We are trying to set up a process where if a person submits a form, and a non-required field is left empty, we infer that means the person no longer has that item. Example: Bill told us 4 years ago he grows Rice. This year he renews his subscription to our magazine and leaves Rice blank (we cannot pre-fill per print audit rules). We want to have Marketo wipe out his previous answer and assume he no longer grows rice. Can that be accomplished? I thought perhaps have some sort of trigger campaign but that will overload our system and create a log jam in our Campaign Queue. Ideas?

That's the exact situation I covered here: http://blog.teknkl.com/clearing-lead-fields-when-no-value-submitted/

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SOLVED

Null field value if no value is given on form submit

Object.keys as in my example above (it's older than the others and in IE9).