How to autopopulate fields in an interface?

Question

Scenario:Suppose there are 3 fields(A,B,C). Field A is a custompicker, i want to autopopulate B & C fields on selecting the value in field A. How is it possible,Please help. 
 Basically, i have created an integration to get details from API, then i am fetching A,B,C fields from the response using expression rule.and then saving them into Datastore using a!writeToDataStore(). Now i want an interface in which if i select value in A field, B& C should autopopulate with the values saved in datastore. or if there is any other approach of getting the value directly from API.

alex.ladue · Accepted Answer

If you want the updated value of the local variable to be saved into a rule input, you would need to configure that save to happen when you submit the form. So for example, you could do this in your submit button to update the latest value to your rule input on submission. 
 a!buttonWidget(
 label: "Submit",
 submit: true,
 style: "PRIMARY",
 saveInto: {
 a!save(ri!b, local!b),
 a!save(ri!c, local!c)
 }
)

How to autopopulate fields in an interface?

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