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CGI::Ajax + Template::Toolkit Question

by stonecolddevin (Vicar)
on Mar 07, 2007 at 03:46 UTC ( #603559=perlquestion: print w/ replies, xml ) Need Help??
stonecolddevin has asked for the wisdom of the Perl Monks concerning the following question:

UPDATE: Got it working. See readmore for code.

#!C:/xampp/perl/bin/perl.exe -w use strict; use CGI; use CGI::Ajax; use Template; # for template toolkit support use CGI::Carp qw[fatalsToBrowser]; #DEBUG ONLY my $config = { INCLUDE_PATH => 'tt/', # or list ref }; my $cgi = CGI->new; my $pjx = CGI::Ajax->new( 'login' => \&do_login ); my $tt = Template->new($config); print $pjx->build_html($cgi, \&main_page); sub do_login { my $input = shift; # do something with $input my $output = $input . " was the input!"; return( $output ); } sub main_page { my $template = 'main.tt'; my $vars = { title =>'AJAX Test' }; my $output = ''; $tt->process($template, $vars, \$output) || die $tt->error(), "\n"; return $output; }

Hey gang.

This is probably something that's right in front of my face, but I'm attempting to get started on some AJAX using CGI::Ajax and Template (to handle HTML processing). The demo from the docs ran great, however my code is throwing this error:

malformed header from script. Bad header=<html><head><s +cript type="text: ajax.cgi

Not only that, but it's returning the HTML as text to the browser.

Here's my code:

#!C:/xampp/perl/bin/perl.exe -w use strict; use CGI; use CGI::Ajax; use Template; # for template toolkit support use CGI::Carp qw[fatalsToBrowser]; #DEBUG ONLY my $config = { INCLUDE_PATH => '/tt', # or list ref INTERPOLATE => 1, # expand "$var" in plain text POST_CHOMP => 1, # cleanup whitespace PRE_PROCESS => 'header', # prefix each template EVAL_PERL => 1, # evaluate Perl code blocks }; my $cgi = CGI->new; my $pjx = CGI::Ajax->new( 'login' => \&do_login ); my $tt = Template->new(); print $pjx->build_html($cgi, \&main_page); sub do_login { my $input = shift; # do something with $input my $output = $input . " was the input!"; return( $output ); } sub main_page { my $template = "main.tt"; return $tt->process($template, { title =>'AJAX Login'}) or die $tt-> +error; }

Any ideas? I'm thinking it's something to do with how build_html in CGI::Ajax tries to cope with process in T::T.

Thanks in advance!

meh.

Comment on CGI::Ajax + Template::Toolkit Question
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Re: CGI::Ajax + Template::Toolkit Question
by chargrill (Parson) on Mar 07, 2007 at 04:16 UTC

    From the error, it looks like you haven't printed out any HTTP headers. Try print header(); before calling print $pjx->build_html. Also, you might want to actually make use of that $config hashref you've setup there in your call to Template->new( $config ).

    Also, if CGI::Ajax is building some HTML, what's Template going to do for you?

    Unfortunately not using CGI::Ajax, but just T::T (which is where I think you're hitting a snag), the following snippet might help:

    #!/usr/bin/perl use strict; use warnings; use Template; use CGI qw/:standard/; # ... print header(-charset=>'utf-8'); my $vars = { # ... blah blah blah }; my $template = Template->new( INCLUDE_PATH => '/www/path_to_blah/templates/', ); $template->process( q/template.tt/, $vars );


    --chargrill
    s**lil*; $*=join'',sort split q**; s;.*;grr; &&s+(.(.)).+$2$1+; $; = qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
Re: CGI::Ajax + Template::Toolkit Question
by randyk (Parson) on Mar 07, 2007 at 05:12 UTC
    It may be that CGI::Ajax expects build_html to return the html (or updated html) for the page. However, by default, $tt->process($template, $vars) will print the processed output to STDOUT. Try something like the following:
    sub main_page { my $output = ''; $tt->process($template, $vars, \$output) || die $tt->error(), "\n"; return $output; }
    which will stuff the processed template into $output.

      Using randyk's solution, i get the following error (from CGI::Ajax):


      Problems

      with the html-generating function sent to CGI::Ajax object


      Current code:

      sub main_page { my $output = ''; my $template = 'main.tt'; $tt->process($template, $config, \$output) || die $tt->error(); return $output; }

      Template code:

      (header.tt)

      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:/ +/www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <head> <title>[% title %]</title> </head> <body>

      (main.tt)

      <body> <p>Please log in.</p> <p>Username: <input type="text" name="username" id="username" /></p> <p>Password: <input type="password" name="passwd" id="passwd" /></p> <p><input type="submit" name="login" value="login" onClick="login(['us +ername'], ['passwd'], ['authenticated']);"/></p> </body> </html>

      I'm not sure what this error means coming from CGI::Ajax. It's a little unspecific, and I don't see anything in the docs regarding it.

      meh.
        Rather than passing the configuration variables in $config to process, as chargrill noted, you can specify these when creating the $tt object:
        my $config = { INCLUDE_PATH => '/tt', INTERPOLATE => 1, POST_CHOMP => 1, PRE_PROCESS => 'header', EVAL_PERL => 1, }; my $tt = Template->new($config);
        and then specify the variables you want processed in your template in process:
        sub main_page { my $output = ''; my $template = 'main.tt'; my $vars = { title =>'AJAX Login'}; $tt->process($template, $vars, \$output) || die $tt->error(); return $output; }

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