Ajax data binding using Knockout Js

Question

i am using the knockout js, i am finding diffcult to bind the data while in ajax get method, i have created model, viewModel, and ajax function, i have the ajax method in the same js file where i have created viewModel i am calling the ajax on page load and trying to bind my html with konckout js, i am getting the error userModel is undefined if i give this.name = ko.observale(result[0].name) before the ajax call, after the ajax called it give name is undefined need help

<html>
  <head>
    <script src="js/jquery1.9.js"></script>
    <script src="js/knockout-3.3.0.js"></script>
    <script src="js/knockout.mapping.js"></script>
    <script src="model/usermodel.js"></script>
  </head>

  <body>

    <div>
      <h1><span data-bind="text:user().name"></span></h1>
      <h1><span data-bind="text:user().userName"></span></h1>
    </div>
    <script src="ViewModel/userDetailsViewModel.js"></script>
  </body>
</html>

////Model////
function userModel(result) {
  var self = this;
  this.name = ko.observable(result[0].name); /// give me error undefined before  the ajax call and after ajax call i get the value in result
  this.userName = ko.observable();

}

/////View Model////
var result
var userDetailsViewModel = function(result) {
  self = this;
  self.user = ko.observable(new userModel(result));
};
var mainUserDetailsViewModel = new userDetailsViewModel(result);
ko.applyBindings(mainUserDetailsViewModel);

////ajax called on the page load ////
$.ajax({
  type: "POST",
  dataType: "json",
  url: baseUrl + 'api/xx/xxx',
  data: jason.strigfy(),
  success: function(data) {
    result = data;
    ////I am getting in result json data object 0=["name":"nnnn","Username":"mmmmmm"],
    ////  i am passing this result to ViewModel and to Usermodel Constructor//
    mainUserDetailsViewModel.user(new userModel(result));

  },
  error: function(error) {
    jsonValue = jQuery.parseJSON(error.responseText);
    //jError('An error has occurred while saving the new part    source: ' + jsonValue, { TimeShown: 3000 });
  }
});

Mateen Kajabadi · Accepted Answer · 2018-07-03 16:39:24Z

12

Here is my suggestion to have a clean nested view model.
Example : https://jsfiddle.net/kyr6w2x3/28/

function UserViewModel() {
    var self = this;
    self.UsersList = ko.observableArray([]);

    self.GetUsers = function() {
      $.ajax({
        type: "POST",
        dataType: "json",
        url: baseUrl + 'api/xx/xxx',
        data: jason.strigfy(),
        success: function (data) {
            //Here you map and create a new instance of userDetailVM
            self.UsersList($.map(data, function (user) {
               return new UserDetailViewModel(user);
          }));
        }
      });
    }
   //call to get users list when the VM is loading or you can call it on any event on your model
   self.GetUsers();
}
function UserDetailViewModel(data){
    var self = this;
   self.Name = ko.observable(data.name);
   self.UserName = ko.observable(data.username);
}

ko.applyBindings(new UserViewModel());

View :

 <h1 data-bind="foreach: UsersList">
    <div data-bind="text: Name"></div>
    <div data-bind="text: UserName"></div>
 </h1>

edited Jul 3, 2018 at 16:39

answered Aug 3, 2016 at 15:07

Mateen Kajabadi

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4 Comments

user736893 Over a year ago

jason.strigfy()?

Mateen Kajabadi Over a year ago

@ScottBeeson It's a part of his snippet code that I didn't touch!

user736893 Over a year ago

But why does it seem to work fine on jsfiddle? I'm so confused :)

Mateen Kajabadi Over a year ago

On jsfiddle the ajax is there but it is never being called. Instead there is a map function that does the job! Read the comment!

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