knockout.js - KnockoutJS Validation - nested ViewModel as validatedobservable -

i have knockoutjs viewmodel acts "master" viewmodel several modular viewmodels. these modular vm's utilize knockout validated properties own form validations. make these viewmodels validatedobservable in master viewmodel, can check each if isvalid true:

function masterviewmodel() {     var self = this;      self.adduserviewmodel = ko.validatedobservable(new adduserviewmodel()); }  function adduserviewmodel() {     var self = this;     self.username = ko.observable().extend({ required: true });      self.adduser = = function () {         if(self.isvalid()) {             // perform add user logic here         }     }.bind(self); } 

however, isvalid method not exist child viewmodel when attempt call it. there issue adding validatedobservable property function?

the isvalid added function validatedobservable , therefore available inside masterviewmodel.

you use ko.validation.group when want check if model valid inside model itself:

function adduserviewmodel() {     var self = this;     self.username = ko.observable().extend({ required: true });      var errors = ko.validation.group(self, { deep: true });     self.adduser = = function () {         if (!errors().length) {             // perform add user logic here         }     }; }