CODEWITHSUNDEEP
javascriptknockout.js
Fiham Zuher
Fiham Zuher

Reputation: 33

Knockout observable variable undefined

I have a viewModel, there is an observable variable but when I assign the value to the observable it will become undefined.

var ScDmfViewModel = (function () {
  var selectedRequestItem = ko.observable("");
  return {
    SelectedItemUom: selectedItemUom,
  };
})();

In another Javascript File I assign the Value 1 to it:

ScDmfViewModel.SelectedItemUom(1);

But As soon as I debug this its value shows

ScDmfViewModel.SelectedItemUom():undefined

Upvotes: 0

Views: 1836

Answers (3)

Fiham Zuher
Fiham Zuher

Reputation: 33

Answer is before i defined the Code I am calling a JSON Call where it will return the Value and Reset the Observable Value. Thats Why Undeifiend

Upvotes: 1

Yvan
Yvan

Reputation: 1121

You can try this. Define a constructor to your ViewModel with the parameter selectedRequestItem and accessor get set for modify your parameter. Like object class. 

// *** definition viewModel ***
function ScDmfViewModel() {

    this.selectedRequestItem  = ko.observable();

    this.setSelectedItemUom = function (value) {
         this.selectedRequestItem(value);
    };

    this.getSelectedItemUom = function() {
        return this.selectedRequestItem();
    };
}

// ** Create vm ** //
var vm = new ScDmfViewModel();

// set data
vm.setSelectedItemUom(1);

// get data
alert(vm.getSelectedItemUom());

http://jsfiddle.net/rniemeyer/LkqTU/

Upvotes: 0

Amit
Amit

Reputation: 46323

I think this is what you wanted:

var ScDmfViewModel = (function () {
  var selectedRequestItem = ko.observable("");
return {
SelectedItemUom: selectedRequestItem
};
})();

Upvotes: 0

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