PT: Cannot get value of perl variable in tpl file

Hi All,

In my presentation template when I am defining $locale variable in <iw_perl> section. Then outside perl tags I use this tag <iw_value name='$locale'/> to get value of $locale variable. This works fine.

But when I am writing this perl section into A.tpl file and then calling that A.tpl file in Main.tpl file then <iw_value name='$locale'/> is not returning the value of variable $locale which is defined in A.tpl file.

Please tell me how should I get the value of a variable defined in A.tpl file.

I use this tag to include A.tpl into Main.tpl: <iw_include pt='find_Locale.tpl' mode ='ptlocal'/> (it is the first line in Main.tpl)

-Thanks,
Retesh
TS 6.7.1 SP1 @ UNIX

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Frederik

EDIT: oops, I'm sorry, this answers the reverse question: how to send a perl var from main.tpl to included.tpl. It won't help you... I'll leave it anyway

we do that by passing the perl var from the main.tpl to the included.tpl

[HTML]

dct_param_val='$dct' />[/HTML]
If I remember well, all attribute name xyz_param_val are considered passed argument xyz (where xyz is your var name)... Read the doc for iw_include.

Frederik

Could you calculate the variable with function stored in a perl module, rather than with an included tpl. Then you can call the function from main.tpl. If you still need to include the other tpl, and if that tpl needs the value to, then pass the value from main.tpl to included.tpl ?

Alternatively, it may be possible to pass a scalar or hash reference from main.tpl to included.tpl. The doc at http://your_teamsite_servername/iw/help/tst/pt/TeamSite__PT__iw_include.html seems to suggest that, but I've never done it.

retesh

Could you calculate the variable with function stored in a perl module, rather than with an included tpl. Then you can call the function from main.tpl. If you still need to include the other tpl, and if that tpl needs the value to, then pass the value from main.tpl to included.tpl ?

Alternatively, it may be possible to pass a scalar or hash reference from main.tpl to included.tpl. The doc at http://your_teamsite_servername/iw/help/tst/pt/TeamSite__PT__iw_include.html seems to suggest that, but I've never done it.

Hi,

I need to pass value of perl variable from included tpl to main tpl.

I read the document on iw_include. Now I am calling A.tpl in Main.tpl like this:

<iw_include pt='A.tpl' mode='ptlocal' loc_param_val='$locale' />

and using the value of passed perl variable in Main.tpl like this: <iw_value name='$iw_arg{loc}'/>

But this also does not help. My requirement is to call a tpl file so suggest me on that line.

-Thanks,
Retesh

Adam Stoller

Hi,

I need to pass value of perl variable from included tpl to main tpl.

I read the document on iw_include. Now I am calling A.tpl in Main.tpl like this:

<iw_include pt='A.tpl' mode='ptlocal' loc_param_val='$locale' />

and using the value of passed perl variable in Main.tpl like this: <iw_value name='$iw_arg{loc}'/>

But this also does not help. My requirement is to call a tpl file so suggest me on that line.

-Thanks,
Retesh

Try declaring the variable within the Main.tpl - e.g.:[html]my $locale = q(UNKNOWN);[/html]then in your included PT - make sure you do notdeclare the variable, but simply reference, use, and/or set it.

If

my $locale = q(UNKNOWN);

doesn't work - try

our $locale = q(UNKNOWN);

jbonifaci

I don't believe you understood what Frederik was saying. The documentation at /iw/help/tst/pt/TeamSite__PT__iw_include.html clearly shows how to pass a variable to an included tpl. If that variable happens to be a reference, the included tpl could theoretically modify that value and then the main tpl would receive that modification.

This would appear to be the only way to send something from an included tpl back to a parent tpl.

I have never tried this though, so the real question is, has the main tpl finished processing prior to the call to the included tpl? If so, even though the main tpl would technically have access to the modified reference value, it would be useless, as it would not be modified until the main tpl has finished its own processing.

If this is true, then I don't see how one would ever pass anything back to a main/parent tpl.

Try passing the variable by reference instead of by value and see what happens. If the answer is nothing, then this is likely not possible.

~Jeff

Adam Stoller

I don't believe you understood what Frederik was saying. The documentation at /iw/help/tst/pt/TeamSite__PT__iw_include.html clearly shows how to pass a variable to an included tpl. If that variable happens to be a reference, the included tpl could theoretically modify that value and then the main tpl would receive that modification.

This would appear to be the only way to send something from an included tpl back to a parent tpl.

