What measuring unit is used for file sizes in javascript?

Question

am trying to validate file size on the client side before uploading to server. However I think i need to calculate max-size in javascript.

So how do i write 4MB in javascript ? I would also want to know basically in what measuring unit is javascript calculated in terms of file size.

below is my colde:

//Grab the file list
        var files   =   e.target.files;
        $.each(files,function(i,file){

        //check for the correct file extensiton
        var n   = file.name,
            s   = file.size
            t   = file.type;
        if(s > 4MB){

            console.log("File is greater than 4MB");

   }
}

Please help.Thank you.

Answer 1

The file size is measured in bytes - do this:

if (s > 4 * 1024 * 1024)
    alert("Too big");