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Getting live updates and deletes in ChicagoBoss Tutorial
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| % 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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