Knockout DateTime Picker - 默认日期不绑定 [英] Knockout DateTime Picker - Default Date not Binding
问题描述
我正在使用这个Bootstrap DateTime选择器:
这是唯一的解决方案,循环遍历我的viewModel,然后将alld Datetimes转换为一个对象
帮助之后从@David和@Bryant我更改了代码以更新视图模型与时间对象日期。
问题是,日期只是正确地发布从DateTime选择器中选择一个日期后。所以我更改了代码,所以当初始化我更新viewModel。它现在正在工作。
这是DateTime选择器
http://eonasdan.github.io/bootstrap-datetimepicker/
我使用了以下datepicker绑定。
JSFiddle工作: http://jsfiddle.net / mdawood1991 / cL9k2sbe /
我的解决方案:
ko.bindingHandlers.datepicker = {
init:function(element,valueAccessor,allBindingsAccessor,viewModel,bindingContext){
//初始化datepicker与一些可选选项
var options = {
格式:'DD / MM / YYYY HH:mm',
defaultDate:valueAccessor()()
};
if(allBindingsAccessor()!== undefined){
if(allBindingsAccessor()。datepickerOptions!== undefined){
options.format = allBindingsAccessor()。datepickerOptions。格式!== undefined? allBindingsAccessor()。datepickerOptions.format:options.format;
}
}
$(element).datetimepicker(options);
//当用户更改日期时,更新视图模型
ko.utils.registerEventHandler(element,dp.change,function(event){
var value = valueAccessor();
if(ko.isObservable(value)){
value(event.date);
}
});
var defaultVal = $(element).val();
var value = valueAccessor();
value(moment(defaultVal,options.format));
},
update:function(element,valueAccessor,allBindingsAccessor,viewModel,bindingContext){
var thisFormat ='DD / MM / YYYY HH:mm';
if(allBindingsAccessor()!== undefined){
if(allBindingsAccessor()。datepickerOptions!== undefined){
thisFormat = allBindingsAccessor()datepickerOptions.format! == undefined? allBindingsAccessor()。datepickerOptions.format:thisFormat;
}
}
var value = valueAccessor();
var unwrapped = ko.utils.unwrapObservable(value());
if(unwrapped === undefined || unwrapped === null){
element.value = new moment(new Date());
console.log(undefined);
} else {
element.value = unwrapped.format(thisFormat);
}
}
};
I am using this Bootstrap DateTime Picker: http://eonasdan.github.io/bootstrap-datetimepicker/
I have created a Custom Binder for DateTime called datepicker:
ko.bindingHandlers.datepicker = {
init: function(element, valueAccessor, allBindingsAccessor) {
//initialize datepicker with some optional options
var options = allBindingsAccessor().datepickerOptions || {format: 'DD/MM/YYYY HH:mm'};
$(element).datetimepicker(options);
//when a user changes the date, update the view model
ko.utils.registerEventHandler(element, "dp.change", function(event) {
var value = valueAccessor();
if (ko.isObservable(value)) {
value(event.date);
}
});
},
update: function(element, valueAccessor) {
var widget = $(element).data("datepicker");
//when the view model is updated, update the widget
if (widget) {
widget.date = ko.utils.unwrapObservable(valueAccessor());
if (widget.date) {
widget.setValue();
}
}
}
};
And I My Model is in JSON, as I am converting C# dateTime to JSON I get this Date: "/Date(1427368178393)/"
<div class="col-md-4">
<div class="form-group">
<label class="control-label">Quote Date</label>
<div class='input-group date dateTimes'>
<input type="text" class="form-control" data-bind="datepicker: QuoteDateTime" />
<span class="input-group-addon"><span class="glyphicon glyphicon-calendar"></span></span>
</div>
</div>
</div>
But the Problem is that the first time the Page Loads even though the QuoteDateTime has a value it is not showing in the DateTimePicker.
Here is the JSFiddle:
https://jsfiddle.net/mdawood1991/ezv7qxbt/
I need the First Value to Show in the DateTime Picker.
EDIT
The thing is that my ViewModel has a List of Accommodations
This is the Console Log of my viewModel
I could convert every dateTime to a moment as you suggester, but then I shouldn't use the knockout Mapping Plugin: http://knockoutjs.com/documentation/plugins-mapping.html
Is this the only solution to loop through my viewModel and then converting alld Datetimes to a moment object
After help From @David and @Bryant I changed my code to update viewModel with moment object date.
The Problem was that the Date was only posting back correctly after selecting a Date from the DateTime Picker. So I changed code so when Initialized I update the viewModel. And it is working now.
This is the DateTime Picker
http://eonasdan.github.io/bootstrap-datetimepicker/
I used the following datepicker binding.
JSFiddle Working: http://jsfiddle.net/mdawood1991/cL9k2sbe/
My Solution:
ko.bindingHandlers.datepicker = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
//initialize datepicker with some optional options
var options = {
format: 'DD/MM/YYYY HH:mm',
defaultDate: valueAccessor()()
};
if (allBindingsAccessor() !== undefined) {
if (allBindingsAccessor().datepickerOptions !== undefined) {
options.format = allBindingsAccessor().datepickerOptions.format !== undefined ? allBindingsAccessor().datepickerOptions.format : options.format;
}
}
$(element).datetimepicker(options);
//when a user changes the date, update the view model
ko.utils.registerEventHandler(element, "dp.change", function (event) {
var value = valueAccessor();
if (ko.isObservable(value)) {
value(event.date);
}
});
var defaultVal = $(element).val();
var value = valueAccessor();
value(moment(defaultVal, options.format));
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var thisFormat = 'DD/MM/YYYY HH:mm';
if (allBindingsAccessor() !== undefined) {
if (allBindingsAccessor().datepickerOptions !== undefined) {
thisFormat = allBindingsAccessor().datepickerOptions.format !== undefined ? allBindingsAccessor().datepickerOptions.format : thisFormat;
}
}
var value = valueAccessor();
var unwrapped = ko.utils.unwrapObservable(value());
if (unwrapped === undefined || unwrapped === null) {
element.value = new moment(new Date());
console.log("undefined");
} else {
element.value = unwrapped.format(thisFormat);
}
}
};
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