JavaScript file upload

main.js

$(function () {
    $('#attachment-field').change(function () {
        var file = this.files[0];

        //image file only
        if (file.type.match(/^image\//)) {
            var request = new XMLHttpRequest();
            request.open('POST', '/upload/path');
            request.send(new FormData(document.getElementById('form-xyz')));
        }
    });
});