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Fixes #12518, removes an offsetWidth on focus/blur events for an <IE9…

… bug that caused a performance hit. Closes gh-958
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Merrifield, Jay authored and mikesherov committed Oct 15, 2012
1 parent a7a8aad commit 408e5e08c23dda11e6e7a7f8dc44c9e6fcbe870d
Showing with 7 additions and 3 deletions.
  1. +7 −3 src/event.js
@@ -327,8 +327,7 @@ jQuery.event = {
// Call a native DOM method on the target with the same name name as the event.
// Can't use an .isFunction() check here because IE6/7 fails that test.
// Don't do default actions on window, that's where global variables be (#6170)
// IE<9 dies on focus/blur to hidden element (#1486)
if ( ontype && elem[ type ] && ((type !== "focus" && type !== "blur") || event.target.offsetWidth !== 0) && !jQuery.isWindow( elem ) ) {
if ( ontype && elem[ type ] && !jQuery.isWindow( elem ) ) {

// Don't re-trigger an onFOO event when we call its FOO() method
old = elem[ ontype ];
@@ -339,7 +338,12 @@ jQuery.event = {

// Prevent re-triggering of the same event, since we already bubbled it above
jQuery.event.triggered = type;
elem[ type ]();
try {
elem[ type ]();
} catch ( e ) {
// IE<9 dies on focus/blur to hidden element (#1486,#12518)
// only reproducible on winXP IE8 native, not IE9 in IE8 mode
}
jQuery.event.triggered = undefined;

if ( old ) {

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