[Bug 17125] Add a FileList.drop(index) method

https://www.w3.org/Bugs/Public/show_bug.cgi?id=17125

--- Comment #6 from Max Lohrmann <post@wickenrode.com> 2012-06-26 19:11:08 UTC ---
Well the 
<input type="file" name="something" />

element has always been readonly (you can't change value) for security
purposes.
That makes sense as a string could always be manipulated by JS.

The File object on the other hand should be "safe" in that
- Only the browser can create one on user request (ie. by file input or drag
and drop)
- JS cannot change it in any way

So it should not be a security issue to allow assignment to a file input.
For example:

<input type="file" name="something[]" onchange="splitFiles();" id="in1"
multiple="multiple" />

function splitFiles() {
  var in = document.getElementById('in1');
  //create single inputs
  for(var i=0;i<in.files.length;i++) {
        var newEl = document.createElement('input');
        newEl.name = "something[]";
        newEl.id = '...';
        newEl.type = "file";
        newEl.value = in.files[i]; // <-- assignment of file object
        document.appendChild(newEl); //add for upload
        //create some UI to remove this input
        //...
    }
    //remove the multi-input
    in.parent.removeChild(in);
}

This code would split a multi-file-input back to multiple single-file inputs
(that way applications with a legacy backend that only supports the classical
way could also support multi-file-inputs).

Another use would be with File objects obtained by drag and drop.
Right now those require XHR to upload, allowing to make them a selection of a
file input could simplify some situations as well as provide richer UI (when
showing a traditional file input together with a drop area those could stay in
sync).

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Received on Tuesday, 26 June 2012 19:18:55 UTC