# `connection` is Strophe.Connection
connection.archive.init(connection)

var jid = 'username@your_xmpp_server';
connection.listCollections(jid, null, function(collections, responseRsm) {
    // Now you can iterate over the collections. Here we retrieve
    // all the messages contained in each collection.
    collections.forEach(function(collection) {
        collection.retrieveMessages(function(null, function(messages) {
            // Your callback here to process all the messages in this collection.
        });
    });
});

var cachedResponseRsm = null;
var jid = 'username@your_xmpp_server';
// Retrieve a max of 1 collections.
var rsm = new Strophe.RSM({max: 1});
// Fetch the first collection.
connection.listCollections(jid, rsm, function(firstCollection, firstRsm) {
    // To demonstrate paging, we use the responseRsm to fetch the next collection.
    var nextRsm = firstRsm.next();
    connection.listCollections(jid, nextRsm, function(secondCollection, secondRsm) {
        // Now we have access to the secondCollection here.
    });
});