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    <p>I think that for the jQuery UI datepicker it is preferable to use a custom binding that will read/write with Date objects using the APIs provided by the datepicker.</p> <p>The binding might look like (from my answer <a href="https://stackoverflow.com/questions/6399078/knockoutjs-databind-with-jquery-controls/6400701#6400701">here</a>):</p> <pre><code>ko.bindingHandlers.datepicker = { init: function(element, valueAccessor, allBindingsAccessor) { //initialize datepicker with some optional options var options = allBindingsAccessor().datepickerOptions || {}, $el = $(element); $el.datepicker(options); //handle the field changing by registering datepicker's changeDate event ko.utils.registerEventHandler(element, "changeDate", function () { var observable = valueAccessor(); observable($el.datepicker("getDate")); }); //handle disposal (if KO removes by the template binding) ko.utils.domNodeDisposal.addDisposeCallback(element, function() { $el.datepicker("destroy"); }); }, update: function(element, valueAccessor) { var value = ko.utils.unwrapObservable(valueAccessor()), $el = $(element); //handle date data coming via json from Microsoft if (String(value).indexOf('/Date(') == 0) { value = new Date(parseInt(value.replace(/\/Date\((.*?)\)\//gi, "$1"))); } var current = $el.datepicker("getDate"); if (value - current !== 0) { $el.datepicker("setDate", value); } } }; </code></pre> <p>You would use it like:</p> <pre><code>&lt;input data-bind="datepicker: myDate, datepickerOptions: { minDate: new Date() }" /&gt; </code></pre> <p>Sample in jsFiddle here: <a href="http://jsfiddle.net/rniemeyer/NAgNV/" rel="noreferrer">http://jsfiddle.net/rniemeyer/NAgNV/</a></p>
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    1. POjQuery UI datepicker change event not caught by KnockoutJS
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    1. COWhat I love is that you didn't cut corners in this binder, like with the dispose callback. A sound example to follow on the road to KnockoutJS mastery!
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    2. COAnd what about the datepicker binded to an element that is dinamically created... i mean, the datepicker with a live handler.
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    3. COI love this answer, however, I can't get this to work well with Eric Barnard's custom validator extenders. github.com/ericmbarnard/Knockout-Validation . Once you add the additional fix mentioned here: https://github.com/ericmbarnard/Knockout-Validation/issues/69 everything works great, except any invalid input will return today's date to the validators. Example, I enter 1/1/1/1/1, the date validator will log today's date as what is being validated.
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