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rokob/gist:2466176

Created April 22, 2012 18:56
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Getting live updates and deletes in ChicagoBoss Tutorial
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gistfile1.erl
% src/view/greeting/live.html
<html><head>
<title>Fresh hot greetings!</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
<script>
function listen_for_events(timestamp) {
$.ajax("/greeting/pull/"+timestamp, { success:
function(data, code, xhr) {
for (var i=0; i<data.greetings.length; i++) {
var creaty = data.greetings[i].create;
var delety = data.greetings[i].delete;
if (creaty) {
var msg = creaty.greeting_text;
var msgid = creaty.id;
$("#greeting_list").append('<li id="'+msgid+'">'+msg+'</li>');
}
if (delety) {
var msg = delety.greeting_text;
var msgid = delety.id;
$("#"+msgid).remove();
}
}
listen_for_events(data.timestamp);
},
});
};
$(document).ready(function() {
listen_for_events({{ timestamp }});
});
</script>
</head>
<body>
<ul id="greeting_list">
{% for greeting in greetings %}
<li id="{{ greeting.id }}">{{ greeting.greeting_text }}</li>
{% empty %}
<li>No greetings!</li>
{% endfor %}
</ul>
</body>
</html>
% priv/init/cb_tutorial_01_news.erl
init() ->
{ok, WatchId} = boss_news:watch("greetings",
fun(created, NewGreeting) ->
boss_mq:push("greetings", [{"create", NewGreeting}]);
(deleted, OldGreeting) ->
boss_mq:push("greetings", [{"delete",OldGreeting}])
end),
{ok, [WatchId]}.
% src/controller/cb_tutorial_greeting_controller.erl
pull('GET', [OldTimestamp]) ->
{ok, Timestamp, Greetings} = boss_mq:pull("greetings",
list_to_integer(OldTimestamp)),
{json, [{timestamp, Timestamp}, {greetings, Greetings}]};
live('GET', []) ->
Greetings = boss_db:find(greeting, []),
Timestamp = boss_mq:now("greetings"),
{ok, [{greetings, Greetings}, {timestamp, Timestamp}]}.
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