[whatwg] reply() extension to postMessage()

Dimitri Glazkov dimitri.glazkov at gmail.com
Thu Feb 14 09:50:54 PST 2008

Speaking of a conversation object: I've been using a Pipe abstraction
with Gears workers to some degree of success. I am wondering if/how
something like this could exist at a spec level.

Pipe in HTML5 SQL player:


Example of usage:



On Thu, Feb 14, 2008 at 11:41 AM, Aaron Boodman <aa at google.com> wrote:
> On Thu, Feb 14, 2008 at 8:58 AM, Anne van Kesteren <annevk at opera.com> wrote:
>  >  You really want reply() to have that callback too (for longer
>  >  conversations) and at that point it starts getting icky.
>  Ah, good point.
>  >  I came up with another idea to address the issue you mention. We let
>  >  postMessage() return a UUID and give MessageEvent an "id" attribute. When
>  >  postMessage() is invoked a UUID is generated and returned. This same UUID
>  >  is set on the event that is dispatched. When reply is invoked on that
>  >  event object it creates an event that again has the same UUID. Both
>  >  parties can have multiple conversations that way by checking the UUID of
>  >  the message.
>  I'm trying to get away from checking IDs because the common case I
>  have seen is either one-way (tell the widget to do something), or
>  two-way (ask the widget for some piece of information). Having to
>  match up IDs is a pain for a simple question/answer.
>  Perhaps there could be a conversation object or something. Maybe
>  that's getting too weird though...
>  - a

More information about the whatwg mailing list