{"id":160379,"date":"2025-03-27T20:41:19","date_gmt":"2025-03-27T20:41:19","guid":{"rendered":"https:\/\/peraltafinancing.com\/analytics\/gtmtips-undefined-dimensions-wont-get-sent\/"},"modified":"2025-03-27T20:41:19","modified_gmt":"2025-03-27T20:41:19","slug":"gtmtips-undefined-dimensions-wont-get-sent","status":"publish","type":"post","link":"https:\/\/fivemor.com\/?p=160379","title":{"rendered":"#GTMtips: Undefined Dimensions Won&#8217;t Get Sent"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p>This might not sound like a tip to you. You might think, \u201cDimensions won\u2019t get sent? Sounds like a bug!\u201d. You\u2019re wrong. This is one of the awesome features of the GA API, and it\u2019s key to making your tag setups leaner when sending data to Google Analytics.<\/p>\n<p>                <span class=\"simmer\"><br \/>\n  <span class=\"close\">X<\/span><\/p>\n<p>\n    <span class=\"fa fa-md fa-bell\"\/><br \/>\n    <strong>The Simmer Newsletter<\/strong>\n  <\/p>\n<p>\n    Subscribe to the <a href=\"https:\/\/www.simoahava.com\/newsletter\/\">Simmer newsletter<\/a> to get the latest news and content from Simo Ahava into your email inbox!\n  <\/p>\n<p>  <\/span><\/p>\n<h2 id=\"tip-4-undefined-dimensions-are-left-out-of-ga-hits\">Tip 4: Undefined dimensions are left out of GA hits<\/h2>\n<div style=\"aspect-ratio: 1518 \/ 848;\" class=\"figure nocaption\">\n<p>    <a href=\"https:\/\/www.simoahava.com\/images\/2014\/09\/undefined-dimension-not-sent.jpg\" title=\"Undefined dimensions don't get sent to Google Analytics\"><\/p>\n<p>    <img decoding=\"async\" class=\"fig-img\" height=\"848\" width=\"1518\" loading=\"lazy\" src=\"https:\/\/www.simoahava.com\/images\/2014\/09\/undefined-dimension-not-sent.jpg#ZgotmplZ\" alt=\"Undefined dimensions don't get sent to Google Analytics\"\/><\/p>\n<p>    <\/a><\/p>\n<\/div>\n<p>Note that \u2018undefined\u2019 here means the special value <code>undefined<\/code> in JavaScript. For a refresher, <a href=\"https:\/\/www.simoahava.com\/analytics\/fun-with-google-tag-manager-part-1\/\">check this post<\/a>. If you use a macro in a dimension field of Google Tag Manager\u2019s Universal Analytics tags, this dimension will be left out of the hit payload if its return value is <code>undefined<\/code>.<\/p>\n<p>The hit itself will get sent, but the dimension will just be dropped out.<\/p>\n<p>How is this awesome? Well, you might have thought until now that you need two tags for each version of the dimension reference: one for when it has a value, and one when its value is <code>undefined<\/code>. The latter version doesn\u2019t have the dimension field populated at all.<\/p>\n<p>You don\u2019t have to go through this duplication of tags if you learn to use the power of <code>undefined<\/code> in your GTM macros. Just make sure the value is really <code>undefined<\/code> and not <code>'undefined'<\/code>, which is a String.<\/p>\n<p>It\u2019s not just Custom Dimensions this works with. Any fields that are translated into dimensions behave the same way, meaning you can use this to send pretty darn efficient virtual pageviews as well, as they use the Document Path field in your tags.<\/p>\n<\/p><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>This might not sound like a tip to you. You might think, \u201cDimensions won\u2019t get sent? Sounds like a bug!\u201d. You\u2019re wrong. This is one of the awesome features of the GA API, and it\u2019s key to making your tag setups leaner when sending data to Google Analytics. X The Simmer Newsletter Subscribe to the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":160380,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12033],"tags":[25354,14492,45445,11231],"dealstore":[],"offerexpiration":[],"class_list":["post-160379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics","tag-dimensions","tag-gtmtips","tag-undefined","tag-wont"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>#GTMtips: Undefined Dimensions Won&#039;t Get Sent - Som2ny Network<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fivemor.com\/?p=160379\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#GTMtips: Undefined Dimensions Won&#039;t Get Sent - Som2ny Network\" \/>\n<meta property=\"og:description\" content=\"This might not sound like a tip to you. 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