Javascript streaming file download

There are multiple ways available to download a file in JavaScript. You can either use the anchor's download attribute or programmatically create an object URL in JavaScript.

The download attribute was added to the anchor element in HTML 5. It informs the browser to download the requested URL instead of navigating to it. You can also specify an optional value for the download attribute to be used as a file name once it is downloaded. If the value is not provided, the original filename is used. As you can see above, the download attribute is the easiest way to download a file on the browser.

However, the download attribute only works in modern browsers. Internet Explorer does not support it. Better approach to download file in JavaScript. Maxim Kachurovskiy. Also seems that you need to modify headers on server side. Nuvvu devudu samee…..

Just opens another tab in latest Chrome…. It works now. Used error on my part. Nice code. Thanks, fixed. Adam Simms. Thank you so much for this! Downloading file is working fine. Tags 3d alternativa android application build C canvas compilation css deploy development experiments eye flash flashdance flashjs game gpu acceleration gradle html html5 image installation interactive internet connection javascript java script js labs mask mobile offline applications online onlinejs optimization performance png projection react social three.

Web performance workshop. Designed by Wpshower. Note: In order to consume a stream using FetchEvent. The custom stream constructor has a start method that uses a setInterval call to generate a random string every second. When the button is pressed, the interval is cancelled, and a function called readStream is invoked to read the data back out of the stream again. In the readStream function itself, we lock a reader to the stream using ReadableStream.

As we said before, any previously enqueued chunks will still be read, but no more can be enqueued because it is closed. If you wanted to completely get rid of the stream and discard any enqueued chunks, you'd use ReadableStream. Sometimes you might want to read a stream twice, simultaneously.

This is achieved via the ReadableStream. You might do this for example in a ServiceWorker if you want to fetch a response from the server and stream it to the browser, but also stream it to the Service Worker cache.

We provide an example of this in our Simple tee example see it live also. This example works much the same way as our Simple random stream, except that when the button is pressed to stop generating random strings, the custom stream is taken and teed, and both resulting streams are then read:. One very experimental feature of streams is the ability to pipe streams into one another called a pipe chain.

This involves two methods — ReadableStream. This functionality is at a very experimental stage and is subject to change, so we have no explored it too deeply as of yet. We have created an example called Unpack Chunks of a PNG see it live also that fetches an image as a stream, then pipes it through to a custom PNG transform stream that retrieves PNG chunks out of a binary data stream.