How do you find the Component ID for a partial trigger

Summary: In the Oracle documentation is shows you need to find a component ID for your autocomplete rule to auto submit. However, to find the component ID you need to use Inspect Element. Where do you look to find this?

Content (required): This question came up when I was looking for an already delivered rule to base my autocomplete rule off of. In the instructions it tells you to add a component ID to the partial trigger field in page composer. Example below:

You have to add this partial trigger/component ID to auto submit during the action. The problem is this ID is different for every one of the actions and fields. I am trying to default Worker Type based on Recruiting Type in the Create Job Requisition action and there are no delivered rules for this.