[Templates] Getting keys from a hash

[Karl Dane]

Terrific! That did the job.

I've used $cgi->Vars for ages and never had this trouble before. Guess 
I'd never tried to do this before.

Thanks everyone for all your help.

Karl


Ash Berlin wrote:
> Vars does crazy tied stuff:
> 
>> Many people want to fetch the entire parameter list as a hash in which 
>> the keys are the names of the CGI parameters, and the values are the 
>> parameters' values. The Vars() method does this. Called in a scalar 
>> context, it returns the parameter list as a tied hash reference. 
>> Changing a key changes the value of the parameter in the underlying 
>> CGI parameter list. Called in a list context, it returns the parameter 
>> list as an ordinary hash. This allows you to read the contents of the 
>> parameter list, but not to change it.
> 
> Try doing the following instead
> 
> my $cgihash = { $cgi->Vars };
> 
> 
> On 26 Feb 2008, at 11:17, Karl Dane wrote:
> 
>> Right! So - there's something REALLY weird going on here...
>>
>> To answer Simon, cgihash is from perl's CGI lib: my $cgi = new CGI; my
>> $cgihash = $cgi->Vars;
>>
>> Shouldn't be anything odd about it. But obviously it's behaving
>> differently for some reason.
>>
>> New example. cgihash continues to act as before, but cgihash2 works
>> fine... :
>>
>> cgihash:
>>
>> should tell me this is a hash:
>> [% cgihash %]
>>
>> dump out the contents of the hash:
>> [% USE Dumper %]
>> [% Dumper.dump(cgihash) %]
>>
>> Now give me the keys:
>> [% FOREACH key = cgihash.keys %]
>>  [% key %]
>> [% END %]
>>
>> cgihash2:
>>
>> [%
>>  cgihash2 = {
>>             'a' => 'newentry',
>>             'newbooking' => '1',
>>             'day' => '06',
>>             'monthdigit' => '02',
>>             'year' => '2008',
>>             'room' => '9',
>>             'gender' => 'male',
>>             'beds' => '3',
>>             'nights' => '2',
>>             'submit' => 'Book'
>>           };
>>
>>  %]
>>
>> dump out the contents of the hash:
>> [% USE Dumper %]
>> [% Dumper.dump(cgihash2) %]
>>
>> Now give me the keys:
>> [% FOREACH key = cgihash2.keys %]
>>  [% key %]
>> [% END %]
>>
>>
>> [[ TEMPLATE ENDS ]]
>>
>> ---
>> Output:
>>
>>   cgihash:
>>
>> should tell me this is a hash:
>> HASH(0x8830200)
>>
>> dump out the contents of the hash:
>>
>> $VAR1 = {
>>           'a' => 'newentry',
>>           'newbooking' => '1',
>>           'day' => '06',
>>           'monthdigit' => '02',
>>           'year' => '2008',
>>           'form_FirstName' => 'Charles ',
>>           'form_Name' => 'Bronson',
>>           'form_Address1' => 'home',
>>           'form_Address2' => '',
>>           'form_Address3' => '',
>>           'form_Town' => 'Ambleside',
>>           'form_County' => '',
>>           'form_Postcode' => '',
>>           'form_Country' => 'UK',
>>           'form_Email' => 'david at amblesidebackpackers.co.uk 
>> <mailto:'david at amblesidebackpackers.co.uk>',
>>           'form_TelephoneNo' => '',
>>           'room' => '9',
>>           'gender' => 'male',
>>           'beds' => '3',
>>           'nights' => '2',
>>           'submit' => 'Book'
>>         };
>>
>>
>> Now give me the keys:
>>
>>
>> cgihash2:
>>
>>
>>
>> dump out the contents of the hash:
>>
>> $VAR1 = {
>>           'monthdigit' => '02',
>>           'a' => 'newentry',
>>           'nights' => '2',
>>           'submit' => 'Book',
>>           'room' => '9',
>>           'newbooking' => '1',
>>           'beds' => '3',
>>           'day' => '06',
>>           'year' => '2008',
>>           'gender' => 'male'
>>         };
>>
>>
>> Now give me the keys:
>>
>>  monthdigit
>>
>>  a
>>
>>  nights
>>
>>  submit
>>
>>  room
>>
>>  newbooking
>>
>>  beds
>>
>>  day
>>
>>  year
>>
>>  gender
>>
>>
>>
>> [[ TEMPLATE ENDS ]]
>>
>>
>>
>>
>>
>> Clinton Gormley wrote:
>>> On Tue, 2008-02-26 at 11:00 +0000, Karl Dane wrote:
>>>> I guess my example wasn't a very good one - I just wanted to 
>>>> demonstrate
>>>> that I was getting _nothing_ when using the keys method. If it had
>>>> worked as expected, then it should have returned something like
>>>> 'ARRAY(0x8a8ca58)'
>>>
>>> ... which is what I get when I try it on my system, with this code:
>>>
>>> [%
>>>
>>> cgihash = {
>>>           'a' => 'newentry',
>>>           'newbooking' => '1',
>>>           'day' => '06',
>>>           'monthdigit' => '02',
>>>           'year' => '2008',
>>>           'room' => '9',
>>>           'gender' => 'male',
>>>           'beds' => '3',
>>>           'nights' => '2',
>>>           'submit' => 'Book'
>>>         };
>>>
>>> %]
>>>
>>> should tell me this is a hash:
>>> [% cgihash %]
>>>
>>> dump out the contents of the hash:
>>> [% USE Dumper %]
>>> [% Dumper.dump(cgihash) %]
>>>
>>> Now give me the keys:
>>> [% cgihash.keys %]
>>>
>>> [[ TEMPLATE ENDS ]]
>>> ------------------------------
>>> OUTPUT:
>>>
>>> should tell me this is a hash:
>>> HASH(0x287c4a0)
>>>
>>> dump out the contents of the hash:
>>>
>>> $VAR1 = {
>>>          'monthdigit' => '02',
>>>          'a' => 'newentry',
>>>          'nights' => '2',
>>>          'submit' => 'Book',
>>>          'room' => '9',
>>>          'newbooking' => '1',
>>>          'beds' => '3',
>>>          'day' => '06',
>>>          'year' => '2008',
>>>          'gender' => 'male'
>>>        };
>>>
>>>
>>> Now give me the keys:
>>> ARRAY(0x28c7170)
>>>
>>> [[ TEMPLATE ENDS ]]
>>
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