diff --git a/docs/assets/bootstrap.zip b/docs/assets/bootstrap.zip
index 8ad9a0695f..594fb24db8 100644
Binary files a/docs/assets/bootstrap.zip and b/docs/assets/bootstrap.zip differ
diff --git a/docs/assets/js/bootstrap-alert.js b/docs/assets/js/bootstrap-alert.js
index d17f44e150..7a1607da15 100644
--- a/docs/assets/js/bootstrap-alert.js
+++ b/docs/assets/js/bootstrap-alert.js
@@ -45,15 +45,16 @@
       }
 
       $parent = $(selector)
-      $parent.trigger('close')
 
       e && e.preventDefault()
 
       $parent.length || ($parent = $this.hasClass('alert') ? $this : $this.parent())
 
-      $parent
-        .trigger('close')
-        .removeClass('in')
+      $parent.trigger(e = $.Event('close'))
+
+      if (e.isDefaultPrevented()) return
+
+      $parent.removeClass('in')
 
       function removeElement() {
         $parent
diff --git a/docs/assets/js/bootstrap-carousel.js b/docs/assets/js/bootstrap-carousel.js
index 7db5bea333..8ce7418d22 100644
--- a/docs/assets/js/bootstrap-carousel.js
+++ b/docs/assets/js/bootstrap-carousel.js
@@ -86,6 +86,7 @@
         , direction = type == 'next' ? 'left' : 'right'
         , fallback  = type == 'next' ? 'first' : 'last'
         , that = this
+        , e = $.Event('slide')
 
       this.sliding = true
 
@@ -96,11 +97,12 @@
       if ($next.hasClass('active')) return
 
       if ($.support.transition && this.$element.hasClass('slide')) {
+        this.$element.trigger(e)
+        if (e.isDefaultPrevented()) return
         $next.addClass(type)
         $next[0].offsetWidth // force reflow
         $active.addClass(direction)
         $next.addClass(direction)
-        this.$element.trigger('slide')
         this.$element.one($.support.transition.end, function () {
           $next.removeClass([type, direction].join(' ')).addClass('active')
           $active.removeClass(['active', direction].join(' '))
@@ -108,7 +110,8 @@
           setTimeout(function () { that.$element.trigger('slid') }, 0)
         })
       } else {
-        this.$element.trigger('slide')
+        this.$element.trigger(e)
+        if (e.isDefaultPrevented()) return
         $active.removeClass('active')
         $next.addClass('active')
         this.sliding = false
diff --git a/docs/assets/js/bootstrap-collapse.js b/docs/assets/js/bootstrap-collapse.js
index 16b91eb244..478eea3912 100644
--- a/docs/assets/js/bootstrap-collapse.js
+++ b/docs/assets/js/bootstrap-collapse.js
@@ -61,7 +61,7 @@
       }
 
       this.$element[dimension](0)
-      this.transition('addClass', 'show', 'shown')
+      this.transition('addClass', $.Event('show'), 'shown')
       this.$element[dimension](this.$element[0][scroll])
     }
 
@@ -70,7 +70,7 @@
       if (this.transitioning) return
       dimension = this.dimension()
       this.reset(this.$element[dimension]())
-      this.transition('removeClass', 'hide', 'hidden')
+      this.transition('removeClass', $.Event('hide'), 'hidden')
       this.$element[dimension](0)
     }
 
@@ -95,11 +95,13 @@
             that.$element.trigger(completeEvent)
           }
 
+      this.$element.trigger(startEvent)
+
+      if (startEvent.isDefaultPrevented()) return
+
       this.transitioning = 1
 
-      this.$element
-        .trigger(startEvent)
-        [method]('in')
+      this.$element[method]('in')
 
       $.support.transition && this.$element.hasClass('collapse') ?
         this.$element.one($.support.transition.end, complete) :
diff --git a/docs/assets/js/bootstrap-scrollspy.js b/docs/assets/js/bootstrap-scrollspy.js
index bd3f106044..c02e263b0e 100644
--- a/docs/assets/js/bootstrap-scrollspy.js
+++ b/docs/assets/js/bootstrap-scrollspy.js
@@ -46,8 +46,8 @@
         var self = this
           , $targets
 
-        this.offsets = []
-        this.targets = []
+        this.offsets = $([])
+        this.targets = $([])
 
         $targets = this.$body
           .find(this.selector)
diff --git a/docs/assets/js/bootstrap-tab.js b/docs/assets/js/bootstrap-tab.js
index b3938f6714..974cc0aca2 100644
--- a/docs/assets/js/bootstrap-tab.js
+++ b/docs/assets/js/bootstrap-tab.js
@@ -39,6 +39,7 @@
         , selector = $this.attr('data-target')
         , previous
         , $target
+        , e
 
       if (!selector) {
         selector = $this.attr('href')
@@ -49,11 +50,14 @@
 
       previous = $ul.find('.active a').last()[0]
 
