Twitter callback on tweet

HTML

<a class="twitter-share popup" href="https://twitter.com/intent/tweet?url=http://humbleself.com&via=vonschweinhund&text=Test">Tweet</a>

<a href="https://twitter.com/share" class="twitter-share-button" data-url="http://humbleself.com" data-via="vonschweinhund" data-count="none">Tweet</a>

CSS

a { display: block; margin-bottom: 20px; }

JavaScript

window.twttr = (function(d, s, id) {
    var t, js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s);
    js.id = id;
    js.src = "//platform.twitter.com/widgets.js";
    fjs.parentNode.insertBefore(js, fjs);
    return window.twttr || (t = {
        _e: [],
        ready: function(f) {
            t._e.push(f)
        }
    });
}(document, "script", "twitter-wjs"));

twttr.ready(function(twttr) {
    twttr.events.bind('tweet', function(event) {
    if(event)
    {
    	alert('Tweet');
    }
    });
});