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ui/webui/resources/js/util.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // <include src="assert.js">
 
 /**
  * Alias for document.getElementById. Found elements must be HTMLElements.
  * @param {string} id The ID of the element to find.
  * @return {HTMLElement} The found element or null if not found.
@@ skipping 375 matching lines @@
 
 /**
  * Quote a string so it can be used in a regular expression.
  * @param {string} str The source string.
  * @return {string} The escaped string.
  */
 function quoteString(str) {
   return str.replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, '\\$1');
 }
 
+/**
+ * Calls |callback| and stops listening the first time any event in |eventNames|
+ * is triggered on |target|.
+ * @param {!EventTarget} target
+ * @param {!Array<string>|string} eventNames Array or space-delimited string of
+ *     event names to listen to (e.g. 'click mousedown').
+ * @param {function(!Event)} callback Called at most once. The
+ *     optional return value is passed on by the listener.
+ */
+function listenOnce(target, eventNames, callback) {
+  if (!Array.isArray(eventNames))
+    eventNames = eventNames.split(/ +/);
+
+  var removeAllAndCallCallback = function(event) {
+    for (var eventName of eventNames)

[Dan Beam, 2016/09/01 03:02:01]

this code runs on iOS, where for..of support may be dodgy (that's why I didn't
use in my example)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/...
http://kangax.github.io/compat-table/es6/#test-for..of_loops

enjoy your fun choices!

[michaelpg, 2016/09/07 00:30:26]

Done.

+      target.removeEventListener(eventName, removeAllAndCallCallback, false);
+    return callback(event);
+  };
+
+  for (var eventName of eventNames)
+    target.addEventListener(eventName, removeAllAndCallCallback, false);
+}
+
 // <if expr="is_ios">
 // Polyfill 'key' in KeyboardEvent for iOS.
 // This function is not intended to be complete but should
 // be sufficient enough to have iOS work correctly while
 // it does not support key yet.
 if (!('key' in KeyboardEvent.prototype)) {
   Object.defineProperty(KeyboardEvent.prototype, 'key', {
     /** @this {KeyboardEvent} */
     get: function () {
       // 0-9
@@ skipping 46 matching lines @@
         case 0xdb: return '[';
         case 0xdd: return ']';
       }
       return 'Unidentified';
     }
   });
 } else {
   window.console.log("KeyboardEvent.Key polyfill not required");
 }
 // </if>  /* is_ios */