knockoutjs databind with jquery controls

http://stackoverflow.com/questions/6399078/knockoutjs-databind-with-jquery-controls

by rniemeyer

HTML

<script src="http://knockoutjs.com/downloads/knockout-2.2.1.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.11/themes/base/jquery-ui.css">
<script src="http://trentrichardson.com/examples/timepicker/jquery-ui-timepicker-addon.js"></script>
<input data-bind="datetimepicker: myDate" />

<hr />

<button data-bind="click: setToCurrentDate">Set To Current Date</button>

<hr />

<div data-bind="text: myDate"></div>

CSS

td, th { padding: 5px; border: solid 1px black; }
th { color: #666; }
a { font-size: .75em; }
.ui-timepicker-div .ui-widget-header { margin-bottom: 8px; }
.ui-timepicker-div dl { text-align: left; }
.ui-timepicker-div dl dt { height: 25px; margin-bottom: -25px; }
.ui-timepicker-div dl dd { margin: 0 10px 10px 65px; }
.ui-timepicker-div td { font-size: 90%; }
.ui-tpicker-grid-label { background: none; border: none; margin: 0; padding: 0; }

JavaScript

ko.bindingHandlers.datetimepicker = {
    init: function(element, valueAccessor, allBindingsAccessor) {
        //initialize datepicker with some optional options
        var options = allBindingsAccessor().datetimepickerOptions || {};
        $(element).datetimepicker(options);

        //handle the field changing
        ko.utils.registerEventHandler(element, "change", function() {
            var observable = valueAccessor();
            observable($(element).datetimepicker("getDate"));
        });

        //handle disposal (if KO removes by the template binding)
        ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
            $(element).datetimepicker("destroy");
        });

    },
    update: function(element, valueAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor()),
            current = $(element).datetimepicker("getDate");

        if (value - current !== 0) {
            console.log("setting", value);
            $(element).datetimepicker("setDate", value); 
            console.log("just set", $(element).datetimepicker("getDate"));            
        }
    }
};

var viewModel = {
    myDate: ko.observable(new Date(2012, 8, 1, 4, 30)),
    setToCurrentDate: function() {
        this.myDate(new Date());
    }
};

ko.applyBindings(viewModel);