knockout check/uncheck all combo box

Question

I using knockout for mapping JSON obejct to user control, I have a list of single checkboxes, They look like

 <input type="checkbox" data-bind="checked: IsEnabled1" />

I Have JsonObject

 var viewModel = {
            IsEnabled1 :ko.observable(true),            
            IsEnabled2 :ko.observable(true),
            IsEnabled3 :ko.observable(false)
        };
  ...
  ko.applyBindings(viewModel);

And I want to add global check box that will be check/uncheck all other, I made this changes on JavaScript side but global check box update UI part but they data from separate check boxes doesn't mapping to JSON object .

Global checkbox

  $("#GeneralTable thead tr th:first input:checkbox").click(function () {
            var checkedStatus = this.checked;
            $("#GeneralTable tbody tr td:first-child input:checkbox").each(function () {
                this.checked = checkedStatus;                    
            });

        });

after this code my JSON object contain data that not related to UI.

How to update all JSON after change check boxes from JS side ?

Answer 1

Please check the example: http://jsfiddle.net/MenukaIshan/5gaLjh2c/

I think it is exactly what you need. All items have IsChecked observable property. ViewModel contains computed observable (readable and writeable) to check or uncheck all items.