使KnockOut可观察的数组属性可观察

Question

I have a observable array AllItems defined as

var ViewModel = function () { 
  var self = this; 
  self.AllItems = ko.observableArray([]);
}

It gets filled by data from a ajax call and I just add the properties received from the Ajax call directly to the array without defining them.

I am using it in the below HTML to populate a table.

 var ViewModel = function() { var self = this; self.AllItems = ko.observableArray([]); } $(document).ready(function() { ko.applyBindings(new ViewModel()); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.1/knockout-min.js"></script> <table> <tbody data-bind="foreach: AllItems"> <td> <span>$</span><span data-bind="text: $data.RequestedPrice"></span> </td> <!-- ko ifnot: (Number(RequestedPrice) > Number(ItemDetails.SmPrice)) --> <input type="button" disabled value="Approve" id="Approved" data-bind="click: $root.ApproveItem" style="background-color:#e1eae5 !important" /> <!-- /ko --> <!-- ko ifnot: (Number(RequestedPrice) > Number(ItemDetails.SmPrice)) --> <input type="button" disabled value="Approve" id="Approved" data-bind="click: $root.ApproveItem" style="background-color:#e1eae5 !important" /> <!-- /ko --> <nobr>$ <input type="text" class="priceChange" onkeypress="return isNumberKey(event)" style="display:inline !important" data-bind="value: $data.RequestedPrice" /> </nobr> </tbody> </table> 

SO i have three things in the above HTML. First I am just displaying the text of the requested price. Second I am using it to disable a button and third I am making it a editable field.

The issue is that when I change the value it is not reflected in the text and also the second case where it is used to disable a button is not updated. Can someone please tell me what I need to achieve this.

Answer 1

Three options:

• Write a custom mapping from your js(on) coming from the back end to objects that do have observable properties;
• Use ko.mapping ;
• Use knockout.es5 with some custom code;

Knockout, as oppossed to Angular 1, requires you by default to be explicit about which stuff you want to be observable (when using ko.mapping you're explicitly saying all the stuff is observable).