From 126437076ca25a5aba3c53112b76e92e48368ca3 Mon Sep 17 00:00:00 2001
From: Timo Tijhof <ttijhof@wikimedia.org>
Date: Fri, 22 Jun 2012 22:16:18 +0200
Subject: [PATCH] (bug 36310) jquery.byteLimit should skip < 0 due to Firefox
 bug.

* Firefox returns -1 if an element has no maxLength property set.
  (instead of undefined). This is especially problematic because
  roundtripping that value (e.g. setting elem.maxLength = -1;)
  causes a DOMException to be thrown.
  That exception is expected (and happens also in Chrome), but Chrome
  and other standard browsers don't return -1 for the getter, so it
  would never end up in the setter.

* Moved the check to before the property set/removal. Otherwise
  the exception would still be thrown. This should've been before
  anyway.

* This fixes:
  - (bug 36310) Can't enter a log summary on Special:MovePage
  in Firefox.

  Even though we do set maxLength for that field from PHP. Recently
  the input field was changed from <input> to <textarea>. And since
  English Wikipedia has wgHtml5 disabled and maxLength on <textarea>
  is new in HTML5, that property was stripped by the Html class, and
  the javascript incorrectly assumed  that the property would be there
  and thus caused the DOMException in Firefox.

* Added unit test for this (which fails in Firefox without this fix).

Change-Id: I28490b61bd5a20dd1d84c4730615514d3822aa77
---
 resources/jquery/jquery.byteLimit.js                 | 12 +++++++-----
 .../suites/resources/jquery/jquery.byteLimit.test.js | 10 ++++++++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/resources/jquery/jquery.byteLimit.js b/resources/jquery/jquery.byteLimit.js
index 45df39a1bd..d8f4bfc50e 100644
--- a/resources/jquery/jquery.byteLimit.js
+++ b/resources/jquery/jquery.byteLimit.js
@@ -41,6 +41,13 @@
 			// that affects the next each() iteration as well.
 			elLimit = limit === undefined ? $el.prop( 'maxLength' ) : limit;
 	
+			// If there is no (valid) limit passed or found in the property,
+			// skip this. The < 0 check is required for Firefox, which returns
+			// -1  (instead of undefined) for maxLength if it is not set.
+			if ( !elLimit || elLimit < 0 ) {
+				return;
+			}
+
 			// Update/set attribute value, but only if there is no callback set.
 			// If there's a callback set, it's possible that the limit being enforced
 			// is too low (ie. if the callback would return "Foo" for "User:Foo").
@@ -53,11 +60,6 @@
 				$el.removeProp( 'maxLength' );
 			}
 	
-			// Nothing passed and/or empty attribute, return without binding an event.
-			if ( elLimit === undefined ) {
-				return;
-			}
-	
 			// Save function for reference
 			$el.data( 'byteLimit-callback', fn );
 	
diff --git a/tests/qunit/suites/resources/jquery/jquery.byteLimit.test.js b/tests/qunit/suites/resources/jquery/jquery.byteLimit.test.js
index 21effdb6d1..2cb94d1b94 100644
--- a/tests/qunit/suites/resources/jquery/jquery.byteLimit.test.js
+++ b/tests/qunit/suites/resources/jquery/jquery.byteLimit.test.js
@@ -106,6 +106,16 @@
 		expected: simpleSample
 	});
 
+	byteLimitTest({
+		description: 'Plain text input. Calling byteLimit with no parameters and no maxLength property (bug 36310)',
+		$input: $( '<input>' )
+			.attr( 'type', 'text' )
+			.byteLimit(),
+		sample: simpleSample,
+		hasLimit: false,
+		expected: simpleSample
+	});
+
 	byteLimitTest({
 		description: 'Limit using the maxlength attribute',
 		$input: $( '<input>' )
-- 
2.20.1