[英]Can I dynamically change the 'required' binding in datetimepicker in knockout.js?
我有一个datetimepicker应该是必需的,具体取决于我的视图模型中的model.status
属性。 我怎么能收到这个?
<div class='input-group date' data-bind="dateTimePicker: model.dateClaimClosed, dateTimePickerOptions: { required: lookUpViewValue(model.status) == 'Closed' }">
<input type='text' class="form-control submittable" id="dateClaimClosed" name="dateClaimClosed" placeholder="Select date..." />
<span class="input-group-addon"><span class="glyphicon glyphicon-calendar"></span>
</div>
这是我的bindingHandler:
ko.bindingHandlers.dateTimePicker = {
init: function (element, valueAccessor, allBindingsAccessor) {
var options = {};
options.format = "DD/MM/YYYY";
$(element).datetimepicker(options);
ko.utils.registerEventHandler(element, "dp.change", function (event) {
var value = valueAccessor();
if (ko.isObservable(value)) {
if (event.date != null && !(event.date instanceof Date)) {
value(event.date != false ? event.date.toDate() : "");
} else {
value(event.date);
}
}
});
ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
var picker = $(element).data("DateTimePicker");
if (picker) {
picker.destroy();
}
});
},
update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
var options = allBindings().dateTimePickerOptions || {};
var required = options.required || false;
valueAccessor().extend({ required: required });
ko.bindingHandlers.value.update(element, valueAccessor);
var picker = $(element).data("DateTimePicker");
if (picker) {
var koDate = ko.utils.unwrapObservable(valueAccessor());
if (koDate === undefined)
koDate = null;
else
koDate = (typeof (koDate) !== 'object') ? moment(koDate) : koDate;
picker.date(koDate);
}
}
};
找到解决方案
if (required)
valueAccessor().extend({ required: required });
else
valueAccessor().rules.remove(function (item) {
return item.rule == "required";
});
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