Getting Checkbox Value From Json Object

I am currently learning and playing around with the use of the knockout js framework. I have a basic set of fields for contacts. I am able to add contacts without any problems. But

Solution 1:

To enable a checkbox in knockout.js, the correct syntax is

Declare checkbox in HTML as

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

To Enable/Disable checkbox through knockout.js

<script type="text/javascript">
var viewModel = {
    bindName : ko.observable(false),
};
</script>

Change the javascript code to

ko.utils.arrayForEach(contacts, function (contact) {
    self.contacts.push({
        firstName: contact.firstName,
        lastName: contact.lastName,
        phone: contact.phone,
        alt_phone: contact.alt_phone,
        male: ko.observable(contact.male), /* Line Modified */
        female: ko.observable(contact.female) /* Line Modified */
    });

In HTML Change the code for checkbox

 Male <input type="checkbox" data-bind='checked: male' />
 Female <input type="checkbox" data-bind='checked: female' />

JS Fiddle Link - http://jsfiddle.net/dLbY7/15/