How to detect change of window hash?

Question

How can you detect a window.location.hash onchange, for example I could do this:

if(window.location.hash.hasChanged())
{
   // ajax stuff
}
else         


        

Answer 1

Most recent browsers (FF3.6+, IE8, Chrome) support the "hashchange" event on the window object - see MDC: window.onhashchange for usage examples. Simple asynchronous listening might look like:

window.onhashchange = function() {
   // do something awesome here
};

If you want an implementation that supports older browsers, things get complicated quite quickly, and I recommend using someone else's library or plugin - see answers to this question for several suggestions.