下载二进制文件，而不会触发onb​​eforeunload的 [英] Download binary without triggering onbeforeunload

问题描述

我想揭开序幕文件下载，当他点击一个链接一个用户，但我有一个 onbeforeunload的处理程序，我不希望被调用时，开始下载。要下载，我现在有一个＆LT; A＆GT; 与的href 设置为文件位置，但点击它导致 onbeforeunload的在Chrome中被调用（而不是在FF，虽然）。

I want to kick off a file download for a user when he clicks a link, but I have an onbeforeunload handler that I don't want to get invoked when the download begins. To downloads, I currently have an <a> with the href set to the file location but clicking it results in onbeforeunload being invoked in Chrome (not in FF, though).

我知道我可以设置一个专用标志，并检查了 onbeforeunload的的处理程序，但有一些方法使用AJAX揭开序幕下载？我还是希望用户看到常用的对话框时，下载文件（打开/保存等）。

I know I can set a private flag and check that in the onbeforeunload handler, but is there some way to kick off the download using ajax? I still want the user to see the usual dialogs when they download the file (Open/Save etc).

想法？

推荐答案

要做到这一点确实是通过构建一个iframe，并从那里触发下载的最好方法。

The best way to do this is indeed by constructing an iframe and triggering the download from there.

我在Chrome，IE6 +和Firefox已经测试而这种做法似乎所有的人一起工作。

I have tested in Chrome, IE6+ and Firefox and this approach seems to work in all of them.

例如code：

function DownloadFile(filePath) {
    var downloadIframe = $('<iframe />', 
        {
            id    :    'downloadIframe'        
        }).appendTo('body');
    downloadIframe.attr('src',filePath');
}

这将只存储在一个更广泛的访问变正常了一次性的下载（因为我们已经很难codeD的ID），如果你是触发多次下载，那么我建议你重新使用的iframe

This will only work properly for a one off download (as we've hard coded an id), if you are triggering multiple downloads, then I suggest you reuse the iframe by storing it in a more widely accessible variable.

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