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function onJoined(room) {
    $("#joinBtn").text("Leave").off('click').click(function(){
        $(this).prop('disabled', true);
        room.leave().then(onLeft, onLeft);
    }).prop('disabled', false);
    $('#sendMessageBtn').off('click').click(function(){
        var message = field('message');
        addMessage(connection.username(), message);
        $('#message').val("");
        //broadcast message
        var participants = room.getParticipants();
        for (var i = 0; i < participants.length; i++) {
            participants[i].sendMessage(message);
        }
    }).prop('disabled',false);
    $('#failedInfo').text("");
}