Pagination with in HTML::Template

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks,

I currently have a need to paginate a database query on my website, kind of like search results. I am using HTML::Template so I thought a good module choice to help me with this would be HTML::Page. I am running into a couple of problems though. When I try to use the sample code from the CPAN site, I get the following error:

syntax error at /var/www/fd/entries.pl line 20, near "my "
Execution of /var/www/fd/entries.pl aborted due to compilation errors.
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Here is the code:

#!/usr/bin/perl

use HTML::Pager;
use CGI;
my $query = CGI->new();

# create a callback subroutine to generate the data to be paged
my $get_data_sub = sub {
   my ($offset, $rows) = @_;

   my @return_array;

   for (my $x = 0; $x < $rows; $x++) {
      push(@return_array, [ time() ]);
   }
   return \@return_array;
}

  # create a Pager object
my $pager = HTML::Pager->new(
                             # required parameters
                             query => $query,
                             get_data_callback => $get_data_sub,
                             rows => 100,
                             page_size => 10,
                             debug => 1,
                             );




  # make it go - send the results to the browser.
  print $pager->output;
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Now I know that there is nothing in the code about HTML::Template and sending the output to a .tmpl file, but I was kind of expecting an error relating to that, and not the error that I have listed above. What is wrong? I have googled this too.

Once I do get this to work, how do I display results 1-10 on the first page by default with no user input? Do I make the variables $offset and $rows a default value?

I appreciate everyone's help.
Thank you.

Comment on Pagination with in HTML::Template Select or Download Code

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Re: Pagination with in HTML::Template
by PodMaster (Abbot) on May 01, 2005 at 16:48 UTC

perl -e"my $ERROR = sub {}  my $EEEEK = 1;"
--------------------------^
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MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
** The third rule of perl club is a statement of fact: pod is sexy.

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Re^2: Pagination with in HTML::Template

by Anonymous Monk on May 01, 2005 at 17:54 UTC

Now how do I populate that with data? I am trying this:

my $dbh = DBI->connect( "dbi:xxx:xxx", "xxxx", 'xxxx');
                my $sth = $dbh->prepare('SELECT title, url FROM fd_ent
+ries ORDER BY timestamp DESC LIMIT 200');
                $sth->execute();

# create a callback subroutine to generate the data to be paged
my $get_data_sub = sub {
   my ($offset, $rows) = @_;

   #my @return_array;
    my $return_array = $sth->fetchrow_array();

   for (my $x = 0; $x < $rows; $x++) {
      push(@return_array, [ $data[$offset + $x]{title},
                            $data[$offset + $x]{url}
                          ]
      );
   }
   return \@return_array;
}
;
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Thank you.

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Re: Pagination with in HTML::Template
by eibwen (Friar) on May 01, 2005 at 16:41 UTC

~~I believe your error lies in the trailing comma in your $pager definition.~~

Additionally, don't forget to use strict; and use warnings (or -w). If you can't make sense of perl's error messages, try use diagnostics;

To return a subset of the results, you're probably looking for an array splice.

UPDATE: I didn't (initially) have a copy of HTML::Pager to parse this through strict and warnings. As PodMaster pointed out, the problem lies in the omitted ; Nevertheless, use of strict and warnings would likely have precluded this problem in the first place:

Read more... (188 Bytes)
Global symbol "$pager" requires explicit package name at tmp line 36.
tmp had compilation errors (#1)
    (F) Probably means you had a syntax error.  Common reasons include:

        A keyword is misspelled.
        A semicolon is missing.
        A comma is missing.
        An opening or closing parenthesis is missing.
        An opening or closing brace is missing.
        A closing quote is missing.Read more... (983 Bytes)

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