[RadioGroup] Support uncontrolled mode

packages/material-ui/src/RadioGroup/RadioGroup.js

@@ -9,6 +9,15 @@ import { createChainedFunction, find } from '../utils/helpers';
 class RadioGroup extends React.Component {
   radios = [];
 
+  state = {
+    value: null,
+  };
+
+  constructor(props) {
+    super();
+    this.isControlled = props.value != null;
+  }
+
   focus = () => {
     if (!this.radios || !this.radios.length) {
       return;
@@ -30,15 +39,22 @@ class RadioGroup extends React.Component {
     focusRadios[0].focus();
   };
 
-  handleRadioChange = (event, checked) => {
-    if (checked && this.props.onChange) {
+  handleChange = event => {
+    if (!this.isControlled) {
+      this.setState({
+        value: event.target.value,
+      });
+    }
+
+    if (this.props.onChange) {
       this.props.onChange(event, event.target.value);
     }
   };
 
   render() {
-    const { children, name, value, onChange, ...other } = this.props;
+    const { children, name, value: valueProp, onChange, ...other } = this.props;
 
+    const value = this.isControlled ? valueProp : this.state.value;
     this.radios = [];
 
     return (
@@ -64,7 +80,7 @@ class RadioGroup extends React.Component {
               }
             },
             checked: value === child.props.value,
-            onChange: createChainedFunction(child.props.onChange, this.handleRadioChange),
+            onChange: createChainedFunction(child.props.onChange, this.handleChange),
           });
         })}
       </FormGroup>

packages/material-ui/src/RadioGroup/RadioGroup.test.js

@@ -37,6 +37,25 @@ describe('<RadioGroup />', () => {
     assert.strictEqual(handleKeyDown.args[0][0], event);
   });
 
+  it('should support uncontrolled mode', () => {
+    const wrapper = shallow(
+      <RadioGroup name="group">
+        <Radio value="one" />
+      </RadioGroup>,
+    );
+
+    const radio = wrapper.children().first();
+    const event = { target: { value: 'one' } };
+    radio.simulate('change', event, true);
+    assert.strictEqual(
+      wrapper
+        .children()
+        .first()
+        .props().checked,
+      true,
+    );
+  });
+
   describe('imperative focus()', () => {
     let wrapper;
 
@@ -134,20 +153,6 @@ describe('<RadioGroup />', () => {
       assert.strictEqual(handleChange.calledWith(event), true);
     });
 
-    it('should not fire onChange if not checked', () => {
-      const handleChange = spy();
-      const wrapper = shallow(
-        <RadioGroup value="" onChange={handleChange}>
-          <Radio />
-          <Radio />
-        </RadioGroup>,
-      );
-
-      const internalRadio = wrapper.children().first();
-      internalRadio.simulate('change', { target: { value: 'woofRadioGroup' } }, false);
-      assert.strictEqual(handleChange.callCount, 0);
-    });
-
     it('should chain the onChange property', () => {
       const handleChange1 = spy();
       const handleChange2 = spy();