Re: [htmltmpl] (newbie) How to populate an array of hash references one by one?

[Timm M. <tm...@ag...>]

><>
># attempt 1
>my @test = ();
>push @test { name=>"foo",value=>"blitz" };
># Gets "Global symbol "%test" requires explicit package name at ...[push
>line]"   !?!?! there is no %test.

You forgot a comma, so Perl interpreted it as something like this:

push @test{'name','foo',value','blitz'};

Adding a comma after @test will make it work


># attempt 2
>my @test = ();
>push @test \{ name=>"foo",value=>"blitz" };
># Gets "Backslash found where operator expected at ...[push line]"

This would have made a reference to a hash reference (if you had the comma 
in), which wouldn't have worked anyway.

><>
># attempt 4
>my @test = [
>         { a=>"b",c=>"d" },
>         { e=>"f",g=>"h" },
>];
>$template->param(itemloop => \@test);
># Gets "HTML::Template->output() : fatal error in loop output :
>HTML::Template->param() : Single reference arg to param() must be a
>has-ref!  You gave me a ARRAY. at ..."

To Perl, you're creating an array, the first element being an arrayref, 
which contains hashrefs.  What you actually wanted to do is:

my @test = (
         { a=>"b",c=>"d" },
         { e=>"f",g=>"h" },
);

Note parens instead of square brackets.


># attempt 5
>my %test;
>$test{"a"}="b";
>$test{"c"}="d";
>$test{"e"}="f";
>$template->param(itemloop => \%test);
># Gets "HTML::Template::param() : attempt to set parameter 'itemloop'
>with a scalar - parameter is not a TMPL_VAR! at ..."

This one is interesting.  Looks like HTML::Template trys to use the hashref 
in its scalar representation (like HASH(0xffffffff)) and then errors out 
when your param isn't a loop.


># attempt 6
>my %test;
>$test{"a"}="b";
>$test{"c"}="d";
>$test{"e"}="f";
>$template->param(itemloop => %test);
># Gets "You gave me an odd number of parameters to param()! at ..."

To Perl, your params are being flatened like this:

$template->param(itemloop => a,
         b => 'c',
         d => 'e',
         f
);

That's because the param method takes a list with all the parameters being 
flattened into a hash.  Since you're putting 'itemloop => ' first, Perl 
sees that as the first element in the hash.  That's why you need to use 
references.

Please read perldsc.

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