Fix nesting of multiple instances of react-tabs

src/components/Tabs.js

@@ -236,7 +236,7 @@ module.exports = React.createClass({
   },
 
   handleKeyDown(e) {
-    if (isTabNode(e.target)) {
+    if (this.isTabFromContainer(e.target)) {
       let index = this.state.selectedIndex;
       let preventDefault = false;
 
@@ -264,7 +264,7 @@ module.exports = React.createClass({
   handleClick(e) {
     let node = e.target;
     do { // eslint-disable-line no-cond-assign
-      if (isTabNode(node)) {
+      if (this.isTabFromContainer(node)) {
         if (isTabDisabled(node)) {
           return;
         }
@@ -302,6 +302,30 @@ module.exports = React.createClass({
     };
   },
 
+  /**
+   * Determine if a node from event.target is a Tab element for the current Tabs container.
+   * If the clicked element is not a Tab, it returns false.
+   * If it finds another Tabs container between the Tab and `this`, it returns false.
+   */
+  isTabFromContainer(node) {
+    // return immediately if the clicked element is not a Tab.
+    if (!isTabNode(node)) {
+      return false;
+    }
+
+    // Check if the first occurrence of a Tabs container is `this` one.
+    let nodeAncestor = node.parentElement;
+    const tabsNode = findDOMNode(this);
+    do {
+      if (nodeAncestor === tabsNode) return true;
+      else if (nodeAncestor.getAttribute('data-tabs')) break;
+
+      nodeAncestor = nodeAncestor.parentElement;
+    } while (nodeAncestor);
+
+    return false;
+  },
+
   render() {
     // This fixes an issue with focus management.
     //
@@ -331,6 +355,7 @@ module.exports = React.createClass({
         )}
         onClick={this.handleClick}
         onKeyDown={this.handleKeyDown}
+        data-tabs
       >
         {this.getChildren()}
       </div>

src/components/__tests__/Tabs-test.js

@@ -171,7 +171,6 @@ describe('react-tabs', () => {
       expect(wrapper.childAt(2).text()).toBe('Hello Bar');
       expect(wrapper.childAt(3).text()).toBe('');
 
-
       wrapper.childAt(0).childAt(2).simulate('click');
 
       expect(wrapper.childAt(1).text()).toBe('');
@@ -241,5 +240,34 @@ describe('react-tabs', () => {
         </Tabs>
       )).not.toThrow();
     });
+
+    it('should support nested tabs', () => {
+      const wrapper = mount(
+        <Tabs className="first">
+          <TabList>
+            <Tab />
+            <Tab />
+          </TabList>
+          <TabPanel>
+            <Tabs className="second">
+              <TabList>
+                <Tab />
+                <Tab />
+              </TabList>
+              <TabPanel />
+              <TabPanel />
+            </Tabs>
+          </TabPanel>
+          <TabPanel />
+        </Tabs>
+      );
+
+      const innerTabs = wrapper.childAt(1).childAt(0);
+
+      innerTabs.childAt(0).childAt(1).simulate('click');
+
+      assertTabSelected(wrapper, 0);
+      assertTabSelected(innerTabs, 1);
+    });
   });
 });