bug #19038 Fix feature detection for IE (Alsciende)

stof · stof · commit 7438617400c1 · 2016-06-13T13:03:02.000+02:00
This PR was submitted for the master branch but it was merged into the 2.7 branch instead (closes #19038). Discussion ---------- Fix feature detection for IE | Q | A | ------------- | --- | Branch? | 2.7 | Bug fix? | yes | New feature? | no | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | | License | MIT | Doc PR | operator `!` has higher precedence (4) than operator `in` (8). Parentheses are mandatory here to have a chance at passing the test. Commits ------- b35658b Fix feature detection for IE
diff --git a/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig b/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig
@@ -209,7 +209,7 @@
         var addEventListener;
 
         var el = document.createElement('div');
-        if (!'addEventListener' in el) {
+        if (!('addEventListener' in el)) {
             addEventListener = function (element, eventName, callback) {
                 element.attachEvent('on' + eventName, callback);
             };
