Hi Discipulus,

The main problem you have with the posted code is that you are trying to retrieve the value of your body parameters with the method for retrieving query parameters.

When you get data POSTed from a form, it's transported in the body of the HTTP request (in general, not specific to Dancer). Query parameters are those passed as the query string, e.g. /form?search_for=truth.

Dancer2 provides various ways to access your parameters.

• my $href_of_all_params = params;
• my $single_val = param 'search_for';
• my $single_val = body_parameters->get('search_for');

The three methods for retrieving a certain class of params, body_parameters(), query_parameters(), route_parameters() all return a Hash::MultiValue object, so it is necessary to call a method to get values.

The reason for using Hash::MultiValue, and the reason these methods are recommended in the Dancer2 doc, is so you can, well, have multiple values. This is most commonly seen in query params, e.g.:

/form?multival=bar&multival=baz
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my @values = query_parameters->get_all('multival');
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The documentation for Dancer2 is, like most of the large frameworks, extensive and somewhat tricky to navigate. But it's all there in the manual:

• Retrieving request parameters (Brief entry linking to the following:)
• param
• params
• body_parameters
• query_parameters
• route_parameters

Also:

• You don't see any log output until you configure a logger in your config.yml. E.g.:

  logger:   Console
  engines:
    logger:
      Console:
        log_level:  debug
        log_format: '[%f l.%l] %m'
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  (Shameless plug: I recommend Dancer2::Logger::LogAny.)
• You don't really need to provide the full URL for the form action, a relative path will normally suffice.
• The title value that gets passed to the template engine is consumed by the tag in views/layouts/main.tt for the HTML title of the page. I usually use a different term, "headline" for the title of the content of the page, for clarity.

I made a new pull request to your Github repo incorporating all the above suggestions into your app. The relevant route handler code is shown below.

Hope this helps!

any ['get', 'post'] => '/form' => sub {
    # POST request
    if ( request->method() eq "POST" ) {
        debug "method: POST";         
        debug 'All params: '          . Dumper { params };
        debug 'One param from href: ' . params->{'search_for'};
        debug 'Form params: '         . Dumper body_parameters->mixed;
+ # see Hash::MultiValue
        debug 'Param "search_for": '  . body_parameters->get('search_f
+or');
        debug 'Another way: '         . param 'search_for';
        
        template 'form' => {
            title      => 'Form Test',
            headline   => 'form test POST',
            form_url   => '/form',
            search_for => param 'search_for', # least typing ;-)
        };
    }
    # GET request  
    else {
        template 'form' => {
            title    => 'Form Test',
            headline => 'formtest GET',
            form_url => '/form',
        };
    }
};
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