[fixed] Modal won't steal focus from children

fixes #903

src/Modal.js

@@ -101,6 +101,7 @@ const Modal = React.createClass({
     animation: React.PropTypes.bool,
     onRequestHide: React.PropTypes.func.isRequired,
     dialogClassName: React.PropTypes.string,
+    autoFocus: React.PropTypes.bool,
     enforceFocus: React.PropTypes.bool
   },
 
@@ -111,6 +112,8 @@ const Modal = React.createClass({
       keyboard: true,
       animation: true,
       closeButton: true,
+
+      autoFocus: true,
       enforceFocus: true
     };
   },
@@ -205,6 +208,10 @@ const Modal = React.createClass({
     React.findDOMNode(this.refs.backdrop).onclick = function () {};
   },
 
+  componentWillMount(){
+    this.checkForFocus();
+  },
+
   componentDidMount() {
     const doc = domUtils.ownerDocument(this);
     const win = domUtils.ownerWindow(this);
@@ -286,11 +293,23 @@ const Modal = React.createClass({
     this.setState(this._getStyles());
   },
 
+  checkForFocus(){
+    if ( domUtils.canUseDom ) {
+      try {
+        this.lastFocus = document.activeElement;
+      }
+      catch (e) {}
+    }
+  },
+
   focusModalContent () {
-    if (this.props.enforceFocus) {
-      this.lastFocus = domUtils.activeElement(this);
+    let modalContent = React.findDOMNode(this.refs.modal);
+    let current = domUtils.activeElement(this);
+    let focusInModal = current && domUtils.contains(modalContent, current);
+
+    if (this.props.autoFocus && !focusInModal) {
+      this.lastFocus = current;
 
-      let modalContent = React.findDOMNode(this.refs.modal);
       modalContent.focus();
     }
   },

test/ModalSpec.js

@@ -156,7 +156,7 @@ describe('Modal', function () {
       }, 0);
     });
 
-    it('Should not focus on the Modal when enforceFocus is false', function (done) {
+    it('Should not focus on the Modal when autoFocus is false', function (done) {
 
       document.activeElement.should.equal(focusableContainer);
 
@@ -167,7 +167,7 @@ describe('Modal', function () {
         render() {
           if (this.state.modalOpen) {
             return (
-              <Modal enforceFocus={false} onRequestHide={()=>{}} container={this}>
+              <Modal autoFocus={false} onRequestHide={()=>{}} container={this}>
                 <strong>Message</strong>
               </Modal>
             );
@@ -185,6 +185,38 @@ describe('Modal', function () {
         done();
       }, 0);
     });
+
+    it('Should not focus Modal when child has focus', function (done) {
+
+      document.activeElement.should.equal(focusableContainer);
+
+      let Container = React.createClass({
+        getInitialState() {
+          return {modalOpen: true};
+        },
+        render() {
+          if (this.state.modalOpen) {
+            return (
+              <Modal onRequestHide={()=>{}} container={this}>
+                <input autoFocus />
+              </Modal>
+            );
+          } else {
+            return <span/>;
+          }
+        }
+      });
+
+      var instance = React.render(<Container />, focusableContainer);
+
+      setTimeout(function () {
+        let input = React.findDOMNode(
+          ReactTestUtils.findRenderedDOMComponentWithTag(instance, 'input'))
+
+        document.activeElement.should.equal(input);
+        done();
+      }, 0);
+    });
   });