validationOptions不使用自定义bindingHandlers

Question

我正在使用带有Knockout的durandal/breeze.

我正在努力验证我的输入ko.validation.

这是一个经典:

<input type="text" data-bind="value: myDate, validationOptions: { errorElementClass: 'input-validation-error'}" />

.input-validation-error {
    background-color: #c75b55 !important;
}

这个工作得很好:当验证失败时,输入文本框标记为红色.

现在我想使用bindingHandlers代替'简单' value绑定:

<input type="text" data-bind="dateRW: myDate, validationOptions: { errorElementClass: 'input-validation-error'}" />

ko.bindingHandlers.dateRW = {
    //dateRW --> the 'read-write' version used both for displaying & updating dates
    init: function (element, valueAccessor, allBindingsAccessor) {
        var observable = valueAccessor();            
        //handle the field changing
        ko.utils.registerEventHandler(element, "change", function () {
            var value = $(element).val();
            var dateFormatted = moment.utc(value, "DD/MM/YYYY");
            //if (dateFormatted.isValid())
            if (dateFormatted)
                observable(dateFormatted.toDate())
            else 
                observable(null);
        });
    },
    update: function (element, valueAccessor, allBindingsAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor());
        var date = (typeof value !== 'undefined') ? moment.utc(value) : null;
        var dateFormatted = (date != null) ? date.format('DD/MM/YYYY') : '';
        $(element).val(dateFormatted);            
    }
};

有了这个实现,验证工作,我的意思ko.validation.group是运作良好

var validationErrorsCount = ko.computed(function() {
    if (typeof itinerary() == 'undefined') return;
    var validationErrors = ko.validation.group(itinerary());
    return validationErrors().length;
});

但输入文本框不再标记为红色.似乎'validationOptions'仅适用于值绑定.

有什么方法让我的验证工作？

谢谢.

Answer 1

验证框架具有值绑定的钩子,您需要调用

ko.validation.makeBindingHandlerValidatable("dateRW");

编辑:它不是未定义的 https://jsfiddle.net/it3xl/n7aqjor9/