[Laszlo-dev] Fwd: [JIRA] Created: (LPP-4632) Dataset, doesn't send oninit event

[André Bargull]

What about waiting for canvas-"oninit" before sending the "ondata"-Event 
of a static dataset? That'd one of the easiest solutions to guarantee 
that every listener is fully initialized.

P T Withington wrote:
> On 2007-09-03, at 09:41 EDT, Henry Minsky wrote:
>> On 9/3/07, P T Withington <ptw at openlaszlo.org> wrote:
>>     
>>> It would make sense to me that a static dataset would send an
>>> 'ondata' event at startup.  It seems like a reasonable thing to  
>>> expect.
>>>
>>> But.  I bet that is going to raise the issue of what should happen if
>>> someone sends an event and no one is listening.  It is easy for me to
>>> imagine that a static dataset might send this event before the
>>> relevant listeners have been initialized sufficiently to be  
>>> listening.
>> I think that's what is happening, the startup for initialiazing the
>> dataset calls this routine
>> function setData( data , headers ) {
>>     if ( data == null ) return;
>>     if (data instanceof Array) {
>>         this.setChildNodes( data );
>>     } else {
>>         this.setChildNodes( [data] );
>>     }
>>
>>     this.data = data;
>>
>>     if ('responseheaders' in this && this.responseheaders != null) {
>>         this.responseheaders.destroy();
>>     }
>>     this.responseheaders = headers;
>>
>>     if (this.ondata.ready) this.ondata.sendEvent( this );
>> }
>>
>> And I suspect that the last line, "if (this.ondata.ready) " is
>> returning false because
>> some listener isn't set yet (what makes an event "ready"?)
>>     
>
> Well I would propose a wakeup-waiting solution, but I think that is  
> too risky for Wafflecone.  Note that implementing that would mean we  
> would lose Max's .ready optimization.

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