-      $this.trigger({
-        type: 'show'
-      , relatedTarget: previous
+      e = $.Event('show', {
+        relatedTarget: previous
       })
 
+      $this.trigger(e)
+
+      if (e.isDefaultPrevented()) return
+
       $target = $(selector)
 
       this.activate($this.parent('li'), $ul)
diff --git a/js/bootstrap-alert.js b/js/bootstrap-alert.js
index d17f44e150..7a1607da15 100644
--- a/js/bootstrap-alert.js
+++ b/js/bootstrap-alert.js
@@ -45,15 +45,16 @@
       }
 
       $parent = $(selector)
-      $parent.trigger('close')
 
       e && e.preventDefault()
 
       $parent.length || ($parent = $this.hasClass('alert') ? $this : $this.parent())
 
-      $parent
-        .trigger('close')
-        .removeClass('in')
+      $parent.trigger(e = $.Event('close'))
+
+      if (e.isDefaultPrevented()) return
+
+      $parent.removeClass('in')
 
       function removeElement() {
         $parent
diff --git a/js/bootstrap-carousel.js b/js/bootstrap-carousel.js
index 7db5bea333..8ce7418d22 100644
--- a/js/bootstrap-carousel.js
+++ b/js/bootstrap-carousel.js
@@ -86,6 +86,7 @@
         , direction = type == 'next' ? 'left' : 'right'
         , fallback  = type == 'next' ? 'first' : 'last'
         , that = this
+        , e = $.Event('slide')
 
       this.sliding = true
 
@@ -96,11 +97,12 @@
       if ($next.hasClass('active')) return
 
       if ($.support.transition && this.$element.hasClass('slide')) {
+        this.$element.trigger(e)
+        if (e.isDefaultPrevented()) return
         $next.addClass(type)
         $next[0].offsetWidth // force reflow
         $active.addClass(direction)
         $next.addClass(direction)
-        this.$element.trigger('slide')
         this.$element.one($.support.transition.end, function () {
           $next.removeClass([type, direction].join(' ')).addClass('active')
           $active.removeClass(['active', direction].join(' '))
@@ -108,7 +110,8 @@
           setTimeout(function () { that.$element.trigger('slid') }, 0)
         })
       } else {
-        this.$element.trigger('slide')
+        this.$element.trigger(e)
+        if (e.isDefaultPrevented()) return
         $active.removeClass('active')
         $next.addClass('active')
         this.sliding = false
diff --git a/js/bootstrap-collapse.js b/js/bootstrap-collapse.js
index 16b91eb244..478eea3912 100644
--- a/js/bootstrap-collapse.js
+++ b/js/bootstrap-collapse.js
@@ -61,7 +61,7 @@
       }
 
       this.$element[dimension](0)
-      this.transition('addClass', 'show', 'shown')
+      this.transition('addClass', $.Event('show'), 'shown')
       this.$element[dimension](this.$element[0][scroll])
     }
 
@@ -70,7 +70,7 @@
       if (this.transitioning) return
       dimension = this.dimension()
       this.reset(this.$element[dimension]())
-      this.transition('removeClass', 'hide', 'hidden')
+      this.transition('removeClass', $.Event('hide'), 'hidden')
       this.$element[dimension](0)
     }
 
@@ -95,11 +95,13 @@
             that.$element.trigger(completeEvent)
           }
 
+      this.$element.trigger(startEvent)
+
+      if (startEvent.isDefaultPrevented()) return
+
       this.transitioning = 1
 
-      this.$element
-        .trigger(startEvent)
-        [method]('in')
+      this.$element[method]('in')
 
       $.support.transition && this.$element.hasClass('collapse') ?
         this.$element.one($.support.transition.end, complete) :
diff --git a/js/bootstrap-scrollspy.js b/js/bootstrap-scrollspy.js
index bd3f106044..c02e263b0e 100644
--- a/js/bootstrap-scrollspy.js
+++ b/js/bootstrap-scrollspy.js
@@ -46,8 +46,8 @@
         var self = this
           , $targets
 
-        this.offsets = []
-        this.targets = []
+        this.offsets = $([])
+        this.targets = $([])
 
         $targets = this.$body
           .find(this.selector)
diff --git a/js/bootstrap-tab.js b/js/bootstrap-tab.js
index b3938f6714..974cc0aca2 100644
--- a/js/bootstrap-tab.js
+++ b/js/bootstrap-tab.js
@@ -39,6 +39,7 @@
         , selector = $this.attr('data-target')
         , previous
         , $target
+        , e
 
       if (!selector) {
         selector = $this.attr('href')
@@ -49,11 +50,14 @@
 
       previous = $ul.find('.active a').last()[0]
 
