I create a campaign in adobe target which needs to be set some window varaiable value before page load. It was working fine in mbox js. now my production site is migrated from Mbox.js to At.js. After At.js its not executing before page load. is there any way to do that?.
If you are using DTM ensure that _satellite is firing in the <head> section of the page.
Also, if this was an activity created when using mbox.js, it may need to be updated to work with at.js, as per: Migrate to at.js from mbox.js
Append the URL with mboxDebug=console and confirm that all AT actions are rendering successfully
I checked with 'mboxDebug=console' parameter. In console I can see all the AT.js methods are triggering. But still VEC header customized code executing after the page load only.