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How to test for existance of variable

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/dev/null	Friday 29 December 2006 12:40:02 am <b>Question</b> How would one test for existence of a template variable, or template object item ($module_result.node_id) without triggering template error, warning or notice when the 'node_id' does not exist? I am tuning all my custom templates for performance. I am finding errors of this nature are accumulating in my custom templates. I have not yet seen how to avoid this problem. <b>Example - Error</b> Error: eZTemplate @ extension/example_com/design/example_com/templates/page_head.tpl:30[7] Dec 29 2006 03:10:56 No such attribute for array(7): node_id Choose one of following: content, is_default_navigation_part, navigation_part, ui_context, ui_component, path, uri <b>Example - Template</b> file, 'extension/example_com/design/example_com/templates/page_head.tpl' <title>{if $module_result.node_id\|eq(2)}{$site.title\|wash}: {$site.description\|wash} : Home{else}{$site_title}{/if}</title> <b>Example - Url/Uri</b> http://example.com/shop/checkout <i>/dev/null</i> eZpedia community documentation project: http://ezpedia.org
Kristof Coomans	Friday 29 December 2006 1:12:36 am Hi /dev/null You can use the is_set operator: http://ez.no/doc/ez_publish/technical_manual/3_8/reference/template_operators/variable_and_type_handling/is_set independent eZ Publish developer and service provider \| http://blog.coomanskristof.be \| http://ezpedia.org
/dev/null	Friday 29 December 2006 1:19:18 am That Worked Great! Many Thanks! <i>/dev/null</i> eZpedia community documentation project: http://ezpedia.org
Kristof Coomans	Friday 29 December 2006 2:51:07 am I added a page to eZpedia which makes it easier for people familiar with PHP to switch to the template language: http://ezpedia.org/wiki/en/ez/template_language_for_php_developers I'm not sure this helps you /dev/null. If you are familiar with other template/scripting/programming languages, feel free to add your own page on eZpedia to compare them with the eZ template language. independent eZ Publish developer and service provider \| http://blog.coomanskristof.be \| http://ezpedia.org
/dev/null	Friday 29 December 2006 3:30:45 am Kristof! That is a very fine page! <i>I know I have pine'd for such a page of documentation on several occasions in the past. Thank you</i> Perhaps entries could be added for asp.net, cfml, perl, sql, ruby, python by others if needed, which would be the first language after php to add an entry for?? <i>/dev/null</i> eZpedia community documentation project: http://ezpedia.org
Kristof Coomans	Friday 29 December 2006 3:38:20 am sql seems rather strange to compare with the template language ;-) independent eZ Publish developer and service provider \| http://blog.coomanskristof.be \| http://ezpedia.org
David Boman	Friday 29 December 2006 7:28:08 am I agree with /dev/null - this is a very good page and I know for sure that I will use it alot when i code templates! Thanks!