knockout viewmodel property undefined

Answer 1

Use the $data prefix, KO can parse it

Sample: http://jsfiddle.net/baryon/NsuL7/1/

Answer 2

So, there are a few options that you have:

1. KO will have an issue when you try to bind against undefined properties, unless they are off of an object. So, you can prefix your various bindings with $data. and KO will be able to parse your bindings. Sample: http://jsfiddle.net/rniemeyer/dLCL8/ If you know that several properties will always be together, then you could use a with or if statement around those options.

2. A different take on handling "undefined" properties is to create a binding that populates these properties when they are missing. Look at this answer. It would be similar, but potentially with the 'text' binding. Sample: http://jsfiddle.net/rniemeyer/dLCL8/4/