[js] Add support for form submit in W3C mode (fixes #9916)

javascript/node/selenium-webdriver/lib/webdriver.js

@@ -2167,7 +2167,7 @@ class TargetLocator {
    * @return {!WebElementPromise} The active element.
    */
   activeElement() {
-    var id = this.driver_.execute(
+    const id = this.driver_.execute(
       new command.Command(command.Name.GET_ACTIVE_ELEMENT)
     )
     return new WebElementPromise(this.driver_, id)
@@ -2259,7 +2259,7 @@ class TargetLocator {
    *     when the driver has changed focus to the new window.
    */
   newWindow(typeHint) {
-    var driver = this.driver_
+    const driver = this.driver_
     return this.driver_
       .execute(
         new command.Command(command.Name.SWITCH_TO_NEW_WINDOW).setParameter(
@@ -2281,10 +2281,10 @@ class TargetLocator {
    * @return {!AlertPromise} The open alert.
    */
   alert() {
-    var text = this.driver_.execute(
+    const text = this.driver_.execute(
       new command.Command(command.Name.GET_ALERT_TEXT)
     )
-    var driver = this.driver_
+    const driver = this.driver_
     return new AlertPromise(
       driver,
       text.then(function (text) {
@@ -2614,7 +2614,7 @@ class WebElement {
    *     requested CSS value.
    */
   getCssValue(cssStyleProperty) {
-    var name = command.Name.GET_ELEMENT_VALUE_OF_CSS_PROPERTY
+    const name = command.Name.GET_ELEMENT_VALUE_OF_CSS_PROPERTY
     return this.execute_(
       new command.Command(name).setParameter('propertyName', cssStyleProperty)
     )
@@ -2758,7 +2758,10 @@ class WebElement {
    *     when the form has been submitted.
    */
   submit() {
-    return this.execute_(new command.Command(command.Name.SUBMIT_ELEMENT))
+    const form = this.findElement({xpath:"./ancestor-or-self::form"});
+    this.driver_.executeScript("var e = arguments[0].ownerDocument.createEvent('Event');"+
+    "e.initEvent('submit', true, true);"+
+    "if (arguments[0].dispatchEvent(e)) { arguments[0].submit() }", form)
   }
 
   /**

javascript/node/selenium-webdriver/test/lib/form_submit_test.js

@@ -0,0 +1,45 @@
+
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+'use strict'
+
+const assert = require('assert')
+const test = require('../../lib/test')
+const until = require('../../lib/until')
+const Pages = test.Pages
+
+test.suite(function (env) {
+  let driver
+
+  before(async function () {
+    driver = await env.builder().build()
+  })
+
+  after(async function () {
+    return await driver.quit()
+  })
+
+  it('should be able to submit form in W3c mode', async function () {
+    await driver.get(Pages.formPage);
+    const form = await driver.findElement({id: 'submitButton'})
+    await form.submit();
+    await driver.wait(until.titleIs('We Arrive Here'), 2500)
+    const success = driver.findElement({id: 'greeting'})
+    assert.deepStrictEqual(await success.getText(), 'Success!');
+  })
+},  { browsers: ['chrome', 'firefox'] })