Detach accordion from card

js/src/collapse.js

@@ -57,7 +57,8 @@ const Collapse = (($) => {
 
   const Selector = {
     ACTIVES     : '.card > .show, .card > .collapsing',
-    DATA_TOGGLE : '[data-toggle="collapse"]'
+    DATA_TOGGLE : '[data-toggle="collapse"]',
+    DATA_CHILDREN : 'data-children'
   }
 
 
@@ -77,13 +78,20 @@ const Collapse = (($) => {
         `[data-toggle="collapse"][href="#${element.id}"],` +
         `[data-toggle="collapse"][data-target="#${element.id}"]`
       ))
-
       this._parent = this._config.parent ? this._getParent() : null
 
       if (!this._config.parent) {
         this._addAriaAndCollapsedClass(this._element, this._triggerArray)
       }
 
+      this._selectorActives = Selector.ACTIVES
+      if (this._parent) {
+        const childrenSelector = this._parent.hasAttribute(Selector.DATA_CHILDREN) ? this._parent.getAttribute(Selector.DATA_CHILDREN) : null
+        if (childrenSelector !== null) {
+          this._selectorActives = `${childrenSelector} > .show, ${childrenSelector} > .collapsing`
+        }
+      }
+
       if (this._config.toggle) {
         this.toggle()
       }
@@ -124,7 +132,7 @@ const Collapse = (($) => {
       let activesData
 
       if (this._parent) {
-        actives = $.makeArray($(this._parent).find(Selector.ACTIVES))
+        actives = $.makeArray($(this._parent).find(this._selectorActives))
         if (!actives.length) {
           actives = null
         }

js/tests/unit/collapse.js

@@ -490,4 +490,27 @@ $(function () {
       .bootstrapCollapse('show')
   })
 
+  QUnit.test('should allow accordion to use children other than card', function (assert) {
+    assert.expect(2)
+    var done = assert.async()
+    var accordionHTML = '<div id="accordion" data-children=".item">'
+        + '<div class="item">'
+        + '<a id="linkTrigger" data-parent="#accordion" data-toggle="collapse" href="#collapseOne" aria-expanded="false" aria-controls="collapseOne"></a>'
+        + '<div id="collapseOne" class="collapse" role="tabpanel" aria-labelledby="headingThree"></div>'
+        + '</div>'
+        + '<div class="item">'
+        + '<a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo"></a>'
+        + '<div id="collapseTwo" class="collapse show" role="tabpanel" aria-labelledby="headingTwo"></div>'
+        + '</div>'
+        + '</div>'
+
+    $(accordionHTML).appendTo('#qunit-fixture')
+    var $target = $('#linkTrigger')
+    $('#collapseOne').on('shown.bs.collapse', function () {
+      assert.ok($(this).hasClass('show'))
+      assert.ok(!$('#collapseTwo').hasClass('show'))
+      done()
+    })
+    $target.trigger($.Event('click'))
+  })
 })