JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://dl.dropboxusercontent.com/u/15827167/Scripts/knockout.validation.js"></script>

JavaScript

var prop1 = ko.observable().extend({ required: true }),
    prop2 = ko.observable().extend({ required: true });

var validation = ko.validatedObservable([prop1, prop2]);

function resetFields() {
    prop1(undefined);
    prop2(undefined);
}
var vm = {
    prop1: prop1,
    prop2: prop2,
    validation: validation,
    reset: resetFields
};

vm.reset();
console.log(vm.validation.isValid());
prop1.clearError();
prop2.clearError();
console.log(vm.validation.isValid());