Catch iframe reload with jQuery

I have an iframe loaded dynamically with jQuery like this

jQuery('<iframe id="myFrame" src="iframesrc.php"></iframe>').load(function(){
    // do stuff when loaded
}).prependTo("#myDiv");

And I want to catch the reload event every time the inner frame is reloaded. I tried this:

jQuery('body').on('load', '#myDiv', function() {
    alert('iframe loaded');
});

But I'm not getting any response, both on the initial load and when following links inside the iframe. What am I doing wrong?