Re: loop through a hash structure without knowing the hash keys?

The coupling of a template to the template-params is something that cant 
really be avoided - at some point the template designer has to have some 
understanding of what template-variables are being generated.  Since you 
are the developer creating the code that generates the 
template-variables, it is your responsibility to "publish" the variable 
names and their meaning, it is not up to the template designer to 
"figure out" what they are and what they represent.

That said, there is a justified argument for wanting something like a 
<TMPL_DUMP some_var> which writes a dumped-block into the target page.

Mathew

PS. I maintain a version of H::T which supports sub-classing so that you 
can create your own TMPL tags, see: http://members.optusnet.com.au/~mathew


Boon Chew wrote:

> I want a way to quickly display all the info in a var - a Dumper 
> output if you will.  But more than that, like in some other 
> server-side language, you can query the column lists (or hash keys) 
> and loop through those and use a piece of generic code when all you 
> intend to do is to display everything in the var.
>
> Imagine yourself wanting to output all the info in a reference to an 
> array of hashes (which essentially mimics a database table), the HTML 
> code can really be made the same if a construct is available to loop 
> through things.
>
> The tight coupling of knowledge between what's being sent from the 
> perl code and the HTML can be avoided, that's the whole point of the 
> design of the template module (vs Mason where you mingle Perl code 
> with display code) right?  It just seems ugly when I have to tell a 
> designer to go look at the perl file to see what he is getting in the 
> var.  He should be able to find that out from some sensible constructs.
>
> - boon
>
> */Mathew Robertson <[email protected]>/* wrote:
>
>     It sounds like you need a tool which simply dumps the template
>     variable names (ie: using the $ht->params() function), rather than
>     some special mode to H::T
>
>     Mathew
>
>     Boon Chew wrote:
>
>>     Ya sorry, that's what I meant.
>>
>>     Right now I am working on some site code, and the designer
>>     sometimes have to come to me for stuff because he doesn't always
>>     know what hash keys I am passing to him (say sometimes I might
>>     add a new one, sometimes he mistype one, etc.).  The whole point
>>     of doing this template separation is to decouple things, but if
>>     the designer can only figure out what's being passed into the
>>     template by looking at the module code, it kinda defeats the
>>     whole purpose.
>>
>>     It would be such great convenience to be able to dump the whole
>>     thing on the HTML with a call like this:
>>
>>     <tmpl_var story_loop>
>>
>>     or
>>
>>     <tmpl_loop story_loop>
>>       <column_var>   <-- outputs all keys here
>>     </tmpl_loop>
>>
>>     */Carl Franks <[email protected]>/* wrote:
>>
>>         > e.g.
>>         >
>>         >
>>         >
>>
>>         a TMPL_LOOP doesn't take a hash, it takes an array-ref of
>>         hash-refs
>>         that would be
>>
>>         my @loop = (
>>         {name => 'a'},
>>         {name => 'b'},
>>         );
>>
>>         $tmpl->param( students => \@loop );
>>
>>         If you knew that already, give an example of what sort of
>>         data you
>>         want to put in, and what you want the HTML to look like.
>>
>>         Cheers,
>>         Carl
>>
>>
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