(function() {
    var logEl = document.getElementById('log');
    function log(m) { var d = document.createElement('div'); d.className='pkg-log-entry'; d.textContent=m; logEl.appendChild(d); logEl.scrollTop=logEl.scrollHeight; }
    new MultipleUpload('#demo', {
        uploadUrl: '/api/upload',
        multiple: true,
        customValidation: function(file) {
            log('Checking ' + file.name + '...');
            return new Promise(function(resolve) {
                setTimeout(function() {
                    if (file.size > 10 * 1024 * 1024) {
                        resolve('File exceeds 10 MB policy limit.');
                    } else {
                        log(file.name + ' passed async check');
                        resolve(null);
                    }
                }, 500);
            });
        },
        onValidationError: function(msg, name) { log((name||'file') + ': ' + msg); }
    });
})();