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var value = FormUtil.getValue("field1");

// you could also use it to get value from a subform
// FormUtil.getValue("subformElementId_subformTargetFormId_subformFieldID")

// using Expenses Claim App as an example, and you are in the ExpensesClaim form and wish to get the title value from the subform
// parent form ID = ExpensesClaim
// subform ID in parent form = sfD
// child form ID = ExpensesClaimNew
// the field ID = titlevartitle

var value = FormUtil.getValue("fDsfD_ExpensesClaimNew_title");