I would do this with chained onSuccess handlers. Each one would
trigger a new request to a different endpoint, carrying some token to
identify the visitor.
$('button').observe('click',function(evt){
//do your lookup
new Ajax.Request('lookup.php',{
parameters:{id:'<?=$id?>'},
onCreate:function(){
$('message').update('searching...');;
},
onSuccess:function(transport){
//make your pdf
$('message').update('making PDF...');;
new Ajax.Request('pdf.php',{
parameters:{id:'<?=$id?>'},
onCreate:..., //you get the idea
onSuccess:...
});
}
}};
});
Walter
On Dec 9, 2009, at 11:11 AM, joe t. wrote:
> i think i've seen examples of this, but can't recall where, and could
> use some guidance.
>
> Obviously it's easy to handle a 1:1 Request/Response
>
> How can i do a true 1:many process? For instance:
> Client takes a single action which requires the server to perform 3
> tasks:
> * Query database
> * Generate PDF
> * Generate email, attach PDF, and send
>
> How can i respond to the client as EACH task is accomplished without
> ending the request chain?
> "Looking up your data . . ." (time-based dots as delay indicator)
> "Creating PDF . . ."
> "Email sent" (or failed, as the case may be)
>
> Is this done with HTTP 2xx headers? Recursive callbacks? If anyone can
> point me in the right direction (which include samples), i'd be
> grateful.
>
> Thanks.
> -joe t.
>
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