Show template variable only when existing

43 Posts

bnetz Reply #1, 16 years, 4 months ago

Hi,

I got this little problem:
in my pages i show a chunk which uses a template-variable (see here).

but i want this chunk only to be shown when a template variable for this entry exists. it the TV doesn’t exist i don’t want the chunk to be shown. is this possible?

thanks for any suggestion in advance!

☆ A M B ☆
24,524 Posts

sottwell Reply #2, 16 years, 4 months ago

You can use a snippet or PHx.

The snippet:

<?php
$output = '';
$TV = $modx->getTemplateVar('file_name','value', $modx->documentIdentifier);
if(!empty($TV)) {
    $output = $modx->getChunk('chunk_name');
}
return $output;
?>

Chunk using PHx

[*file_name:ifempty=``:else=`<a href="[*file_name*]">Get File</a>`*]

although I’m sure somebody better with PHx will be able to give a better usage for it.

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43 Posts

bnetz Reply #3, 16 years, 4 months ago

sottwell, thank you for your suggestions!

i have the following problems:
with phx i am not familiar, but the code you posted is for evolution, right? i don’t know how i would use it with revolution (and i don’t find a documentation?!); perhaps anybody has any idea how to translate it into "revolution"-phx-language? it seems to me this would be the most simple solution.

the snippet-solution you posted doesn’t work for me. wouldn’t it be possible to work with the snippet WITHOUT using the chunk, means that i use the getTemplateVar to retrieve the value of the variable?
it seems to me slightly complex calling the snippet which calls the chunk which calls the variable. i tried things like the following, but i do not fully understand the concept of the getTemplateVar-API:

<?php
$output = '';
$tv = $modx->getTemplateVar('pdf_praesentation');
// maybe have to enter something like $tv_content = $tv['value']; but this doesn't work
$output = "<a href='xy/" . $tv . "'>download</a>";

return $output;
?>

so perhaps somebody could help me out with this ... thanks in advance!

3,975 Posts

Zaigham (aka zi) Reply #4, 16 years, 4 months ago

PLease see: http://svn.modxcms.com/docs/display/revolution/Input+and+Output+Filters

All docs for Revolution here: http://svn.modxcms.com/docs/display/revolution

Some Addons docs here: http://svn.modxcms.com/docs/display/ADDON

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43 Posts

bnetz Reply #5, 16 years, 4 months ago

thank you zi. i didn’t know that PHx doesn’t exist in Revolution anymore.

for me i would not understand how to use the output-filters to make an if-else-construction. i see there is an modifier "ifempty", but i would not understand how to use it in my case. perhaps you could give an example for the others reading this thread.

i now generated a solution with getTemplateVarOutput, which doesn’t need a chunk anymore, based on sottwell’s suggestion:

<?php
$output = '';
$tv_value = $modx->getTemplateVarOutput(array('name_of_templatevariable'));
if(!empty($tv_value['name_of_templatevariable']))
{
$output = "<iframe src = 'xy/" . $tv_value['pdf_praesentation'] . "#pagemode=none&toolbar=0' width='550px' height='375px'  frameborder='0'></iframe>";
}

return $output;
?>

thanks again for all your fast and useful help!

(my case closed)

3,975 Posts

Zaigham (aka zi) Reply #6, 16 years, 4 months ago

For if-else stuff, there is IF snippet, please see: http://svn.modxcms.com/docs/display/ADDON/If

Zaigham R - MODX Professional | Skype | Email | Twitter

Digging the interwebs for #MODX gems and bringing it to you. modx.link

122 Posts

hgw Reply #7, 16 years ago

Hello,

I found that the phx example code from above

[*file_name:ifempty=``:else=`<a href="[*file_name*]">Get File</a>`*]

does not work, my TV is an image with display type image.

This is my code:

[*motivGross1:ifempty=``:else=`<li>[*motivGross1*]</li>`*]
[*motivGross2:ifempty=``:else=`<li>[*motivGross2*]</li>`*]
[*motivGross3:ifempty=``:else=`<li>[*motivGross3*]</li>`*]

It shows the else part even if motivGrossX TV isn’t filled. Any suggestions?

I’m using Evo 1.0.4 and Phx 2.1.4.

P.S.: It seems to work this way:

[*motivGross1:is=``:else=`<li>[*motivGross1*]</li>`*]
[*motivGross2:is=``:else=`<li>[*motivGross2*]</li>`*]
[*motivGross3:is=``:else=`<li>[*motivGross3*]</li>`*]

Not sure why ifempty doesn’t work.

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