使用Knockout.js如何将Date属性绑定到HTML5日期选择器？ [英] Using Knockout.js how do bind a Date property to a HTML5 date picker?

问题描述

（目前仅适用于Chrome，因为大多数浏览器尚未为输入类型=日期实现日期选择器）

在下面的示例中，MyDate以具有当前日期的Date对象开始，但日期输入（它希望其格式为格式为YYYY / MM / DD的字符串）不会选择此项。

In the following example MyDate starts out as a Date object with the current date, but this isn't picked up by the date input (which expects its format to be a string in format YYYY/MM/DD).

一旦你在选择器中选择了一个日期，MyDate就会变成上面格式的字符串。

Once you've picked a date in the picker then MyDate becomes a string in format above.

你怎么能绑定这样，MyDate保持javascript日期并被输入控件正确解释？

How can you bind this so MyDate stays a javascript Date and is interpreted by the input control correctly?

参见 http://jsfiddle.net/LLkC4/3/： -

See See http://jsfiddle.net/LLkC4/3/ :-

<input data-bind="value : MyDate" type="date">
<hr>   
<span data-bind="html: log" />

<script>
var viewModel = {    
    MyDate : ko.observable(new Date()),
    log : ko.observable(""),
    logDate : function () { 
            this.log(this.log() + this.MyDate() + " : " +
                     typeof(this.MyDate()) + "<br>");
                     }
};

viewModel.MyDate.subscribe(function (date) {    
    viewModel.logDate();    
});

ko.applyBindings(viewModel);

viewModel.logDate()
</script>

推荐答案

虽然@amakhrov的回答会起作用（甚至可以如果使用像@Stijn那样的可写可计算的observable，那就更好了。我决定使用自定义绑定来做到这一点。

While @amakhrov answer will work (and would be even better if used writeable computed observable like sujested by @Stijn) I decided to do this using Custom Bindings.

这样做的主要优点是可重用性 - 我只需要使用 data-bind =datePicker：MyDate想要将其联系起来。我还可以修改输入元素的其他属性，这样如果绑定到复杂的jQuery（和其他）控件，这可能非常有用。

The main advantage of doing this is reusability - I just have to use data-bind="datePicker : MyDate" whereever I want to tie this in. I can also modify other properties of the input element so this could be really useful if binding to complex jQuery (and other) controls.

（请阅读此处了解更多关于3个选项的赞成/反对意见做这种事情）

(Read here for more pro/cons about the 3 choices to do this sort of thing)

HTML

<input data-bind="datePicker : MyDate" type="date">

JS

ko.bindingHandlers.datePicker = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel) {                    
        // Register change callbacks to update the model
        // if the control changes.       
        ko.utils.registerEventHandler(element, "change", function () {            
            var value = valueAccessor();
            value(new Date(element.value));            
        });
    },
    // Update the control whenever the view model changes
    update: function (element, valueAccessor, allBindingsAccessor, viewModel) {
        var value =  valueAccessor();        
        element.value = value().toISOString();
    }
};

var viewModel = {    
    MyDate : ko.observable(new Date())
};     

ko.applyBindings(viewModel);

请参阅 http ：//jsfiddle.net/LLkC4/5/

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