knockout.js - KnockoutJS - observable object is undefined? -

I'm still new to knockout so I'm hoping someone can help me on this.

This is my visual model:

  baseModel = {logged_in: ko.observable (), alert: ko.observableArray (), Errors: ko.observable ()} ;   
 And in my HTML I have:  
  & lt; Span data-bind = "text: ($ root.errors ['myerror1'] == $ Undefined): $ root.errors ['myerror1']" & gt; & Lt; / Span & gt;   
 I am hoping to drag arbitrary items through AJAX and specify it to me. Errors for property For example, when my response is:  
  object {myerror1: "password is incorrect", error 2: "something else is wrong"}   < P> I expect to show an error in my  span  when I do the following in my AJAX success callback:  
  if (feedback errors! == undefined ) BaseModel.errors = Ko.mapping.fromJS (Reaction Errors, {}, Besodel. Errs);   
 OR,  
  if (feedback. Errors! == undefined) baseModel.errors = response. Errs;   
 Neither  myerror1  shows that I'm bound in HTML, maybe I was doing many things wrong here. I'm not sure what's wrong thanks!   
 
 
 If you are trying to update  errors  new value, You should not set it using  = , but it must be given the new value as the parameter:  
  baseModel.errors ({myerror1: "password incorrect Is ", error 2:" something else is wrong "});   
  Update:  I have seen two additional problems with your code:  
 
 
  Errors  Start as  Undefined ; Set this up better in a blank object, so there will be no error when the first evaluation of the binding occurs:  
  Errors: To .hosable ({})    
 
 If you want a value inside an expression in the  errors  to the  data-band , you get the value of "call" Instead of using it directly:  
  & lt; Span data-bind = "text: ($ root.errors () ['myerror1'] === undefined)? 'Undefined': $ root .errors () ['myerror1']" & gt; & Lt; / Span & gt;     
.