Convert any file to base64 in javascript

toBase64.js

var toBase64=function (file , callBack) {
    file=file.files[0];
    var reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = function () {
        callBack(file,reader.result);
    };
    reader.onerror = function (error) {
        console.log('Error: ', error);
    };
};


//usage with jquery
var fileEl=$('input[type=file]');
$(fileEl).on('change',function () {
    toBase64(this,function (file,base64) {
        console.log(file);
        console.log(base64);
    });
});