Some render update examples.

gistfile1.erl

Example #1:

event({submit, {new_message, Args}, _TriggerId, _TargetId}, Context) ->
    UserId = proplists:get_value(userid, Args),
    Message = z_context:get_q("chat_message", Context),
    mod_signal:emit({insert_new_message, [{msg, Message}, {userid, UserId}]}, Context),
    z_render:wire([ {reset, [{target, "global-chat-form"}]},
                    {focus, [{target, "chat_message"}]}
                  ], Context);

%% How it's called in the template
%% {% wire id="global-chat-form" type="submit" postback={new_message userid=m.acl.user} delegate="hotseat" %}

% Notice using proplists to get values from template variable vs. get_q for variable from query args 
% z_render:wire normally takes the same variables as those in the template language as a list of proplists



Example #2:

event({postback, {mark_correct, Args}, _TriggerId, _TargetId}, Context) ->
    QuestionId = proplists:get_value(id, Args),
    ChoiceId = proplists:get_value(choice_id, Args),
    Props = [{answer, ChoiceId}],
    case m_rsc:update(QuestionId, Props, Context) of
       {ok, QuestionId} ->
            z_render:wire([
                           {update,[ {target, "choice-sorter-" ++ z_convert:to_list(QuestionId)},
                                     {template, "_choice_list.tpl"},
                                     {id, QuestionId}]}
                          ],Context);
       _ -> z_render:growl("Error selecting answer", "error", true, Context)
    end;

Example #3:

event({postback, {redirect, Args}, _TriggerId, _Target_id}, Context) ->
    SessionPid = Context#context.session_pid,
    Dispatch = {dispatch, z_convert:to_atom(proplists:get_value(dispatch, Args, "home"))},
    case proplists:get_value(id, Args) of
        undefined -> Dispatch1 = [Dispatch];
        Id -> Dispatch1 = [Dispatch,{id, Id}]
    end,
    ?DEBUG(Dispatch1),
    Script = z_script:get_script(z_render:wire([ {redirect, Dispatch1}], Context)),
    F3 = fun(X, Acc) -> case X == SessionPid of true -> Acc; _ -> [X|Acc] end end,
    Pids = z_session_manager:fold(F3, [], Context),
    [z_session:add_script(Script, Pid) || Pid <- Pids],
    Context;

%% How it's call from a template
%%   {% button text="Home" class="btn btn-success" action={postback
%%                                                       postback={redirect dispatch="home"}
%%                                                       delegate="hotseat"}


%% Notice how you can use the ?DEBUG macro
%% Notice how you can fold over all the session pids and send scripts to each one of them