Twitter Share Callback not working in IE (Internet Explorer)

widgetsjs

#1
<script>
function reward_user( event ) {
if ( event ) {
alert("success");
}
}

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', reward_user);
}); 
</script>

<a href="https://twitter.com/intent/tweet?url=abc.com/feed/&text=" " class="sc-twitter" ><i class="icon-twitter-sign icon-white"></i> Share with Twitter</a>

#2

What version of IE are you using here?


#3