Added findDOMNode, as we move toward deprecating g

src/browser/__tests__/findDOMNode.-test.js

@@ -0,0 +1,51 @@
+/**
+ * Copyright 2013-2014, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @emails react-core
+ */
+
+"use strict";
+
+var React = require('React');
+var ReactTestUtils = require('ReactTestUtils');
+
+describe('findDOMNode', function() {
+  it('findDOMNode should return null if passed null', function() {
+    expect(React.findDOMNode(null)).toBe(null);
+  });
+
+  it('findDOMNode should find dom element', function() {
+    var MyNode = React.createClass({
+      render: function() {
+        return <div><span>Noise</span></div>;
+      }
+    });
+
+    var myNode = ReactTestUtils.renderIntoDocument(<MyNode />);
+    var myDiv = React.findDOMNode(myNode);
+    var mySameDiv = React.findDOMNode(myDiv);
+    expect(myDiv.tagName).toBe('DIV');
+    expect(mySameDiv).toBe(myDiv);
+  });
+
+  it('findDOMNode should reject random objects', function() {
+    expect(function() {React.findDOMNode({foo: 'bar'});})
+      .toThrow('Invariant Violation: Element appears to be neither ' +
+        'ReactComponent nor DOMNode (keys: foo)'
+      );
+  });
+
+  it('findDOMNode should reject unmounted objects with render func', function() {
+    expect(function() {React.findDOMNode({render: function(){}});})
+      .toThrow('Invariant Violation: Component contains `render` ' +
+        'method but is not mounted in the DOM'
+      );
+  });
+
+});
+

src/browser/findDOMNode.js

@@ -0,0 +1,50 @@
+/**
+ * Copyright 2013-2014, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule findDOMNode
+ * @typechecks static-only
+ */
+
+"use strict";
+
+var ReactComponent = require('ReactComponent');
+var ReactInstanceMap = require('ReactInstanceMap');
+var ReactMount = require('ReactMount');
+
+var invariant = require('invariant');
+var isNode = require('isNode');
+
+/**
+ * Returns the DOM node rendered by this element.
+ *
+ * @param {ReactComponent|DOMElement} element
+ * @return {DOMElement} The root node of this element.
+ */
+function findDOMNode(componentOrElement) {
+  if (componentOrElement == null) {
+    return null;
+  }
+  if (isNode(componentOrElement)) {
+    return componentOrElement;
+  }
+  if (ReactInstanceMap.has(componentOrElement)) {
+    return ReactMount.getNodeFromInstance(componentOrElement);
+  }
+  invariant(
+    !(componentOrElement.render != null && typeof(componentOrElement.render) === 'function'),
+    'Component contains `render` method but is not mounted in the DOM',
+    Object.keys(componentOrElement)
+  );
+  invariant(
+    false,
+    'Element appears to be neither ReactComponent nor DOMNode (keys: %s)',
+    Object.keys(componentOrElement)
+  );
+}
+
+module.exports = findDOMNode;

src/browser/ui/React.js

@@ -35,6 +35,7 @@ var ReactRef = require('ReactRef');
 var ReactServerRendering = require('ReactServerRendering');
 
 var assign = require('Object.assign');
+var findDOMNode = require('findDOMNode');
 var onlyChild = require('onlyChild');
 
 ReactDefaultInjection.inject();
@@ -69,6 +70,7 @@ var React = {
   },
   constructAndRenderComponent: ReactMount.constructAndRenderComponent,
   constructAndRenderComponentByID: ReactMount.constructAndRenderComponentByID,
+  findDOMNode: findDOMNode,
   render: render,
   renderToString: ReactServerRendering.renderToString,
   renderToStaticMarkup: ReactServerRendering.renderToStaticMarkup,

src/browser/ui/ReactBrowserComponentMixin.js

@@ -11,9 +11,7 @@
 
 "use strict";
 
-var ReactMount = require('ReactMount');
-
-var invariant = require('invariant');
+var findDOMNode = require('findDOMNode');
 
 var ReactBrowserComponentMixin = {
   /**
@@ -24,11 +22,7 @@ var ReactBrowserComponentMixin = {
    * @protected
    */
   getDOMNode: function() {
-    invariant(
-      this.isMounted(),
-      'getDOMNode(): A component must be mounted to have a DOM node.'
-    );
-    return ReactMount.getNodeFromInstance(this);
+    return findDOMNode(this);
   }
 };