How to trigger different functions on hash change based on hash value with jQuery?

Question

I'm using Ben Alman's jQuery hashChange event plugin. the hash part looks like this:

#x=1&y=2&z=3

I already have functions that parse it getHashPart(key) and setHashPart(key).

I would like to have a function that would allow to register with the change of only a specific part of the hash. I would use it as such (I guess...):

$(window).hashchange('x',function(new_value_of_x) {do something x related;});
$(window).hashchange('y',function(new_value_of_y) {do something y related;});

How would I register such a function with jQuery? anything similar exists?

Thanks!

Answer 1

You can have a function that responds to all hashchange events (preferably keeping the hashchange plugin in use), then redirect to individual handlers like this:

var hashParameters = {};

$(window).bind("hashchange",function(event) {
//if you're using the awesome hashchange plugin
//$(window).hashchange(function(event) { ...
    var newParameters = getParameters(event.target.location.hash.substring(1));
    $.each(newParameters, function(key, value) {
       if(hashParameters[key] !== value) $(window).trigger(key + "-change");
       hashParameters[key] = value;
    });
});

$(window).bind("andsome-change", function() {
    alert("hi!");
});

function getParameters(paramString) {
    //taken from http://stackoverflow.com/questions/4197591/parsing-url-hash-fragment-identifier-with-javascript/4198132#4198132
    var params = {};
    var e, a = /\+/g, r = /([^&;=]+)=?([^&;]*)/g,
        d = function (s) { return decodeURIComponent(s.replace(a, " ")); };
    while (e = r.exec(paramString))
       params[d(e[1])] = d(e[2]);
    return params;
}

window.location.hash = "some=value&andsome=othervalue";

I have a working demo here (now with hashchange plugin, see first comment).