Update all collapse triggers with .collapsed class and aria-expanded

Fixes #15741
Closes #15751 by merging it.

js/collapse.js

@@ -16,7 +16,8 @@
   var Collapse = function (element, options) {
     this.$element      = $(element)
     this.options       = $.extend({}, Collapse.DEFAULTS, options)
-    this.$trigger      = $(this.options.trigger).filter('[href="#' + element.id + '"], [data-target="#' + element.id + '"]')
+    this.$trigger      = $('[data-toggle="collapse"][href="#' + element.id + '"],' +
+                           '[data-toggle="collapse"][data-target="#' + element.id + '"]')
     this.transitioning = null
 
     if (this.options.parent) {
@@ -33,8 +34,7 @@
   Collapse.TRANSITION_DURATION = 350
 
   Collapse.DEFAULTS = {
-    toggle: true,
+    toggle: true
-    trigger: '[data-toggle="collapse"]'
   }
 
   Collapse.prototype.dimension = function () {
@@ -203,7 +203,7 @@
 
     var $target = getTargetFromTrigger($this)
     var data    = $target.data('bs.collapse')
-    var option  = data ? 'toggle' : $.extend({}, $this.data(), { trigger: this })
+    var option  = data ? 'toggle' : $this.data()
 
     Plugin.call($target, option)
   })

js/tests/unit/collapse.js

@@ -80,7 +80,7 @@ $(function () {
     $('<div id="test1"/>')
       .appendTo('#qunit-fixture')
       .on('shown.bs.collapse', function () {
-        assert.ok(!$target.hasClass('collapsed'))
+        assert.ok(!$target.hasClass('collapsed'), 'target does not have collapsed class')
         done()
       })
 
@@ -95,7 +95,41 @@ $(function () {
     $('<div id="test1" class="in"/>')
       .appendTo('#qunit-fixture')
       .on('hidden.bs.collapse', function () {
-        assert.ok($target.hasClass('collapsed'))
+        assert.ok($target.hasClass('collapsed'), 'target has collapsed class')
+        done()
+      })
+
+    $target.click()
+  })
+
+  QUnit.test('should remove "collapsed" class from all triggers targeting the collapse when the collapse is shown', function (assert) {
+    var done = assert.async()
+
+    var $target = $('<a data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
+    var $alt = $('<a data-toggle="collapse" class="collapsed" href="#test1"/>').appendTo('#qunit-fixture')
+
+    $('<div id="test1"/>')
+      .appendTo('#qunit-fixture')
+      .on('shown.bs.collapse', function () {
+        assert.ok(!$target.hasClass('collapsed'), 'target trigger does not have collapsed class')
+        assert.ok(!$alt.hasClass('collapsed'), 'alt trigger does not have collapsed class')
+        done()
+      })
+
+    $target.click()
+  })
+
+  QUnit.test('should add "collapsed" class to all triggers targeting the collapse when the collapse is hidden', function (assert) {
+    var done = assert.async()
+
+    var $target = $('<a data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
+    var $alt = $('<a data-toggle="collapse" href="#test1"/>').appendTo('#qunit-fixture')
+
+    $('<div id="test1" class="in"/>')
+      .appendTo('#qunit-fixture')
+      .on('hidden.bs.collapse', function () {
+        assert.ok($target.hasClass('collapsed'), 'target has collapsed class')
+        assert.ok($alt.hasClass('collapsed'), 'alt trigger has collapsed class')
         done()
       })
 
@@ -230,6 +264,40 @@ $(function () {
     $target.click()
   })
 
+  QUnit.test('should set aria-expanded="true" on all triggers targeting the collapse when the collapse is shown', function (assert) {
+    var done = assert.async()
+
+    var $target = $('<a data-toggle="collapse" class="collapsed" href="#test1" aria-expanded="false"/>').appendTo('#qunit-fixture')
+    var $alt = $('<a data-toggle="collapse" class="collapsed" href="#test1" aria-expanded="false"/>').appendTo('#qunit-fixture')
+
+    $('<div id="test1"/>')
+      .appendTo('#qunit-fixture')
+      .on('shown.bs.collapse', function () {
+        assert.strictEqual($target.attr('aria-expanded'), 'true', 'aria-expanded on target is "true"')
+        assert.strictEqual($alt.attr('aria-expanded'), 'true', 'aria-expanded on alt is "true"')
+        done()
+      })
+
+    $target.click()
+  })
+
+  QUnit.test('should set aria-expanded="false" on all triggers targeting the collapse when the collapse is hidden', function (assert) {
+    var done = assert.async()
+
+    var $target = $('<a data-toggle="collapse" href="#test1" aria-expanded="true"/>').appendTo('#qunit-fixture')
+    var $alt = $('<a data-toggle="collapse" href="#test1" aria-expanded="true"/>').appendTo('#qunit-fixture')
+
+    $('<div id="test1" class="in"/>')
+      .appendTo('#qunit-fixture')
+      .on('hidden.bs.collapse', function () {
+        assert.strictEqual($target.attr('aria-expanded'), 'false', 'aria-expanded on target is "false"')
+        assert.strictEqual($alt.attr('aria-expanded'), 'false', 'aria-expanded on alt is "false"')
+        done()
+      })
+
+    $target.click()
+  })
+
   QUnit.test('should change aria-expanded from active accordion target to "false" and set the newly active one to "true"', function (assert) {
     var done = assert.async()
 
@@ -293,7 +361,7 @@ $(function () {
     $target1.click()
 
     setTimeout(function () {
-      assert.ok(!showFired, 'show event didn\'t fire')
+      assert.ok(!showFired, 'show event did not fire')
       done()
     }, 1)
   })