javascript - 打开隐藏的 iframe 以在文档准备好时下载文件

2022-01-20 00:00:00 iframe popup jquery javascript document-ready

我正在尝试使用此技巧在文档准备就绪时打开文件下载对话框.同样的技巧对我来说又一次奏效了，但那次 iframe 是在 ajax 调用之后添加的.这是片段:

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 ajax call. This is the snippet:

<script type="text/javascript">
  $(document).ready(function() {
     var url='/my_file_url/';
     var _iframe_dl = $('<iframe />')
                       .attr('src', url)
                       .hide()
                       .appendTo('body');
  });
</script>

虽然 iframe 在 html 代码中正确打印，但它没有预期的行为:加载页面后没有出现下载文件弹出窗口.有什么帮助吗?

While the iframe is correctly printed in html code, it doesn’t have the expected behaviour: no download file popup appears after loading the page. Any help on why?

推荐答案

效果很好，假设 MIME 是一种将开始下载的类型，例如 application/octet-stream.由于内置 pdf 阅读器，您可能会遇到浏览器正在呈现它并且不提供下载的问题.

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 = $('<iframe />')
       .attr('src', url)
       .hide()
       .appendTo('body');
});

如果客户端在现代浏览器上，另一种解决方案是使用 <a> 并设置 href 和 download，然后模拟点击它.

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

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);

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