Is this an optimal way to prevent the IE8 security banner from appearing when the user downloads a file?

I set the src attribute of an iframe to a download url and then I use appendChild to add the iframe to the body of the page to trigger the download. If the url of the download is fully qualified, ie "" then the download will trigger the security bar. If the url is "http://example/download/" the download goes through without the security bar.

Could someone explain how and why this is happening? I understand that IE8 throws the security bar up when the page tries to download a file from a url that is different than the page url, but I wouldn't think it would be this picky. Also, the current page url is fully qualified so I would think the results I'm getting would be reversed.

Is it a good solution to just chop out a portion of the full domain in order to avoid the security banner?


The easiest way to avoid the security warning is by opening the download URL in a new window instead of an <iframe>.

For example:

<a href='//' onclick='init_download(this.href);return false' target='_blank'>Test</a>
function init_download(link) {, '_blank', 'toolbar=0,location=no,directories=0,status=0,scrollbars=0,resizeable=0,width=1,height=1,top=0,left=0');

View this example at JS Bin

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