Question

17

javascript creating a file from URL

rated 0 times [ 24] [ 7] / answers: 1 / hits: 20168 / 8 Years ago, fri, february 5, 2016, 12:00:00

I'm using a 3rd party library which wants to load in a file via the HTML file system, as in:

<input id=fileupload type=file onchange=LoadAndDisplayFile(this.files[0])>

This works great, except I'd like to pass in a url to a file stored on the serverr rather than have the user upload a file.

I tried using:

var myFile = new File (path/to/file);

with the hope that I'd then be able to pass myFile into LoadAndDisplayFile()
but I get the following error:

Uncaught TypeError: Failed to construct 'File': 2 arguments required, but only 1 present.

I'm sure this is a noob question, but what am I missing here?

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pranavrorys

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1 Year ago

answered 8 Years ago byrondonavanc · Accepted Answer

You cannot create a File object only giving an URL to it.

The right method is to get the file through a Http request and read it, with something like this:

var blob = null

var xhr = new XMLHttpRequest()

xhr.open(GET, path/to/file)

xhr.responseType = blob

xhr.onload = function() 

{

    blob = xhr.response

    LoadAndDisplayFile(blob)

}

xhr.send()