Arunbear is on track with the approach that I use for getting specific items into the <head> section of pages generated from mason. And I use a similar approach for getting page-specific attributes into the <body> tag too:

autohandler:

<%perl>
# does the requested comp have anything special to tell the body tag?
% my $BodyAttr = $m->comp('REQUEST:body_attr') 
%       if $m->request_comp->method_exists('body_attr');
</%perl>

%# THE OUTPUT
<html>
    <head>
        ...
    </head>
</html>

<& 'SELF:body_tag', attrs => $BodyAttr &>

% $m->call next;

</body>
</html>

<%method body_tag>
<%args>
    $attrs => undef
</%args>
<%perl>
    my $att_str;
    if ($attrs && %$attrs) {
        for (keys %$attrs) {
            $att_str .= sprintf qq[ %s="%s"], $_, $attrs->{$_};
        }       
    }       
</%perl>

<body<% $att_str %>>

</%method>

[download]
Other components provide the body tag attributes as a hash ref 
<%method body_attr>
% my $bd_attr = { class => 'support', onload => q[myInit('foo','bar')]
+};
% return $bd_attr;
</%method>

[download]
OUTPUTS: 
<html>
    <head>
        ...
    </head>
</html>

<body class="support" onload="myInit('foo','bar')">

</body>
</html>

[download]

Note: Quickly hacked together example of the approach, untested.

Note2: OP asked about getting init code into the onload attribute of the body tag. I actually use a different approach, but that's a different discussion that is not perl at all.

In reply to Re: Output should have multiple segments by chakram88
in thread Output should have multiple segments by John M. Dlugosz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.