Retrieves the record GUID (ID) using isDirty function.

isDirty() → This function is used to check whether the form data has been changed but not yet saved.

// JavaScript source code

function retrieveEntityInfo(executionContext) {

    if (executionContext != null) {

        var formContext = executionContext.getFormContext();

        var accountId = formContext.data.entity.getId();

        if (accountId) {

            alert("Account GUID: " + accountId);

        } else {

            alert("This Account record has not been saved yet (no GUID).");

        }

    }

}