The controller (cb_tutorial_greeting_controller.erl):
-module(cb_tutorial_greeting_controller, [Req]).
-compile(export_all).
hello('GET', []) ->
{ok, [{greeting, "Hello, world!"}]}.
list('GET', []) ->
Greetings = boss_db:find(greeting, []),
{ok, [{greetings, Greetings}]}.
create('GET', []) ->
ok;
create('POST', []) ->
GreetingText = Req:post_param("greeting_text"),
NewGreeting = greeting:new(id, GreetingText),
case NewGreeting:save() of
{ok, SavedGreeting} ->
{redirect, [{action, "list"}]};
{error, ErrorList} ->
{ok, [{errors, ErrorList}, {new_msg, NewGreeting}]}
end.
goodbye('POST', []) ->
boss_db:delete(Req:post_param("greeting_id")),
{redirect, [{action, "list"}]}.
send_test_message('GET', []) ->
TestMessage = "Free at last!",
boss_mq:push("test-channel", TestMessage),
{output, TestMessage}.
pull('GET', [LastTimestamp]) ->
{ok, Timestamp, Greetings} = boss_mq:pull("new-greetings",
list_to_integer(LastTimestamp)),
{json, [{timestamp, Timestamp}, {greetings, Greetings}]}.
live('GET', []) ->
Greetings = boss_db:find(greeting, []),
Timestamp = boss_mq:now("new-greetings"),
{ok, [{greetings, Greetings}, {timestamp, Timestamp}]}.
And the model (greeting.erl):
-module(greeting, [Id, GreetingText]).
-compile(export_all).
validation_tests() ->
[{fun() -> length(GreetingText) > 0 end,
"Greeting must be non-empty!"},
{fun() -> length(GreetingText) =< 140 end,
"Greeting must be tweetable"}].
before_create() ->
ModifiedRecord = set(greeting_text,
re:replace(GreetingText,
"masticate", "chew",
[{return, list}])),
{ok, ModifiedRecord}.
after_create() ->
boss_mq:push("new-greetings", THIS).
Thanks
Romu
can2nac於 2014年1月14日星期二UTC+8下午10時05分09秒寫道：
>
> Actually 'data' is undefined here. --- i think this is the key, post
> controller here.
>
> On Tuesday, January 14, 2014 12:32:50 PM UTC+2, Romu wrote:
>>
>> Hi,
>>
>> I was trying the example in CB tutorial "3. Implementing real-time
>> updates with save hooks", below is my live.html:
>>
>> <html><head>
>> <title>Fresh hot greetings!</title>
>> <script src="
>> http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js
>> "></script>
>> <script>
>> function listen_for_events(timestamp) {
>> $.ajax("/greeting/pull/"+timestamp, { success:
>> function(data, code, xhr) {
>> console.log(typeof data.greetings);
>> console.log(typeof data.greetings !== 'undefined' ?
>> data.greetings.length : 'There is no spoon.');
>> for (var i=0; i<data.greetings.length; i++) {
>> var msg = data.greetings[i].greeting_text;
>> $("#greeting_list").append("<li>"+msg);
>> }
>> listen_for_events(data.timestamp);
>> } });
>> }
>> $(document).ready(function() {
>> listen_for_events({{ timestamp }});
>> });
>> </script>
>> </head>
>> <body>
>> <ul id="greeting_list">
>> {% for greeting in greetings %}
>> <li>{{ greeting.greeting_text }}
>> {% empty %}
>> <li>No greetings!
>> {% endfor %}
>> </ul>
>> </body>
>> </html>
>>
>> When I create a new greeting, the live page does not update with the new
>> greeting, in console I see javascript error:
>>
>> Uncaught TypeError: Cannot read property 'length' of undefined live:10
>> $.ajax.success live:10
>> c jquery.js:3048
>> p.fireWith jquery.js:3160
>> k jquery.js:8235
>> r jquery.js:8778
>>
>> Actually 'data' is undefined here.
>>
>> Browser is Chrome 32.0.1700.72 m. I also tried jquery 1.70 and 2.0.3,
>> same issue.
>>
>> Any idea?
>>
>>
>> Thanks
>> Romu
>>
>
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