Subj : webv4 add menu items
To   : echicken
From : Roxanne
Date : Sun Apr 05 2020 07:32 pm

>   Re: webv4 add menu items
>   By: Mortifis to echicken on Sun Apr 05 2020 03:54:51

> The file root/api/events.ssjs is an HTTP EventSource and has the emit()
> function in it.

> The client requests this page and remains connected. Events are streamed to
> tbe browser as they happen. This was a change I introduced in a move away
> from having the browser poll the server at intervals for updates (new
> telegrams, who's online, etc.).

> The event emitters are in lib/events/. Clients can subscribe to any of the
> event types in there.

> An event emitter must expose a 'cycle' function. events.ssjs will call this
> function during its loop. The 'cycle' function should check for new data to
> send, and then push it to the client.

> Pushing an event to the client is a matter of calling 'emit', as in:

> emit({ event: 'my_event', data: 'some data' });

> or:

> emit({ event: 'an_event', data: { an: 'object' } });

> 'data' can be a string or an object.

> On the client side, there's a function included in (I think) every page
> called registerEventListener, so you would need to do something like this,
> client-side, in JS:

> registerEventListener('my_event', function (e) {
>   const data = JSON.parse(e.data);
> });

> Now whenever the server pushes a 'my_event' to the client, this function will
> be called. You can do whatever you need to with 'e', which is the object that
> your event emitter passed to emit().

> ---
> echicken

excellent explaination, thank you!

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