Async.js + imboclient.js

gistfile1.js

var imbo = new Imbo.Client('host', 'pub', 'priv');
var fileInput = document.querySelector('input[type=file]');

fileInput.addEventListener('change', uploadFiles, false);

function uploadFiles() {
    async.mapSeries(
        fileInput.files,
        imbo.addImage.bind(imbo),
        onFilesUploaded
    );
};

function onFilesUploaded(err, imageIdentifiers) {
    if (err) {
        return console.error('Failed to upload images!', err);
    }
    
    console.log(imageIdentifiers.map(imbo.getImageUrl.bind(imbo)));
}