Setting a custom destination to map a variable into a Tealium Custom Container Tag

[jason_s]

I am going to implement a custom container tag that needs a variable mapped into it.

I want to map "myID" into "data-domain-script".

Is this the correct way to do it?

        u.data = {
          /* Initialize default tag parameter values here */
          /* Examples: */
          /* "account_id" : "1234567" */
		  
          "base_url" : "https://www.example.com/whatever.js",
          "data-domain-script" : ""
		  
          /* A value mapped to "account_id" or "base_url" in TiQ will replace these default values. */
        };


        /* Start Tag-Scoped Extensions Code */
        /* Please Do Not Edit This Section */
        ##UTEXTEND##
        /* End Tag-Scoped Extensions Code */


        /* Start Mapping Code */
        for (d in utag.loader.GV(u.map)) {
          if (b[d] !== undefined && b[d] !== "") {
            e = u.map[d].split(",");
            for (f = 0; f < e.length; f++) {
              u.data[e[f]] = b[d];
            }
          }
        }
        /* End Mapping Code */
		
        u.data.data-domain-script = u.myID || b.myID;

        /* Start Tag Sending Code */

[Emmanuel_Duriez]

HI Jason_s,

thank you for your enquiry.

Question: What is the expected data source from for u.myID value?

Is it sent throught the custom tag mapping or from the data layer or else?

As a standard pratice, we would expect to see something like this:

from:

 u.data.data-domain-script = u.myID || b.myID;

to:

 u.data.data-domain-script = u.data.myID || b.myID || "";

- u.data.myID => would be from the custom tag mapping
- b.myID => would be from the data layer 

[TealiumJustin]

@jason_s Data mappings are applied automatically in the template code ( u.data )  based on the tag configuration. In your case you need only add the mapping to the tag config: myID -> data-domain-script

Then reference u.data['data-domain-script'] as needed, later in the tag template.

[TealiumJustin]

I updated the documentation to reflect this example.

Tealium Custom Container Tag > Data Mappings

[jason_s]

myID is in the data layer, set by a lookup table extension and mapped into this tag.

So I should change that line as detailed above?

[TealiumJustin]

Can you be more specific? Which line are you asking about and what do you want to change it to?