.expect(1)
     assert.ok(Util.supportsTransitionEnd())
   })
+
+  QUnit.test('Util.findShadowRoot should find the shadow DOM root', function (assert) {
+    // Only for newer browsers
+    if (!document.documentElement.attachShadow) {
+      assert.expect(0)
+      return
+    }
+
+    assert.expect(2)
+    var $div = $('<div id="test"></div>').appendTo($('#qunit-fixture'))
+    var shadowRoot = $div[0].attachShadow({
+      mode: 'open'
+    })
+    console.warn($div[0].attachShadow, shadowRoot)
+
+    assert.equal(shadowRoot, Util.findShadowRoot(shadowRoot))
+    shadowRoot.innerHTML = '<button>Shadow Button</button>'
+    assert.equal(shadowRoot, Util.findShadowRoot(shadowRoot.firstChild))
+  })
+
+  QUnit.test('Util.findShadowRoot should return null when attachShadow is not available', function (assert) {
+    assert.expect(1)
+
+    var $div = $('<div id="test"></div>').appendTo($('#qunit-fixture'))
+    if (!document.documentElement.attachShadow) {
+      assert.equal(null, Util.findShadowRoot($div[0]))
+    } else {
+      var sandbox = sinon.createSandbox()
+
+      sandbox.replace(document.documentElement, 'attachShadow', function () {
+        // to avoid empty function
+        return $div
+      })
+
+      assert.equal(null, Util.findShadowRoot($div[0]))
+      sandbox.restore()
+    }
+  })
 })
diff --git a/js/tests/visual/tooltip.html b/js/tests/visual/tooltip.html
index 436f5c1cd8..831f26d0a7 100644
--- a/js/tests/visual/tooltip.html
+++ b/js/tests/visual/tooltip.html
@@ -62,7 +62,12 @@
           </button>
         </p>
       </div>
-      <div id="target" title="Test tooltip on transformed element"></div>
+      <div class="row">
+        <div class="col-sm-3">
+          <div id="target" title="Test tooltip on transformed element"></div>
+        </div>
+        <div id="shadow" class="pt-5"></div>
+      </div>
       <div id="customContainer"></div>
     </div>
 
@@ -72,6 +77,21 @@
     <script src="../../dist/tooltip.js"></script>
     <script>
       $(function () {
+        if (typeof document.body.attachShadow === 'function') {
+          var shadowRoot = $('#shadow')[0].attachShadow({ mode: 'open' })
+          shadowRoot.innerHTML =
+            '<button type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="top" title="Tooltip on top in a shadow dom">' +
+            '  Tooltip on top in a shadow dom' +
+            '</button>' +
+            '<button id="secondTooltip" type="button" class="btn btn-secondary" data-toggle="tooltip" data-placement="top" title="Tooltip on top in a shadow dom with container option">' +
+            '  Tooltip on top in a shadow dom' +
+            '</button>'
+
+          $(shadowRoot.firstChild).tooltip()
+          $(shadowRoot.getElementById('secondTooltip')).tooltip({
+            container: shadowRoot
+          })
+        }
         $('[data-toggle="tooltip"]').tooltip()
         $('#tooltipElement').tooltip({
           container: $('#customContainer')[0]
diff --git a/site/docs/4.1/components/popovers.md b/site/docs/4.1/components/popovers.md
index f55826d7ca..1d407a9014 100644
--- a/site/docs/4.1/components/popovers.md
+++ b/site/docs/4.1/components/popovers.md
@@ -20,6 +20,7 @@ Things to know when using the popover plugin:
 - Popovers for `.disabled` or `disabled` elements must be triggered on a wrapper element.
 - When triggered from anchors that wrap across multiple lines, popovers will be centered between the anchors' overall width. Use `.text-nowrap` on your `<a>`s to avoid this behavior.
 - Popovers must be hidden before their corresponding elements have been removed from the DOM.
+- Popovers can be triggered thanks to an element inside a shadow DOM.
 
 {% include callout-info-prefersreducedmotion.md %}
 
diff --git a/site/docs/4.1/components/tooltips.md b/site/docs/4.1/components/tooltips.md
index aa3ebe077c..e49db56347 100644
--- a/site/docs/4.1/components/tooltips.md
+++ b/site/docs/4.1/components/tooltips.md
@@ -19,6 +19,7 @@ Things to know when using the tooltip plugin:
 - Tooltips for `.disabled` or `disabled` elements must be triggered on a wrapper element.
 - When triggered from hyperlinks that span multiple lines, tooltips will be centered. Use `white-space: nowrap;` on your `<a>`s to avoid this behavior.
 - Tooltips must be hidden before their corresponding elements have been removed from the DOM.
+- Tooltips can be triggered thanks to an element inside a shadow DOM.
 
 {% include callout-info-prefersreducedmotion.md %}