Adding properties to the view model created by using the Knockout JS mapping plugin

Question

I am working through the mapping plugin example on the Knockoutjs website.

This is the example data.

Knockout JS Mapping Plugin

var data = {
         


        

Answer 1

Note that to define additional computed observables on a child you will need to pass another set of mapping options

var mapping = {
  create: function(options) {
    //customize at the root level.  

    var mapping2 = {
      'children': {
        create: function(options) {
          //customize children also

        }
      }
    }

    //call ko.mapping.fromJS on the options.data as well with further customization
    ko.mapping.fromJS(options.data, mapping2, this);
  }
};