-      $this.trigger({
-        type: 'show'
-      , relatedTarget: previous
+      e = $.Event('show', {
+        relatedTarget: previous
       })
 
+      $this.trigger(e)
+
+      if (e.isDefaultPrevented()) return
+
       $target = $(selector)
 
       this.activate($this.parent('li'), $ul)
diff --git a/js/tests/index.html b/js/tests/index.html
index 2d59ab0321..3e6cb9777c 100644
--- a/js/tests/index.html
+++ b/js/tests/index.html
@@ -15,6 +15,7 @@
   <script src="../../js/bootstrap-transition.js"></script>
   <script src="../../js/bootstrap-alert.js"></script>
   <script src="../../js/bootstrap-button.js"></script>
+  <script src="../../js/bootstrap-carousel.js"></script>
   <script src="../../js/bootstrap-collapse.js"></script>
   <script src="../../js/bootstrap-dropdown.js"></script>
   <script src="../../js/bootstrap-modal.js"></script>
@@ -28,6 +29,7 @@
   <script src="unit/bootstrap-transition.js"></script>
   <script src="unit/bootstrap-alert.js"></script>
   <script src="unit/bootstrap-button.js"></script>
+  <script src="unit/bootstrap-carousel.js"></script>
   <script src="unit/bootstrap-collapse.js"></script>
   <script src="unit/bootstrap-dropdown.js"></script>
   <script src="unit/bootstrap-modal.js"></script>
diff --git a/js/tests/unit/bootstrap-alert.js b/js/tests/unit/bootstrap-alert.js
index e607f43402..7f24e0e6be 100644
--- a/js/tests/unit/bootstrap-alert.js
+++ b/js/tests/unit/bootstrap-alert.js
@@ -38,4 +38,19 @@ $(function () {
         ok(!$('#qunit-fixture').find('.alert-message').length, 'element removed from dom')
       })
 
+      test("should not fire closed when close is prevented", function () {
+        $.support.transition = false
+        stop();
+        $('<div class="alert"/>')
+          .bind('close', function (e) {
+            e.preventDefault();
+            ok(true);
+            start();
+          })
+          .bind('closed', function () {
+            ok(false);
+          })
+          .alert('close')
+      })
+
 })
\ No newline at end of file
diff --git a/js/tests/unit/bootstrap-carousel.js b/js/tests/unit/bootstrap-carousel.js
new file mode 100644
index 0000000000..92c23e227c
--- /dev/null
+++ b/js/tests/unit/bootstrap-carousel.js
@@ -0,0 +1,28 @@
+$(function () {
+
+    module("bootstrap-carousel")
+
+      test("should be defined on jquery object", function () {
+        ok($(document.body).carousel, 'carousel method is defined')
+      })
+
+      test("should return element", function () {
+        ok($(document.body).carousel()[0] == document.body, 'document.body returned')
+      })
+
+      test("should not fire sliden when slide is prevented", function () {
+        $.support.transition = false
+        stop();
+        $('<div class="carousel"/>')
+          .bind('slide', function (e) {
+            e.preventDefault();
+            ok(true);
+            start();
+          })
+          .bind('slid', function () {
+            ok(false);
+          })
+          .carousel('next')
+      })
+
+})
\ No newline at end of file
diff --git a/js/tests/unit/bootstrap-collapse.js b/js/tests/unit/bootstrap-collapse.js
index 698238d96b..8e52898b5d 100644
--- a/js/tests/unit/bootstrap-collapse.js
+++ b/js/tests/unit/bootstrap-collapse.js
@@ -22,4 +22,19 @@ $(function () {
         ok(/height/.test(el.attr('style')), 'has height set')
       })
 
+      test("should not fire shown when show is prevented", function () {
+        $.support.transition = false
+        stop();
+        $('<div class="collapse"/>')
+          .bind('show', function (e) {
+            e.preventDefault();
+            ok(true);
+            start();
+          })
+          .bind('shown', function () {
+            ok(false);
+          })
+          .collapse('show')
+      })
+
 })
\ No newline at end of file
diff --git a/js/tests/unit/bootstrap-tab.js b/js/tests/unit/bootstrap-tab.js
index 18f490fa5e..9878047810 100644
--- a/js/tests/unit/bootstrap-tab.js
+++ b/js/tests/unit/bootstrap-tab.js
@@ -42,4 +42,20 @@ $(function () {
         equals($("#qunit-fixture").find('.active').attr('id'), "home")
       })
 
+
+      test("should not fire closed when close is prevented", function () {
+        $.support.transition = false
+        stop();
+        $('<div class="tab"/>')
+          .bind('show', function (e) {
+            e.preventDefault();
+            ok(true);
+            start();
+          })
+          .bind('shown', function () {
+            ok(false);
+          })
+          .tab('show')
+      })
+
 })
\ No newline at end of file