Perché lo script postMessage non funziona in IE8?

Question

Dopo una lunga ricerca sembra che questo dovrebbe funzionare, ma in IE8 la funzione di permesso non viene mai chiamata ... alcun aiuto?

<script type="text/javascript"> 
    function resizeCrossDomainIframe() {   

     if (window.addEventListener) { 
      window.addEventListener('message', letsgo, false); 
     } else if (window.attachEvent) { 
      window.attachEvent('onmessage', letsgo); 
     } 
    } 
    function letsgo(event) { 
     var iframe = document.getElementById('my_iframe'); 
     if (event.origin !== 'http://mysite.com') return; // only accept messages from the specified domain 
     if (isNaN(event.data)) return; // only accept something which can be parsed as a number 
     var height = parseInt(event.data) + 32; // add some extra height to avoid scrollbar 
     iframe.height = height + "px"; 
    } 
</script> 
    <iframe src='http://mysite.com/products/default.aspx?iframe=true&partnerid=222&site=localhost:62014' frameborder="0" width="100%" scrolling="auto" style="min-height: 750px; min-width: 600px; background-color: #fff;" id="my_iframe" onload="resizeCrossDomainIframe();"> 
    </iframe> 

Answer 1

Ho capito, deve essere stato una condizione di gara. Ho eliminato il carico.

<script type="text/javascript"> 


     if (window.addEventListener) { 
      window.addEventListener('message', letsgo, false); 
     } else if (window.attachEvent) { 
      window.attachEvent('onmessage', letsgo); 
     } 

    function letsgo(event) { 
     var iframe = document.getElementById('my_iframe'); 
     if (event.origin !== 'http://mysite.com') return; // only accept messages from the specified domain 
     if (isNaN(event.data)) return; // only accept something which can be parsed as a number 
     var height = parseInt(event.data) + 32; // add some extra height to avoid scrollbar 
     iframe.height = height + "px"; 
    } 
</script> 
    <iframe src='http://mysite.com/products/default.aspx?iframe=true&partnerid=222&site=localhost:62014' frameborder="0" width="100%" scrolling="auto" style="min-height: 750px; min-width: 600px; background-color: #fff;" id="my_iframe" > 
    </iframe>