I'm trying to use KnockoutJS with jQuery UI. I have an input element with a datepicker attached. I'm currently running knockout.debug.1.2.1.js
and it seems that the change event is never being caught by Knockout. The element looks like this:
<input type="text" class="date" data-bind="value: RedemptionExpiration"/>
I've even tried changing the valueUpdate
event type but to no avail. It seems like Chrome causes a focus
event just before it changes the value, but IE doesn't.
Is there some Knockout method that "rebinds all the bindings"? I technically only need the value changed before I send it back to the server. So I could live with that kind of workaround.
I think the problem's the datepicker's fault, but I can't figure out how to fix this.
Any ideas?
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.
The binding might look like (from my answer here):
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);
}
}
};
You would use it like:
<input data-bind="datepicker: myDate, datepickerOptions: { minDate: new Date() }" />
Sample in jsFiddle here: http://jsfiddle.net/rniemeyer/NAgNV/