Knockout.js如何绑定到子属性 [英] Knockout.js how do i bind to a sub property

问题描述

我知道如何绑定到属性，但是如何绑定到类似的属性: 父母/孩子

I know how to bind to a property, but how do i bind to a property like: Parent.Child

使用Knockout JS.com上的hello world示例: HTML:

Using the hello world example on Knockout JS.com: Html:

<p>First name: <input data-bind="value: firstName" /></p>
<p>Last name: <input data-bind="value: lastName" /></p>
<h2>Hello, <span data-bind="text: fullName"> </span>!</h2>
<h2>ChildProperty: <span data-bind="text: parentProperty.childProperty"> </span>!</h2>

JavaScript:

Javascript:

var ViewModel = function(first, last) {
this.firstName = ko.observable(first);
this.lastName = ko.observable(last);
this.parentProperty = ko.observable(
    {
        childProperty: "I am a child Property"
    });

this.fullName = ko.computed(function() {
    // Knockout tracks dependencies automatically. It knows that fullName depends on firstName      and lastName, because these get called when evaluating fullName.
        return this.firstName() + " " + this.lastName();
    }, this);
};

ko.applyBindings(new ViewModel("Planet", "Earth"));

我想创建一个与childProperty的绑定.

I would like to create a binding to the childProperty.

我在此处创建了 jsfiddle

谢谢

推荐答案

是如此接近！

你想要

<span data-bind="text: parentProperty().childProperty"> </span>

您更新的小提琴 http://jsfiddle.net/szk2e/2/

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