Need to parse sections of meta data

[patrick_heavey]

We have the following i metadata:

<meta name="asset_topics" content="[{"sequence":"1","topic":{"topicId":"309","topicName":"Nutrition","topicTaxonomy":"Fitness and well-being/Food and nutrition/Nutrition"}}]" />

I want to set "topicTaxonomy" to a UDO variable.  Suggestions?  Thanks.

[meng_lim]

Do you have jQuery loaded on your page @patrick_heavey?

[dave_milsom]

First, define the meta data element in TiQ so that Tealium is aware of it - make sure type is "Meta Data Elements":

Also add a new UDO topic_taxonomy data source.

In a Set Data Values extension scoped to All Tags you can set the topic_taxonomy UDO variable to the parsed value setting the variable to js code (note the code text is truncated in the image below):

JSON.parse(b['meta.asset_topics'])[0].topic.topicTaxonomy 

Note that this will generate an error if the asset_topics meta tag does not exist. If there will be cases where it won't exist on the page, you can check for its existence:

(typeof b['meta.asset_topics'] != 'undefined') ? JSON.parse(utag.data['meta.asset_topics'])[0].topic.topicTaxonomy : ''

If your utag.js version is >= 4.38 you have the option of having this extension running before load rules if needed.

[patrick_heavey]

Yes, we do.

[patrick_heavey]

Unfortunately this didn't seem to work - nothing's being passed. :manfrustrated:

[dave_milsom]

@patrick_heavey 

The issue is that you have non-encoded double quotes within other double quotes in the meta tag. 

The meta tag content value is being read as "[{" becuase of the closing double quote.

To solve this you can use single quotes instead within the content value:

<meta name="asset_topics" content="[{sequence':'1','topic':{'topicId':'309','topicName':'Nutrition','topicTaxonomy':'Fitness and well-being/Food and nutrition/Nutrition'}}]" />

Note that this is not a Tealium issue. Search engines will stop at the second double quote as well.