Keep autoFocus attribute in the DOM (#11192)

* Keep autoFocus attribute in the DOM

* Don't emit autoFocus attribute on the client

* Test that hydration doesn't call focus

* Add autoFocus to SSR fixture

fixtures/ssr/src/components/Page.js

@@ -2,6 +2,11 @@ import React, {Component} from 'react';
 
 import './Page.css';
 
+const autofocusedInputs = [
+  <input key="0" autoFocus placeholder="Has auto focus" />,
+  <input key="1" autoFocus placeholder="Has auto focus" />,
+];
+
 export default class Page extends Component {
   state = {active: false};
   handleClick = e => {
@@ -18,9 +23,16 @@ export default class Page extends Component {
         <p suppressHydrationWarning={true}>
           A random number: {Math.random()}
         </p>
+        <p>
+          Autofocus on page load: {autofocusedInputs}
+        </p>
         <p>
           {!this.state.active ? link : 'Thanks!'}
         </p>
+        {this.state.active &&
+          <p>
+            Autofocus on update: {autofocusedInputs}
+          </p>}
       </div>
     );
   }

src/renderers/dom/fiber/ReactDOMFiberComponent.js

@@ -54,6 +54,7 @@ var registrationNameModules = EventPluginRegistry.registrationNameModules;
 var DANGEROUSLY_SET_INNER_HTML = 'dangerouslySetInnerHTML';
 var SUPPRESS_CONTENT_EDITABLE_WARNING = 'suppressContentEditableWarning';
 var SUPPRESS_HYDRATION_WARNING = 'suppressHydrationWarning';
+var AUTOFOCUS = 'autoFocus';
 var CHILDREN = 'children';
 var STYLE = 'style';
 var HTML = '__html';
@@ -286,6 +287,9 @@ function setInitialDOMProperties(
       propKey === SUPPRESS_HYDRATION_WARNING
     ) {
       // Noop
+    } else if (propKey === AUTOFOCUS) {
+      // We polyfill it separately on the client during commit.
+      // We blacklist it here rather than in the property list because we emit it in SSR.
     } else if (registrationNameModules.hasOwnProperty(propKey)) {
       if (nextProp != null) {
         if (__DEV__ && typeof nextProp !== 'function') {
@@ -681,6 +685,8 @@ var ReactDOMFiberComponent = {
         propKey === SUPPRESS_HYDRATION_WARNING
       ) {
         // Noop
+      } else if (propKey === AUTOFOCUS) {
+        // Noop. It doesn't work on updates anyway.
       } else if (registrationNameModules.hasOwnProperty(propKey)) {
         // This is a special case. If any listener updates we need to ensure
         // that the "current" fiber pointer gets updated so we need a commit

src/renderers/dom/shared/DOMProperty.js

@@ -16,7 +16,6 @@ var invariant = require('fbjs/lib/invariant');
 var RESERVED_PROPS = {
   children: true,
   dangerouslySetInnerHTML: true,
-  autoFocus: true,
   defaultValue: true,
   defaultChecked: true,
   innerHTML: true,

src/renderers/dom/shared/HTMLDOMPropertyConfig.js

@@ -26,6 +26,7 @@ var HTMLDOMPropertyConfig = {
   // name warnings.
   Properties: {
     allowFullScreen: HAS_BOOLEAN_VALUE,
+    autoFocus: HAS_STRING_BOOLEAN_VALUE,
     // specifies target context for links with `preload` type
     async: HAS_BOOLEAN_VALUE,
     // autoFocus is polyfilled/normalized by AutoFocusUtils

src/renderers/dom/shared/__tests__/ReactServerRendering-test.js

@@ -351,6 +351,26 @@ describe('ReactDOMServer', () => {
       expect(numClicks).toEqual(2);
     });
 
+    // We have a polyfill for autoFocus on the client, but we intentionally don't
+    // want it to call focus() when hydrating because this can mess up existing
+    // focus before the JS has loaded.
+    it('should emit autofocus on the server but not focus() when hydrating', () => {
+      var element = document.createElement('div');
+      element.innerHTML = ReactDOMServer.renderToString(
+        <input autoFocus={true} />,
+      );
+      expect(element.firstChild.autofocus).toBe(true);
+
+      // It should not be called on mount.
+      element.firstChild.focus = jest.fn();
+      ReactDOM.hydrate(<input autoFocus={true} />, element);
+      expect(element.firstChild.focus).not.toHaveBeenCalled();
+
+      // Or during an update.
+      ReactDOM.render(<input autoFocus={true} />, element);
+      expect(element.firstChild.focus).not.toHaveBeenCalled();
+    });
+
     it('should throw with silly args', () => {
       expect(
         ReactDOMServer.renderToString.bind(ReactDOMServer, {x: 123}),