javascript - opening hidden iframe for file download on document ready

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不要未来只要你来 2021-01-16 12:40
I’m trying to use this trick to open a file download dialog on document ready. The same trick has worked another time for me, but that time the iframe was added after an aja
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不思量自难忘° (楼主)
2021-01-16 13:25
It works just fine, assuming that the MIME is of a type that will start a download, for example application/octet-stream. You may be encountering an issue where the browser is rendering it and not offering a download due to an in-built pdf reader.
$(document).ready(function(){
var url='data:application/octet-stream,hello%20world';
var _iframe_dl = $('')
       .attr('src', url)
       .hide()
       .appendTo('body');
});
</code></pre>

<p>An alternate solution, if the client is on a modern browser, is to use an <code><a></code> with <em>href</em> and <em>download</em> set, then simulate a click on it.</p>

<pre><code>var a = document.createElement('a'),
    ev = document.createEvent("MouseEvents");
a.href = url;
a.download = url.slice(url.lastIndexOf('/')+1);
ev.initMouseEvent("click", true, false, self, 0, 0, 0, 0, 0,
                  false, false, false, false, 0, null);
a.dispatchEvent(ev);
</code></pre>
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