Detect if the iframe content has loaded successfully

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I found the following link via Google: http://wordpressapi.com/2010/01/28/check-iframes-loaded-completely-browser/

Don’t know if it solves the ‘Page Not Found’ issue.

<script type="javascript">
var iframe = document.createElement("iframe");
iframe.src = "http://www.your_iframe.com/";
if (navigator.userAgent.indexOf("MSIE") > -1 && !window.opera) {
  iframe.onreadystatechange = function(){
    if (iframe.readyState == "complete"){
      alert("Iframe is now loaded.");
    }
  };
} else {
  iframe.onload = function(){
    alert("Iframe is now loaded.");
  };
}
</script>

I haven’t tried it myself, so I don’t know if it works. Good luck!

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