How to convert file to base64 in JavaScript?

Question

Now I\'m getting File object by this line:

file = document.querySelector(\'#files > input[type=\"file\"]\').files[0]

I need to send thi

Answer 1

onInputChange(evt) {
    var tgt = evt.target || window.event.srcElement,
    files = tgt.files;
    if (FileReader && files && files.length) {
        var fr = new FileReader();
        fr.onload = function () {
            var base64 = fr.result;
            debugger;
        }
        fr.readAsDataURL(files[0]);
    }
}