[added] Accessibility: use appropriate ARIA's when an id is given to …

…the tabbed area

src/TabPane.js

@@ -78,7 +78,11 @@ const TabPane = React.createClass({
     };
 
     return (
-      <div {...this.props} className={classNames(this.props.className, classes)}>
+      <div {...this.props}
+        role='tabpanel'
+        aria-hidden={!this.props.active}
+        className={classNames(this.props.className, classes)}
+      >
         {this.props.children}
       </div>
     );

src/TabbedArea.js

@@ -5,6 +5,9 @@ import ValidComponentChildren from './utils/ValidComponentChildren';
 import Nav from './Nav';
 import NavItem from './NavItem';
 
+let panelId = (props, child) => child.props.id ? child.props.id : props.id && (props.id + '___panel___' + child.props.eventKey);
+let tabId = (props, child) => child.props.id ? child.props.id + '___tab' : props.id && (props.id + '___tab___' + child.props.eventKey);
+
 function getDefaultActiveKeyFromChildren(children) {
   let defaultActiveKey;
 
@@ -61,6 +64,8 @@ const TabbedArea = React.createClass({
   },
 
   render() {
+    let { id, ...props } = this.props; // eslint-disable-line object-shorthand
+
     let activeKey =
       this.props.activeKey != null ? this.props.activeKey : this.state.activeKey;
 
@@ -69,15 +74,15 @@ const TabbedArea = React.createClass({
     }
 
     let nav = (
-      <Nav {...this.props} activeKey={activeKey} onSelect={this.handleSelect} ref="tabs">
+      <Nav {...props} activeKey={activeKey} onSelect={this.handleSelect} ref="tabs">
         {ValidComponentChildren.map(this.props.children, renderTabIfSet, this)}
       </Nav>
     );
 
     return (
       <div>
         {nav}
-        <div id={this.props.id} className="tab-content" ref="panes">
+        <div id={id} className="tab-content" ref="panes">
           {ValidComponentChildren.map(this.props.children, this.renderPane)}
         </div>
       </div>
@@ -91,11 +96,15 @@ const TabbedArea = React.createClass({
   renderPane(child, index) {
     let activeKey = this.getActiveKey();
 
+    let active = (child.props.eventKey === activeKey &&
+            (this.state.previousActiveKey == null || !this.props.animation));
+
     return cloneElement(
         child,
         {
-          active: (child.props.eventKey === activeKey &&
-            (this.state.previousActiveKey == null || !this.props.animation)),
+          active,
+          id: panelId(this.props, child),
+          'aria-labelledby': tabId(this.props, child),
           key: child.key ? child.key : index,
           animation: this.props.animation,
           onAnimateOutEnd: (this.state.previousActiveKey != null &&
@@ -106,9 +115,12 @@ const TabbedArea = React.createClass({
 
   renderTab(child) {
     let {eventKey, className, tab, disabled } = child.props;
+
     return (
       <NavItem
+        linkId={tabId(this.props, child)}
         ref={'tab' + eventKey}
+        aria-controls={panelId(this.props, child)}
         eventKey={eventKey}
         className={className}
         disabled={disabled}>

test/TabPaneSpec.js

@@ -16,4 +16,23 @@ describe('TabPane', function () {
     );
     assert.ok(ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'active'));
   });
+
+  describe('Web Accessibility', function(){
+
+    it('Should have aria-hidden', function () {
+      let instance = ReactTestUtils.renderIntoDocument(
+        <TabPane active>Item content</TabPane>
+      );
+
+      assert.equal(React.findDOMNode(instance).getAttribute('aria-hidden'), 'false');
+    });
+
+    it('Should have role', function () {
+      let instance = ReactTestUtils.renderIntoDocument(
+        <TabPane active>Item content</TabPane>
+      );
+
+      assert.equal(React.findDOMNode(instance).getAttribute('role'), 'tabpanel');
+    });
+  });
 });

test/TabbedAreaSpec.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import ReactTestUtils from 'react/lib/ReactTestUtils';
 import TabbedArea from '../src/TabbedArea';
+import NavItem from '../src/NavItem';
 import TabPane from '../src/TabPane';
 import ValidComponentChildren from '../src/utils/ValidComponentChildren';
 
@@ -229,5 +230,49 @@ describe('TabbedArea', function () {
     assert.equal(tabbedArea.refs.tabs.props.activeKey, 2);
   });
 
+  describe('Web Accessibility', function(){
 
+    it('Should generate ids from parent id', function () {
+      let instance = ReactTestUtils.renderIntoDocument(
+        <TabbedArea defaultActiveKey={2} id='tabs'>
+          <TabPane tab="Tab 1" eventKey={1}>Tab 1 content</TabPane>
+          <TabPane tab="Tab 2" eventKey={2}>Tab 2 content</TabPane>
+        </TabbedArea>
+      );
+
+      let tabs = ReactTestUtils.scryRenderedComponentsWithType(instance, NavItem);
+
+      tabs.every(tab =>
+        assert.ok(tab.props['aria-controls'] && tab.props.linkId));
+    });
+
+    it('Should add aria-controls', function () {
+      let instance = ReactTestUtils.renderIntoDocument(
+        <TabbedArea defaultActiveKey={2} id='tabs'>
+          <TabPane id='pane-1' tab="Tab 1" eventKey={1}>Tab 1 content</TabPane>
+          <TabPane id='pane-2' tab="Tab 2" eventKey={2}>Tab 2 content</TabPane>
+        </TabbedArea>
+      );
+
+      let panes = ReactTestUtils.scryRenderedComponentsWithType(instance, TabPane);
+
+      assert.equal(panes[0].props['aria-labelledby'], 'pane-1___tab');
+      assert.equal(panes[1].props['aria-labelledby'], 'pane-2___tab');
+    });
+
+    it('Should add aria-controls', function () {
+      let instance = ReactTestUtils.renderIntoDocument(
+        <TabbedArea defaultActiveKey={2} id='tabs'>
+          <TabPane id='pane-1' tab="Tab 1" eventKey={1}>Tab 1 content</TabPane>
+          <TabPane id='pane-2' tab="Tab 2" eventKey={2}>Tab 2 content</TabPane>
+        </TabbedArea>
+      );
+
+      let tabs = ReactTestUtils.scryRenderedComponentsWithType(instance, NavItem);
+
+      assert.equal(tabs[0].props['aria-controls'], 'pane-1');
+      assert.equal(tabs[1].props['aria-controls'], 'pane-2');
+    });
+
+  });
 });