Strophe.js MUC: creating a room and joining more than one room

Question

I'm creating a chat website and I'm using Strophe.js and the Strophe.muc.js plugin. The single chat functionalities work fine, but I also wan't to implement a group chat function where users can create rooms and invite other users to their room. Using the muc plugin, I can create a room, but the problem is that until I don't configure it (I guess), other users can't join and the room isn't persistent. I know that the muc plugin has configuration methods, but I don't know how to create the config Form object, I have no idea how should it look. This would be my first problem. Second: Is it possible that I join more then one room and get messages from all the rooms I'm in? If not, then there's no need to give me an answer to my first question...

Answer 1

After trying Mark S' solution, I found I have to send presence first for creating the room. I list the whole code below and hope this helps.

//before executing the code below, you need to connect to IM server (var conn is Strophe.Connection)
var userName = "steve",
    serverName = "example.com",
    userJid = userName + '@' + serverName,
    roomJid = 'testRoom' + '@conference.' + serverName,
    iq;

//send presence first for creating room
var d = $pres({'from': userJid, 'to': roomJid + '/' + userName})
conn.send(d.tree());

iq = $iq({
    to: roomJid,
    type: 'set'
}).c("query", {
    xmlns: Strophe.NS.MUC_OWNER
});
iq.c("x", {
    xmlns: "jabber:x:data",
    type: "submit"
});

//send configuration you want
iq.c('field', { 'var': 'FORM_TYPE' }).c('value').t('http://jabber.org/protocol/muc#roomconfig').up().up();
iq.c('field', { 'var': 'muc#roomconfig_publicroom' }).c('value').t('1').up().up();

conn.sendIQ(iq.tree(), function () { console.log('success'); }, function (err) { console.log('error', err); });

I found if I don't send any configuration, the Instant Message server which is openfire only writes the room to cache, not database, so the room will disappear after restarting Instant Message server.