post(){
         this.display("submit the list of contacts to server.");

         $.ajax({
             url: "/GetContacts",
             type: "POST",
             dataType: "json",
             data: JSON.stringify(ko.toJSON(this.contacts())),
             success: function (data) {
                       alert(data)
                    }
         });

         return false;
    }

 constructor(params) {
     console.log('page-home');
     console.log('params='+JSON.stringify(ko.toJSON(params)));
 };

 // Convert a model object to JSON
 static json(rootObject, space, replacer) {     // replacer and space are optional
     return ko.toJSON(rootObject, replacer, space);
 };

 public static save(data: Object)
 {
     var json = ko.toJSON(data);
     ConfigFile.saveJson(json);
 }