日期选择器中未设置 minDate

Question

在我看来，这就是我使用日期选择器的方式：

<input type="text" class="form-control datepicker" name="ChartStartDate1" id="dailySummaryDt" data-bind="datePicker: targetDate, minDate: viewModel.datePickerMinDate()" />
<span id="temp" data-bind="text:viewModel.datePickerMinDate()"></span>

带有 span 的最后一行完美运行。我创建该跨度只是为了检查我的模型是否具有正确的值。但是日期选择器没有选择那个值，我不确定为什么。

未设置日期选择器的 minDate；换句话说，我无法为日期选择器设置最短日期。请注意以下操作正确：

minDate: new Date()  or
minDate:new Date('01/10/2015')

这不起作用。如果我尝试调试我的绑定处理程序，在所有这些情况下，日期的值要么未定义要么无效：

minDate: new Date(viewModel.datePickerMinDate())  OR
minDate: viewModel.datePickerMinDate()  OR
minDate: viewModel.datePickerMinDate

这是我的绑定处理程序的代码

ko.bindingHandlers.datePicker = {
    init: function (element, valueAccessor, allBindings) {
        var minDate = moment(allBindings.get('minDate') || ''),
            maxDate = moment(allBindings.get('maxDate') || ''),
            options = {
                minDate: minDate.isValid() ? minDate.toDate() : undefined,
                maxDate: maxDate.isValid() ? maxDate.toDate() : undefined,
                onClose: function () { if ($.fn.valid) $(this).valid(); },
                dateFormat: allBindings.get('format') || GGS.dateFormats.pickerDateFormat
            },
            dp = $(element).datepicker(options);
        console.log('minDate ' + minDate + '  ' + moment.utc($("#ChartStartDate").val()).format('MM/DD/YYYY'));
        dp.change(function () {
            var observable = valueAccessor(),
                unwrapped = ko.unwrap(observable)
                current = unwrapped ? moment.utc(unwrapped) : null,
                raw = dp.datepicker("getDate"),
                localValue = raw ? moment(raw) : null, //n.b. not UTC; stupid jQuery UI
                value = localValue ? moment.utc([localValue.year(), localValue.month(), localValue.date()]) : null //extract the date part to a UTC date
                if (!value || (!current || !current.isSame(value, 'day'))) {
                    console.log('value = ' + value.toDate());
                     observable(value ? value.toDate() : value);
                }
        });
    },
    update: function (element, valueAccessor) {
        var dp = $(element);
        var observable = valueAccessor(),
            unwrapped = ko.unwrap(observable),
            value = unwrapped ? moment.utc(unwrapped) : null,
            localValue = value ? moment([value.year(), value.month(), value.date()]) : null //make sure that jQuery UI shows the date we expect, rather than trying to convert to local time
        ;
        dp.datepicker("setDate", localValue ? localValue.toDate() : localValue);
        dp.blur();        
    },
}

Answer 1

好吧，正如评论中提到的，你只需要这样做

查看：

<input type="text" class="form-control datepicker" data-bind="datePicker:targetDate, minDate:datePickerMinDate()" />
<span id="temp" data-bind="text:targetDate"></span>

ViewModel:

var ViewModel = function () {
    var self = this;
    self.targetDate = ko.observable('01/10/2015');
    self.datePickerMinDate = ko.observable('01/10/2015');
};

//In bindingHandler update 

 update: function (element, valueAccessor) {

        var dp = $(element);
        var observable = valueAccessor(),
            unwrapped = ko.unwrap(observable)

          //here you have to format the Date before setting 
            $(element).datepicker("setDate", unwrapped);
        dp.blur();

    }

工作fiddle供参考here

日期选择器中未设置 minDate

minDate not being set in date picker

knockout.js

bootstrap-datepicker