Knockout ViewModel

index.js

$(function() {

  var viewModel = function() {
      var self = this;
  
      self.address = ko.observable("Portland");
      
      self.list = ko.observableArray();
      self.hasData = function(){return self.list().length > 0;};
  
      self.search = function() {
              self.list.push({ addr: "Item01" , index: 1 });
              self.list.push({ addr: "Item02" , index: 2 });
              self.list.push({ addr: "Item03" , index: 3 });      
      };
  };
  
  var vm = new viewModel();
  ko.applyBindings(vm);
});