Custom class names in ReactCSSTransitionGroup

docs/docs/10.1-animation.md

@@ -84,6 +84,36 @@ You'll notice that when you try to remove an item `ReactCSSTransitionGroup` keep
 }
 ```
 
+### Custom Classes ###
+
+It is also possible to use custom class names for each of the steps in your transitions. Instead of passing a string into transitionName you can pass an object containing either the `enter` and `leave` class names, or an object containing the `enter`, `enter-active`, `leave-active`, and `leave` class names. If only the enter and leave classes are provided, the enter-active and leave-active classes will be determined by appending '-active' to the end of the class name. Here are two examples using custom classes:
+
+```javascript
+  ...
+  <ReactCSSTransitionGroup
+    transitionName={
+      enter: 'enter',
+      enterActive: 'enterActive',
+      leave: 'leave',
+      leaveActive: 'leaveActive',
+      appear: 'appear',
+      appearActive: 'appearActive'
+    }>
+    {item}
+  </ReactCSSTransitionGroup>
+
+  <ReactCSSTransitionGroup
+    transitionName={
+      enter: 'enter',
+      leave: 'leave',
+      appear: 'appear'
+    }>
+    {item2}
+  </ReactCSSTransitionGroup>
+  ...
+
+```
+
 ### Animation Group Must Be Mounted To Work
 
 In order for it to apply transitions to its children, the `ReactCSSTransitionGroup` must already be mounted in the DOM. The example below would not work, because the `ReactCSSTransitionGroup` is being mounted along with the new item, instead of the new item being mounted within it. Compare this to the [Getting Started](#getting-started) section above to see the difference.

src/addons/transitions/ReactCSSTransitionGroup.js

@@ -27,7 +27,22 @@ var ReactCSSTransitionGroup = React.createClass({
   displayName: 'ReactCSSTransitionGroup',
 
   propTypes: {
-    transitionName: React.PropTypes.string.isRequired,
+    transitionName: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.shape({
+        enter: React.PropTypes.string,
+        leave: React.PropTypes.string,
+        active: React.PropTypes.string
+      }),
+      React.PropTypes.shape({
+        enter: React.PropTypes.string,
+        enterActive: React.PropTypes.string,
+        leave: React.PropTypes.string,
+        leaveActive: React.PropTypes.string,
+        appear: React.PropTypes.string,
+        appearActive: React.PropTypes.string
+      })
+    ]).isRequired,
     transitionAppear: React.PropTypes.bool,
     transitionEnter: React.PropTypes.bool,
     transitionLeave: React.PropTypes.bool

src/addons/transitions/ReactCSSTransitionGroupChild.js

@@ -48,8 +48,8 @@ var ReactCSSTransitionGroupChild = React.createClass({
 
   transition: function(animationType, finishCallback) {
     var node = React.findDOMNode(this);
-    var className = this.props.name + '-' + animationType;
-    var activeClassName = className + '-active';
+    var className = this.props.name[animationType] || this.props.name + '-' + animationType;
+    var activeClassName = this.props.name[animationType + 'Active'] || className + '-active';
     var noEventTimeout = null;
 
     var endListener = function(e) {