[dancer-users] How to data into webpage

[Attila Bárdi]

Hey,

in your view:

<select …>
[% FOREACH ent IN YourHash.keys %]
<option value="[% ent %]" >[% ent %]</option>
[% END %]
</select>

Dancer + Template Toolkit are pretty easy to use, simple and effective:)

> On 21 Aug 2015, at 17:41, Richard Reina <gatorreina at gmail.com> wrote:
> 
> 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 <mailto: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 <mailto: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
> 
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> 
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