add js support for carousel indicators

docs/assets/js/bootstrap.js

@@ -289,6 +289,7 @@
 
   var Carousel = function (element, options) {
     this.$element = $(element)
+    this.$indicators = this.$element.find('.carousel-indicators')
     this.options = options
     this.options.pause == 'hover' && this.$element
       .on('mouseenter', $.proxy(this.pause, this))
@@ -305,13 +306,17 @@
       return this
     }
 
+  , getActiveIndex: function () {
+      this.$active = this.$element.find('.item.active')
+      this.$items = this.$active.parent().children()
+      return this.$items.index(this.$active)
+    }
+
   , to: function (pos) {
-      var $active = this.$element.find('.item.active')
-        , children = $active.parent().children()
-        , activePos = children.index($active)
+      var activeIndex = this.getActiveIndex()
         , that = this
 
-      if (pos > (children.length - 1) || pos < 0) return
+      if (pos > (this.$items.length - 1) || pos < 0) return
 
       if (this.sliding) {
         return this.$element.one('slid', function () {
@@ -319,11 +324,11 @@
         })
       }
 
-      if (activePos == pos) {
+      if (activeIndex == pos) {
         return this.pause().cycle()
       }
 
-      return this.slide(pos > activePos ? 'next' : 'prev', $(children[pos]))
+      return this.slide(pos > activeIndex ? 'next' : 'prev', $(this.$items[pos]))
     }
 
   , pause: function (e) {
@@ -353,6 +358,7 @@
         , isCycling = this.interval
         , direction = type == 'next' ? 'left' : 'right'
         , fallback  = type == 'next' ? 'first' : 'last'
+        , $nextIndicator
         , that = this
         , e
 
@@ -368,6 +374,14 @@
 
       if ($next.hasClass('active')) return
 
+      if (this.$indicators.length) {
+        this.$indicators.find('.active').removeClass('active')
+        this.$element.one('slid', function () {
+          $nextIndicator = $(that.$indicators.children()[that.getActiveIndex()])
+          $nextIndicator && $nextIndicator.addClass('active')
+        })
+      }
+
       if ($.support.transition && this.$element.hasClass('slide')) {
         this.$element.trigger(e)
         if (e.isDefaultPrevented()) return
@@ -832,8 +846,7 @@
             that.$element.appendTo(document.body) //don't move modals dom position
           }
 
-          that.$element
-            .show()
+          that.$element.show()
 
           if (transition) {
             that.$element[0].offsetWidth // force reflow