Any event to detect when the “Class” attribute is

问题:

I have a "div" control with some id="myDiv" class="myClass" var var1=10; in Javascript. Based on user action I will change the class for this control from "myClass" to "newClass" so when this has happened I want to change the value of var1 to 20.

So how would I recognize that change in Class?

回答1:

You may use onpropertychange(IE) and DOMAttrModified (others)

回答2:

You'll have to use 3 things:

1. onpropertychange event, for IE < 9
2. DOMAttrModified, works in IE9, Opera, Firefox, and not regrettably in all others as Dr.Molle suggests
3. Everything else - must resort to setInterval loop, that checks if value changed, this includes webkit browsers (chrome and safari), since they still don't have DOMAttrModified support, so - you'll have to resort to loop check for those browsers.

There is jQuery plugin which implements this (there is also a demo on the page):

http://darcyclarke.me/dev/watch/