// Register a binding for checkbox. ko.bindingHandlers.change = { init: function (element, valueAccessor) { var value = valueAccessor(); $("#jqxcheckbox").jqxCheckBox('checked', value()); $(element).on('change', function (event) { value(event.args.checked); }); } }; ko.applyBindings(model); $("#button").click(function () { alert("Checked: " + model.checked()); }); });