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javascript-使用基因敲除.js的自定义绑定处理程序中的显式设置值绑定处理程序

(javascript - Explicity set value binding handler inside a custom binding handler with knockout.js)

发布于 2020-12-18 23:13:28

我想使 Observable FirstName到像value元素上的默认绑定。由于某种原因,ko.bindingHandlers.value.init下面的内容不起作用。当我更新文本框时,它不会在属性中反映出来,但是,如果我value在元素上手动设置绑定,它将很好地工作。

的HTML

<td class="text-center text-nowrap">
    @Html.TextBoxFor(q => q.Number, new { data_bind = "dynamicFormList: { observable: true, value: FirstName }" })
</td>

处理程序

ko.bindingHandlers.dynamicFormList = {
        init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
            var values = ko.utils.unwrapObservable(valueAccessor());
            if (values.observable && values.value) {
                ko.bindingHandlers.value.init(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
            }
        }
}
Questioner
Mike Flynn
Viewed
0
Brother Woodrow 2020-12-19 20:51:40

你不能像这样调用绑定处理程序,但是applyBindingsToNode可以使用一种方法(由于某种原因未记录)可以使用:

ko.bindingHandlers.dynamicFormList = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
        var values = ko.utils.unwrapObservable(valueAccessor());
        if (values.observable && values.value) {
            ko.applyBindingsToNode(
                element,
                { value: values.value }
            );
        }
    }
}

小提琴:https : //jsfiddle.net/thebluenile/12agb3x9/