[dancer-users] How to data into webpage

Richard Reina gatorreina at gmail.com
Fri Aug 21 16:41:05 BST 2015


Hi David,

I was able to get this code to work so thank you very much as it was very
helpful. Now on to try and somehow figure out how I can get the hash
refrence into my bootstrap drop down menu. Ughh...

2015-08-19 22:13 GMT-05:00 David H <untg99 at gmail.com>:

> Hi Richard,
>
> There are two ways that I get info into a page in Dancer/2.
> The first is to use an Ajax call, something like this:
> $("#llinktoclick").click(function(event) {
>     var DoggyName = $('#DoggyName').val();
>
>    event.preventDefault(); // Important to ensure the link doesn't get
> submitted.
>
>     $.ajax({
>      method: "POST",
>      url: "/getDoggyDetails",
>      data:  { Doggy: DoggyName } // Optional, will be sent through as POST
> data ( ie. params->{'Doggy'} ),
>      // you can also use the route, by doing url: "/getDoggyDetails" + '/'
> + DoggyName , instead
>    })
>
>   .done(function( msg ) {
>    // Do something here like clear and append a status box.
>      $('#ResponseText').empty(); // clear
>      $('#ResponseText').append(msg); // append the return value from your
> POST call
>   });
>
> });
>
> Then in your .pm file:
>
> post '/getDoggyDetails' => sub {
>   my $params = request->params;
>   my $doggyName = $params->{'Doggy'} || "Not entered"; # the || stops
> uninitialised value warnings in perl.
>   return "Please enter a doggy name" if $doggyName eq "Not entered";
>   # DO stuff here with $doggyName etc...
>   return "This is the completion message to tell you it is all done";
> };
>
>
> The second way, which is probably what you are more interested in, is to
> pass it directly from the route. With mysql you can probably do a straight
> fetchallhashref and then pass the response directly to the page, then
> iterate through the values with template toolkit.
> With your route in the Dancer pm file:
>
> any [ 'get', 'post' ] => '/pagetoLoad'  =>  sub {
>
>    my $sql = "SELECT * FROM Doggies";
>    # mysql connection stuff etc...
>    # Put it into a hashref
>    # my $doggieRef   = $sth->fetchall_hashref(['ID','DoggyTagID'])); #
> Double attribute version, not common
>    my $doggieRef   = $sth->fetchall_hashref('ID'); # Normal, single
> attribute version
>
>    # The Ref should contain things like $doggieRef->{'1'}{'Name'} =
> "Rover"; because of the way we are iterating it through with Template
> Toolkit.
>    # I would also recommend Data::Dumper to see the contents of your query
>    my $dumperDoggieText = Dumper($doggieRef);
>     print "Doggy text from sql query is: $dumperDoggieText\n";
>   # And, the other important part, sending it to the page.
>
>     template 'templateName.tt', {
>       'Doggies' => $doggieRef,  # Make sure 'Doggies' here is what you
> will iterate through on the page
>      'Testing'   => "This is text to test to make sure this will come
> through", # to test, use this like <% Testing %> on your template page
> }, {};
> };
>
> Then using Template Toolkit, in your template file, you can do something
> like:
>
> <% FOREACH id IN Doggies.keys %>
>
> <% Doggies.$id.Name %>
>
> <% END %>
>
> And also do our little test just to make sure values are coming through.
>
> <% Testing %>
> Which should print out: "This is text to test to make sure this will come
> through" (without the quotes)
>
> In the end Template Toolkit can be a bit confusing with Hashes but it does
> support Perl hashes very well and also nested attributes, (hashes of hashes
> etc...).
>
> I don't have a complete '"working example" on hand but if there is
> anything confusing just let me know and if anyone else sees anything
> blatantly wrong, please shout out.
>
> David
>
>
> On Thu, Aug 20, 2015 at 11:47 AM, Richard Reina <gatorreina at gmail.com>
> wrote:
>
>> Have been learning Dancer2 over the last few weeks and really like it.
>> Wondering if someone can tell me how I can load data from a MySQL database
>> into a dancer rendered page. I am comfortable writing SQL in perl via
>> perl->DBI just don't have any idea how to bring the data from a fetch into
>> a webpage so that I can display it directly on the page or load it into a
>> dropdown menu. Any help is greatly appreciated.
>>
>> Thanks
>>
>> _______________________________________________
>> dancer-users mailing list
>> dancer-users at dancer.pm
>> http://lists.preshweb.co.uk/mailman/listinfo/dancer-users
>>
>>
>
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>
>
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