drag and drop jslint error

[tryingtolearn]

Im following some examples for drag and drop file uploads and have come across the same for loop in different tutorials

And get the following error (jslint)

The loop

for (i = 0, f; f = files[i]; i++) {

ParseFile(f);

UploadFile(f);

}

The error

 

Expected a conditional expression and instead saw an assignment

 

 

I tried omitting it and adding a break in the loop but it gave the same error on the break line.

 

Trying to figure out an explanation for the error 

 - or a way to re write the second statement to pass through jslint

 

 

[tryingtolearn]

This seemed to do the trick

Not exactly sure what throws the error above or why its considered an error since both versions work..

// file selection
	function FileSelectHandler(e) {
        var i,
            files,
            f;

		// cancel event and hover styling
		fileDragHover(e);

		// fetch FileList object
		files = e.target.files || e.dataTransfer.files;

		// process all File objects
        for (i = 0; i <= files.length - 1; i = i + 1) {
            f = files[i];
            parseFile(f);
            uploadFile(f);
        }
    }