Is there any way to 'simulate' right-click save-as command or force download of file in the browser with JavaScript?_问答_开发者

Is there any way to 'simulate' right-click save-as command or force download of file in the browser with JavaScript?

开发者 https://www.devze.com 2023-01-16 07:24 出处：网络

I have this situation where we have media files stored on a global CDN. Our web app is hosted on it\'s own server and then when the media assets are needed they are called from the CDN url. Recently w

I have this situation where we have media files stored on a global CDN. Our web app is hosted on it's own server and then when the media assets are needed they are called from the CDN url. Recently we had a page where the user can download file attachments, however some of the file types were opening in the browser instead of downloading (such as MP3). The only way around this was to manually specif开发者_运维知识库y the HTTP response to attach the file but the only way I could achieve this was to download the file from CDN to my server and then feed it back to the user, which defeats the purpose of having it on the global CDN. Instead I am wondering if there is some client side solution for this?

EDIT: Just found this somewhere, though I'm not sure if it will work right in all the browsers?

<body>
<script>
function downloadme(x){
myTempWindow = window.open(x,'','left=10000,screenX=10000');
myTempWindow.document.execCommand('SaveAs','null','download.pdf');
myTempWindow.close();
}
</script>

<a href=javascript:downloadme('/test.pdf');>Download this pdf</a>
</body>

RE-EDIT: Oh well, so much for that idea -> Does execCommand SaveAs work in Firefox?

Does your CDN allow you to specify the HTTP headers? Amazon cloudfront does, for example.

I found an easy solution to this that worked for me. Add a URL parameter to the file name. This will trick the browser into bypassing it's built in file mappings. For examaple, instead of http://mydomain.com/file.pdf , set your client side link up to point to http://mydomain.com/file.pdf? (added a question mark)