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ui/webui/resources/js/util.js

Index: ui/webui/resources/js/util.js
diff --git a/ui/webui/resources/js/util.js b/ui/webui/resources/js/util.js
index 759bfbbf308ac232374ffec3e12436f68882fbee..64243d678369107ab7ce33336ae14a27eaba0c7a 100644
--- a/ui/webui/resources/js/util.js
+++ b/ui/webui/resources/js/util.js
@@ -393,6 +393,29 @@ 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