I have never tried this though, so the real question is, has the main tpl finished processing prior to the call to the included tpl? If so, even though the main tpl would technically have access to the modified reference value, it would be useless, as it would not be modified until the main tpl has finished its own processing.

If this is true, then I don't see how one would ever pass anything back to a main/parent tpl.

Try passing the variable by reference instead of by value and see what happens. If the answer is nothing, then this is likely not possible.

~Jeff

Good points - Personally, this is why I prefer to code my PTs in Perl and use modules instead of included PTs...

jbonifaci

Well, I got back from a meeting and was curious about this, so I gave it a quick try. It appears that passing by reference works just fine and the main/parent tpl waits for the include to be processed before continuing.

Main/Parent TPL:
[HTML]

my $localMessageVariable = 'Local Variable Message Value Before Include Call';
iwpt_output($localMessageVariable);

iwpt_output($localMessageVariable);

[/HTML]
And here is Include.tpl:
[HTML]

${$iw_arg{message}} = 'Local Variable Message Value Set In Include TPL';

[/HTML]
And here is the generated output:


Local Variable Message Value Before Include Call
Local Variable Message  Value Set In Include TPL

As you can see, the main/parent is outputing the same message variable twice (once before and once after the include call). But the second time it outputs the variable, it has the value that was set in Include.tpl.

~Jeff

Frederik

thanks Jeff. I see now that my hint to use a reference was too terse ;-) lovely proof of concept

retesh

Thanks to all three of you for showing such keen interest.

I have tried both the methods suggested by Ghoti and jbonifaci using exact example you guys have mentioned in this post.

But none worked in my case. Don't know why?

I think I need to prefer modules instead of PT.

-Thanks,
Retesh
TS 6.7.1 SP1 @ UNIX

jbonifaci

I prefer the perl/module approach as well, but as my POC above shows, there is no reason you shouldn't be able to accomplish this with your tpls. If you want to post your tpl code, I'm sure someone can point out where things aren't working.

~Jeff

Frederik

I believe Jeff's post has been messed up by this forum's funky parsing Smiley Sad

The notification email I received had this:

iw_include pt='Include.tpl' mode='ptlocal' message_param_val='(\$localMessageVariable )'

above in his post, the

message_param_val='(\$localMessageVariable )'

has become

message_param_val='($localMessageVariable )'

.

That's the difference between passing by reference (which should allow Include.tpl to re-assign another value) or passing by value.

about the forum's parsing: The backslash inside an HTML block must be doubled, in order to appear once: write

, see

So retesh, just try again the example of Jeff

Frederik

@retesh: and the fact that you didn't pick that up yourself, would suggest you need to brush up your perl skills on references (also known as pointers) ;-)

jbonifaci

I believe Jeff's post has been messed up by this forum's funky parsing

The notification email I received had this:

above in his post, the
message_param_val='(\$localMessageVariable )'
has become
message_param_val='($localMessageVariable )'
.

That's the difference between passing by reference (which should allow Include.tpl to re-assign another value) or passing by value.

about the forum's parsing: The backslash inside an HTML block must be doubled, in order to appear once: write
\\
, see
\
So retesh, just try again the example of Jeff

Good catch, I've updated my post. I'm not a big fan of the code/html posting abilities in this forum software.

~Jeff

nipper

Good catch, I've updated my post. I'm not a big fan of the code/html posting abilities in this forum software.

~Jeff

Yea and when you miss-hit the golf ball, I am sure it is the club's fault as well.

jbonifaci

Yea and when you miss-hit the golf ball, I am sure it is the club's fault as well.

I never blame the tool when it is my fault. However, when I include something in code or html tags and it appears fine in the preview and then I go and post and it has actually stripped out everything I had within those tags, I find that a bug with the software. Preview should be equal to Post. When Preview != Post, that is a bug.

Who asked for your $.02 anyway? I want a refund...

retesh

I believe Jeff's post has been messed up by this forum's funky parsing

The notification email I received had this:

above in his post, the
message_param_val='(\$localMessageVariable )'
has become
message_param_val='($localMessageVariable )'
.

That's the difference between passing by reference (which should allow Include.tpl to re-assign another value) or passing by value.

about the forum's parsing: The backslash inside an HTML block must be doubled, in order to appear once: write
\\
, see
\
So retesh, just try again the example of Jeff

Hey Frederik,

That's a good catch indeed. I had tried jbonifaci's POC tpl code exactly but it didnt worked probably due to the miss you pointed.

Will work on this POC post this weekend and update it in this post :-)
I have also taken your suggestion positively. Need to brush up my skills at perl.

Thanks Guys,
Retesh