Add logic to forms eg only show email opt-in if previously no or blank

[Anonymous]

Is it possible to show fields on a form based on logic, such as:

Only show email opt-in, if person has previously opted-out, or the opt-in for this user is blank?

[Andy_Varshneya1]

In addition to visibility, is it possible to have certain fields only populated if the current value is blank for the lead? For example, a Lead Source is not a field you want constantly updated, but if a new lead is being created, you want the hidden fields to be populated based on the URL parameters.

[Anonymous]

You could also consider enabling progressive profiling in conjunction with some field visibility rules to achieve all the functionality you need (i.e. to have  a field displayed for someone only if it is blank on their record, and not others).

[Alok_Ramsisaria]

Hi Paul,

You can dynamically toggle visibility of form fields as explained here.

Hope this helps!