[dancer-users] Delayed template processing

[John Stoffel]

Thanks for posting your example, this should be documented
somewhere... but I also wonder if you really just need to put a <div>
into your template and have your javascript just load more data from a
seperate route into that div which could then scroll, re-draw, or
whatever.

Basically, if you have a long running process, how would you handle
pagination of the results using your method?  And what does your
view2.tt contain as well?  

Joerg> Thanks to everyone involved I finally managed to get it done;

Joerg> For people with the same problem, here is an example for what I did,

Joerg> my $parameterhash;
Joerg> get '/routeA/:*?' => sub {
Joerg>     my $id = params->{'id'};
Joerg>     my $blub = params->{'blub'};
Joerg>     delayed {
Joerg>        my $tt = Template->new(
Joerg>           {INCLUDE_PATH => "$path",
Joerg>            WRAPPER  => 'layout.tt',           
Joerg>            RELATIVE => 1,
Joerg>           }) || die "Template error: $Template::ERROR\n";
Joerg>        $tt->process('view.tt', {
Joerg>             'id' => $id,
Joerg>             'bla' => $blub
Joerg>         };
Joerg>     content $tt;
Joerg>     done;
Joerg> ## Manual states from here on we can do whatever we want without intereferring with the stream
Joerg>     $parameterhash =
Joerg>         {
Joerg>             'id' => $id,
Joerg>             'bla' => $blub
Joerg>         };
Joerg>     };
Joerg> };

Joerg> get '/routeB/:*?' => sub {
Joerg> ## parameters are now fetched from the parameterhash reference
Joerg>     my $id = $parameterhash->{'id'};
Joerg>     my $blub = $parameterhash->{'bla'};

Joerg> # Do something from here on
Joerg>       my $addition = "something";
Joerg>     delayed {
Joerg>        my $tt = Template->new(
Joerg>           {INCLUDE_PATH => "$path",
Joerg>            WRAPPER  => 'layout.tt',           
Joerg>            RELATIVE => 1,
Joerg>           }) || die "Template error: $Template::ERROR\n";
Joerg>        $tt->process('view2.tt', {
Joerg>             'id' => $id,
Joerg>             'bla' => $blub
Joerg>             'addition' => $addition
Joerg>         };
Joerg>     content $tt;
Joerg>     done;
Joerg> };

Joerg> In the template view.tt
Joerg> I simply added

Joerg> <script type="text/javascript">
Joerg>     $(document).ready( function () {
Joerg> // Javascript URL redirection after 5 seconds
Joerg>     setTimeout(function() {
Joerg>         var str = window.location.href;
Joerg>         var res = str.replace("routeA", "routeB");
Joerg>     window.location.replace(res);
Joerg>     }, 5000);
Joerg>     });
Joerg> </script>

Joerg> which forwards to routeB,
Joerg> seems to work fine.

Joerg> The way I use it now I do not need delayed actually,
Joerg> but it doesn't hurt, so I keep for the moment.

Joerg> Thanks again to everybody!

Joerg> --joerg

Joerg> On 10/16/2015 01:51 PM, Clive Eisen wrote:

Joerg>     Other people have told you how to do this
    
Joerg>     In your template have callbacks to OTHER routes that return the rest of the data as and when it’s available
    
Joerg>     If you  insist use the same route and figure out from a param whether its the initial call or a callback
    
Joerg>     As far as I can tell once you have served a template that request is closed
    
Joerg>     --
Joerg>     Clive Eisen
Joerg>     GPG: 75056DD0

Joerg>         On 16 Oct 2015, at 11:31, Joerg Fallmann <fall at tbi.univie.ac.at> wrote:
        
Joerg>         To circumvent this I thought about forwarding to another route
Joerg>         after processing a template,
Joerg>         this should actually work around the update existing output problem,
Joerg>         but it seems this is not possible either
Joerg>         so I really got no idea how to proceed at the moment.
        
Joerg>         --joerg
        
Joerg>         On 10/16/2015 09:05 AM, Yitzchak Scott-Thoennes wrote:
        
Joerg>             For this to work, you'd either need a template engine that is tightly integrated into Dancer or a streaming template engine (that would call a callback to call content as it got chunks) with the ability to loop over iterators or trigger callbacks to get more data to format.  Though I guess you could use a normal template loop over a tied array too.
            
Joerg>             But I don't know of such a template engine.

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