...
Within a Message or mADL Interaction
In a .js file within the asset manager
In a separate Interaction within an answerSpace
Referencing an external source eg. hosted library
Step 4 of the Forms Builder (customisation step)
Step 3 of the Forms Builder (Calculation field)
Within a Message or mADL Interaction
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Add the appropriate reference to the external source to the Load External Javascript area within your AnswerSpace Setup (AnswerSpace Setup -> Load External Javascript)